merge with base repo
This commit is contained in:
Ahmed Tawila
@@ -0,0 +1,51 @@
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package com.baeldung.comparable;
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public class Player implements Comparable<Player> {
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private int ranking;
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private String name;
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private int age;
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public Player(int ranking, String name, int age) {
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this.ranking = ranking;
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this.name = name;
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this.age = age;
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}
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public int getRanking() {
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return ranking;
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}
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public void setRanking(int ranking) {
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this.ranking = ranking;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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@Override
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public String toString() {
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return this.name;
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}
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@Override
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public int compareTo(Player otherPlayer) {
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return (this.getRanking() - otherPlayer.getRanking());
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}
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}
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@@ -0,0 +1,25 @@
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package com.baeldung.comparable;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class PlayerSorter {
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public static void main(String[] args) {
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List<Player> footballTeam = new ArrayList<Player>();
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Player player1 = new Player(59, "John", 20);
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Player player2 = new Player(67, "Roger", 22);
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Player player3 = new Player(45, "Steven", 24);
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footballTeam.add(player1);
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footballTeam.add(player2);
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footballTeam.add(player3);
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System.out.println("Before Sorting : " + footballTeam);
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Collections.sort(footballTeam);
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System.out.println("After Sorting : " + footballTeam);
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}
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}
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@@ -0,0 +1,46 @@
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package com.baeldung.comparator;
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public class Player {
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private int ranking;
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private String name;
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private int age;
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public Player(int ranking, String name, int age) {
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this.ranking = ranking;
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this.name = name;
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this.age = age;
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}
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public int getRanking() {
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return ranking;
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}
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public void setRanking(int ranking) {
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this.ranking = ranking;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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@Override
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public String toString() {
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return this.name;
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}
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}
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@@ -0,0 +1,12 @@
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package com.baeldung.comparator;
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import java.util.Comparator;
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public class PlayerAgeComparator implements Comparator<Player> {
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@Override
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public int compare(Player firstPlayer, Player secondPlayer) {
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return (firstPlayer.getAge() - secondPlayer.getAge());
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}
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}
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@@ -0,0 +1,27 @@
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package com.baeldung.comparator;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class PlayerAgeSorter {
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public static void main(String[] args) {
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List<Player> footballTeam = new ArrayList<Player>();
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Player player1 = new Player(59, "John", 22);
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Player player2 = new Player(67, "Roger", 20);
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Player player3 = new Player(45, "Steven", 24);
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footballTeam.add(player1);
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footballTeam.add(player2);
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footballTeam.add(player3);
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System.out.println("Before Sorting : " + footballTeam);
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//Instance of PlayerAgeComparator
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PlayerAgeComparator playerComparator = new PlayerAgeComparator();
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Collections.sort(footballTeam, playerComparator);
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System.out.println("After Sorting by age : " + footballTeam);
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}
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}
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@@ -0,0 +1,12 @@
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package com.baeldung.comparator;
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import java.util.Comparator;
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public class PlayerRankingComparator implements Comparator<Player> {
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@Override
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public int compare(Player firstPlayer, Player secondPlayer) {
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return (firstPlayer.getRanking() - secondPlayer.getRanking());
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}
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}
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@@ -0,0 +1,27 @@
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package com.baeldung.comparator;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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public class PlayerRankingSorter {
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public static void main(String[] args) {
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List<Player> footballTeam = new ArrayList<Player>();
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Player player1 = new Player(59, "John", 22);
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Player player2 = new Player(67, "Roger", 20);
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Player player3 = new Player(45, "Steven", 40);
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footballTeam.add(player1);
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footballTeam.add(player2);
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footballTeam.add(player3);
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System.out.println("Before Sorting : " + footballTeam);
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//Instance of PlayerRankingComparator
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PlayerRankingComparator playerComparator = new PlayerRankingComparator();
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Collections.sort(footballTeam, playerComparator);
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System.out.println("After Sorting by ranking : " + footballTeam);
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}
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}
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+2
-2
@@ -11,7 +11,7 @@ public class PolygonFactory {
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if(numberOfSides == 5) {
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return new Pentagon();
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}
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if(numberOfSides == 4) {
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if(numberOfSides == 7) {
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return new Heptagon();
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}
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else if(numberOfSides == 8) {
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@@ -19,4 +19,4 @@ public class PolygonFactory {
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}
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return null;
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}
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}
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}
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@@ -1,9 +0,0 @@
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package com.baeldung.javac;
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import java.lang.annotation.*;
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@Documented
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@Retention(RetentionPolicy.CLASS)
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@Target({ElementType.PARAMETER})
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public @interface Positive {
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}
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@@ -1,123 +0,0 @@
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package com.baeldung.javac;
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import com.sun.source.tree.MethodTree;
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import com.sun.source.tree.VariableTree;
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import com.sun.source.util.*;
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import com.sun.tools.javac.api.BasicJavacTask;
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import com.sun.tools.javac.code.TypeTag;
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import com.sun.tools.javac.tree.JCTree;
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import com.sun.tools.javac.tree.TreeMaker;
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import com.sun.tools.javac.util.Context;
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import com.sun.tools.javac.util.Name;
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import com.sun.tools.javac.util.Names;
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import javax.tools.JavaCompiler;
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import java.util.*;
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import java.util.stream.Collectors;
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import static com.sun.tools.javac.util.List.nil;
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/**
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* A {@link JavaCompiler javac} plugin which inserts {@code >= 0} checks into resulting {@code *.class} files
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* for numeric method parameters marked by {@link Positive}
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*/
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public class SampleJavacPlugin implements Plugin {
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public static final String NAME = "MyPlugin";
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private static Set<String> TARGET_TYPES = new HashSet<>(Arrays.asList(
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// Use only primitive types for simplicity
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byte.class.getName(), short.class.getName(), char.class.getName(),
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int.class.getName(), long.class.getName(), float.class.getName(), double.class.getName()));
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@Override
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public String getName() {
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return NAME;
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}
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@Override
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public void init(JavacTask task, String... args) {
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Context context = ((BasicJavacTask) task).getContext();
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task.addTaskListener(new TaskListener() {
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@Override
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public void started(TaskEvent e) {
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}
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@Override
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public void finished(TaskEvent e) {
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if (e.getKind() != TaskEvent.Kind.PARSE) {
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return;
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}
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e.getCompilationUnit()
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.accept(new TreeScanner<Void, Void>() {
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@Override
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public Void visitMethod(MethodTree method, Void v) {
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List<VariableTree> parametersToInstrument = method.getParameters()
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.stream()
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.filter(SampleJavacPlugin.this::shouldInstrument)
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.collect(Collectors.toList());
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if (!parametersToInstrument.isEmpty()) {
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// There is a possible case that more than one argument is marked by @Positive,
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// as the checks are added to the method's body beginning, we process parameters RTL
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// to ensure correct order.
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Collections.reverse(parametersToInstrument);
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parametersToInstrument.forEach(p -> addCheck(method, p, context));
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}
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// There is a possible case that there is a nested class declared in a method's body,
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// hence, we want to proceed with method body AST as well.
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return super.visitMethod(method, v);
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}
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}, null);
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}
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});
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}
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private boolean shouldInstrument(VariableTree parameter) {
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return TARGET_TYPES.contains(parameter.getType().toString())
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&& parameter.getModifiers().getAnnotations()
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.stream()
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.anyMatch(a -> Positive.class.getSimpleName().equals(a.getAnnotationType().toString()));
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}
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private void addCheck(MethodTree method, VariableTree parameter, Context context) {
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JCTree.JCIf check = createCheck(parameter, context);
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JCTree.JCBlock body = (JCTree.JCBlock) method.getBody();
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body.stats = body.stats.prepend(check);
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}
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private static JCTree.JCIf createCheck(VariableTree parameter, Context context) {
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TreeMaker factory = TreeMaker.instance(context);
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Names symbolsTable = Names.instance(context);
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return factory.at(((JCTree) parameter).pos)
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.If(factory.Parens(createIfCondition(factory, symbolsTable, parameter)),
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createIfBlock(factory, symbolsTable, parameter),
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null);
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}
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private static JCTree.JCBinary createIfCondition(TreeMaker factory, Names symbolsTable, VariableTree parameter) {
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Name parameterId = symbolsTable.fromString(parameter.getName().toString());
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return factory.Binary(JCTree.Tag.LE,
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factory.Ident(parameterId),
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factory.Literal(TypeTag.INT, 0));
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}
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private static JCTree.JCBlock createIfBlock(TreeMaker factory, Names symbolsTable, VariableTree parameter) {
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String parameterName = parameter.getName().toString();
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Name parameterId = symbolsTable.fromString(parameterName);
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String errorMessagePrefix = String.format("Argument '%s' of type %s is marked by @%s but got '",
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parameterName, parameter.getType(), Positive.class.getSimpleName());
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String errorMessageSuffix = "' for it";
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|
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return factory.Block(0, com.sun.tools.javac.util.List.of(
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factory.Throw(
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factory.NewClass(null, nil(),
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factory.Ident(symbolsTable.fromString(IllegalArgumentException.class.getSimpleName())),
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com.sun.tools.javac.util.List.of(factory.Binary(JCTree.Tag.PLUS,
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factory.Binary(JCTree.Tag.PLUS, factory.Literal(TypeTag.CLASS, errorMessagePrefix),
|
||||
factory.Ident(parameterId)),
|
||||
factory.Literal(TypeTag.CLASS, errorMessageSuffix))), null))));
|
||||
}
|
||||
|
||||
}
|
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@@ -0,0 +1,43 @@
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||||
package com.baeldung.loops;
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||||
|
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public class LoopsInJava {
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|
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public int[] simple_for_loop() {
|
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int[] arr = new int[5];
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||||
for (int i = 0; i < 5; i++) {
|
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arr[i] = i;
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System.out.println("Simple for loop: i - " + i);
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}
|
||||
return arr;
|
||||
}
|
||||
|
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public int[] enhanced_for_each_loop() {
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||||
int[] intArr = { 0, 1, 2, 3, 4 };
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||||
int[] arr = new int[5];
|
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for (int num : intArr) {
|
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arr[num] = num;
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System.out.println("Enhanced for-each loop: i - " + num);
|
||||
}
|
||||
return arr;
|
||||
}
|
||||
|
||||
public int[] while_loop() {
|
||||
int i = 0;
|
||||
int[] arr = new int[5];
|
||||
while (i < 5) {
|
||||
arr[i] = i;
|
||||
System.out.println("While loop: i - " + i++);
|
||||
}
|
||||
return arr;
|
||||
}
|
||||
|
||||
public int[] do_while_loop() {
|
||||
int i = 0;
|
||||
int[] arr = new int[5];
|
||||
do {
|
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arr[i] = i;
|
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System.out.println("Do-While loop: i - " + i++);
|
||||
} while (i < 5);
|
||||
return arr;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,38 @@
|
||||
package com.baeldung.polymorphism;
|
||||
|
||||
import java.awt.image.BufferedImage;
|
||||
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
public class FileManager {
|
||||
|
||||
final static Logger logger = LoggerFactory.getLogger(FileManager.class);
|
||||
|
||||
public static void main(String[] args) {
|
||||
GenericFile file1 = new TextFile("SampleTextFile", "This is a sample text content", "v1.0.0");
|
||||
logger.info("File Info: \n" + file1.getFileInfo() + "\n");
|
||||
ImageFile imageFile = new ImageFile("SampleImageFile", 200, 100, new BufferedImage(100, 200, BufferedImage.TYPE_INT_RGB).toString()
|
||||
.getBytes(), "v1.0.0");
|
||||
logger.info("File Info: \n" + imageFile.getFileInfo());
|
||||
}
|
||||
|
||||
public static ImageFile createImageFile(String name, int height, int width, byte[] content, String version) {
|
||||
ImageFile imageFile = new ImageFile(name, height, width, content, version);
|
||||
logger.info("File 2 Info: \n" + imageFile.getFileInfo());
|
||||
return imageFile;
|
||||
}
|
||||
|
||||
public static GenericFile createTextFile(String name, String content, String version) {
|
||||
GenericFile file1 = new TextFile(name, content, version);
|
||||
logger.info("File 1 Info: \n" + file1.getFileInfo() + "\n");
|
||||
return file1;
|
||||
}
|
||||
|
||||
public static TextFile createTextFile2(String name, String content, String version) {
|
||||
TextFile file1 = new TextFile(name, content, version);
|
||||
logger.info("File 1 Info: \n" + file1.getFileInfo() + "\n");
|
||||
return file1;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,63 @@
|
||||
package com.baeldung.polymorphism;
|
||||
|
||||
import java.util.Date;
|
||||
|
||||
public class GenericFile {
|
||||
private String name;
|
||||
private String extension;
|
||||
private Date dateCreated;
|
||||
private String version;
|
||||
private byte[] content;
|
||||
|
||||
public GenericFile() {
|
||||
this.setDateCreated(new Date());
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public String getExtension() {
|
||||
return extension;
|
||||
}
|
||||
|
||||
public void setExtension(String extension) {
|
||||
this.extension = extension;
|
||||
}
|
||||
|
||||
public Date getDateCreated() {
|
||||
return dateCreated;
|
||||
}
|
||||
|
||||
public void setDateCreated(Date dateCreated) {
|
||||
this.dateCreated = dateCreated;
|
||||
}
|
||||
|
||||
public String getVersion() {
|
||||
return version;
|
||||
}
|
||||
|
||||
public void setVersion(String version) {
|
||||
this.version = version;
|
||||
}
|
||||
|
||||
public byte[] getContent() {
|
||||
return content;
|
||||
}
|
||||
|
||||
public void setContent(byte[] content) {
|
||||
this.content = content;
|
||||
}
|
||||
|
||||
public String getFileInfo() {
|
||||
return "File Name: " + this.getName() + "\n" + "Extension: " + this.getExtension() + "\n" + "Date Created: " + this.getDateCreated() + "\n" + "Version: " + this.getVersion() + "\n";
|
||||
}
|
||||
|
||||
public Object read() {
|
||||
return content;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,41 @@
|
||||
package com.baeldung.polymorphism;
|
||||
|
||||
public class ImageFile extends GenericFile {
|
||||
private int height;
|
||||
private int width;
|
||||
|
||||
public ImageFile(String name, int height, int width, byte[] content, String version) {
|
||||
this.setHeight(height);
|
||||
this.setWidth(width);
|
||||
this.setContent(content);
|
||||
this.setName(name);
|
||||
this.setVersion(version);
|
||||
this.setExtension(".jpg");
|
||||
}
|
||||
|
||||
public int getHeight() {
|
||||
return height;
|
||||
}
|
||||
|
||||
public void setHeight(int height) {
|
||||
this.height = height;
|
||||
}
|
||||
|
||||
public int getWidth() {
|
||||
return width;
|
||||
}
|
||||
|
||||
public void setWidth(int width) {
|
||||
this.width = width;
|
||||
}
|
||||
|
||||
public String getFileInfo() {
|
||||
return super.getFileInfo() + "Height: " + this.getHeight() + "\n" + "Width: " + this.getWidth();
|
||||
}
|
||||
|
||||
public String read() {
|
||||
return this.getContent()
|
||||
.toString();
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,44 @@
|
||||
package com.baeldung.polymorphism;
|
||||
|
||||
public class TextFile extends GenericFile {
|
||||
private int wordCount;
|
||||
|
||||
public TextFile(String name, String content, String version) {
|
||||
String[] words = content.split(" ");
|
||||
this.setWordCount(words.length > 0 ? words.length : 1);
|
||||
this.setContent(content.getBytes());
|
||||
this.setName(name);
|
||||
this.setVersion(version);
|
||||
this.setExtension(".txt");
|
||||
}
|
||||
|
||||
public int getWordCount() {
|
||||
return wordCount;
|
||||
}
|
||||
|
||||
public void setWordCount(int wordCount) {
|
||||
this.wordCount = wordCount;
|
||||
}
|
||||
|
||||
public String getFileInfo() {
|
||||
return super.getFileInfo() + "Word Count: " + wordCount;
|
||||
}
|
||||
|
||||
public String read() {
|
||||
return this.getContent()
|
||||
.toString();
|
||||
}
|
||||
|
||||
public String read(int limit) {
|
||||
return this.getContent()
|
||||
.toString()
|
||||
.substring(0, limit);
|
||||
}
|
||||
|
||||
public String read(int start, int stop) {
|
||||
return this.getContent()
|
||||
.toString()
|
||||
.substring(start, stop);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,3 +1,3 @@
|
||||
UK
|
||||
US
|
||||
Germany
|
||||
Germany
|
||||
@@ -0,0 +1,50 @@
|
||||
package com.baeldung.arraydeque;
|
||||
|
||||
import java.util.ArrayDeque;
|
||||
import java.util.Deque;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
import org.junit.Test;
|
||||
|
||||
public class ArrayDequeTest {
|
||||
|
||||
@Test
|
||||
public void whenOffer_addsAtLast() {
|
||||
final Deque<String> deque = new ArrayDeque<>();
|
||||
|
||||
deque.offer("first");
|
||||
deque.offer("second");
|
||||
|
||||
assertEquals("second", deque.getLast());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenPoll_removesFirst() {
|
||||
final Deque<String> deque = new ArrayDeque<>();
|
||||
|
||||
deque.offer("first");
|
||||
deque.offer("second");
|
||||
|
||||
assertEquals("first", deque.poll());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenPush_addsAtFirst() {
|
||||
final Deque<String> deque = new ArrayDeque<>();
|
||||
|
||||
deque.push("first");
|
||||
deque.push("second");
|
||||
|
||||
assertEquals("second", deque.getFirst());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenPop_removesLast() {
|
||||
final Deque<String> deque = new ArrayDeque<>();
|
||||
|
||||
deque.push("first");
|
||||
deque.push("second");
|
||||
|
||||
assertEquals("second", deque.pop());
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,29 @@
|
||||
package com.baeldung.comparable;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
public class ComparableUnitTest {
|
||||
|
||||
@Test
|
||||
public void whenUsingComparable_thenSortedList() {
|
||||
List<Player> footballTeam = new ArrayList<Player>();
|
||||
Player player1 = new Player(59, "John", 20);
|
||||
Player player2 = new Player(67, "Roger", 22);
|
||||
Player player3 = new Player(45, "Steven", 24);
|
||||
footballTeam.add(player1);
|
||||
footballTeam.add(player2);
|
||||
footballTeam.add(player3);
|
||||
Collections.sort(footballTeam);
|
||||
assertEquals(footballTeam.get(0)
|
||||
.getName(), "Steven");
|
||||
assertEquals(footballTeam.get(2)
|
||||
.getRanking(), 67);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,47 @@
|
||||
package com.baeldung.comparator;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
public class ComparatorUnitTest {
|
||||
|
||||
List<Player> footballTeam;
|
||||
|
||||
@Before
|
||||
public void setUp() {
|
||||
footballTeam = new ArrayList<Player>();
|
||||
Player player1 = new Player(59, "John", 20);
|
||||
Player player2 = new Player(67, "Roger", 22);
|
||||
Player player3 = new Player(45, "Steven", 24);
|
||||
footballTeam.add(player1);
|
||||
footballTeam.add(player2);
|
||||
footballTeam.add(player3);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenUsingRankingComparator_thenSortedList() {
|
||||
PlayerRankingComparator playerComparator = new PlayerRankingComparator();
|
||||
Collections.sort(footballTeam, playerComparator);
|
||||
assertEquals(footballTeam.get(0)
|
||||
.getName(), "Steven");
|
||||
assertEquals(footballTeam.get(2)
|
||||
.getRanking(), 67);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenUsingAgeComparator_thenSortedList() {
|
||||
PlayerAgeComparator playerComparator = new PlayerAgeComparator();
|
||||
Collections.sort(footballTeam, playerComparator);
|
||||
assertEquals(footballTeam.get(0)
|
||||
.getName(), "John");
|
||||
assertEquals(footballTeam.get(2)
|
||||
.getRanking(), 45);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,68 @@
|
||||
package com.baeldung.comparator;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collections;
|
||||
import java.util.Comparator;
|
||||
import java.util.List;
|
||||
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
public class Java8ComparatorUnitTest {
|
||||
|
||||
List<Player> footballTeam;
|
||||
|
||||
@Before
|
||||
public void setUp() {
|
||||
footballTeam = new ArrayList<Player>();
|
||||
Player player1 = new Player(59, "John", 22);
|
||||
Player player2 = new Player(67, "Roger", 20);
|
||||
Player player3 = new Player(45, "Steven", 24);
|
||||
footballTeam.add(player1);
|
||||
footballTeam.add(player2);
|
||||
footballTeam.add(player3);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenComparing_UsingLambda_thenSorted() {
|
||||
System.out.println("************** Java 8 Comaparator **************");
|
||||
Comparator<Player> byRanking = (Player player1, Player player2) -> player1.getRanking() - player2.getRanking();
|
||||
|
||||
System.out.println("Before Sorting : " + footballTeam);
|
||||
Collections.sort(footballTeam, byRanking);
|
||||
System.out.println("After Sorting : " + footballTeam);
|
||||
assertEquals(footballTeam.get(0)
|
||||
.getName(), "Steven");
|
||||
assertEquals(footballTeam.get(2)
|
||||
.getRanking(), 67);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenComparing_UsingComparatorComparing_thenSorted() {
|
||||
System.out.println("********* Comaparator.comparing method *********");
|
||||
System.out.println("********* byRanking *********");
|
||||
Comparator<Player> byRanking = Comparator.comparing(Player::getRanking);
|
||||
|
||||
System.out.println("Before Sorting : " + footballTeam);
|
||||
Collections.sort(footballTeam, byRanking);
|
||||
System.out.println("After Sorting : " + footballTeam);
|
||||
assertEquals(footballTeam.get(0)
|
||||
.getName(), "Steven");
|
||||
assertEquals(footballTeam.get(2)
|
||||
.getRanking(), 67);
|
||||
|
||||
System.out.println("********* byAge *********");
|
||||
Comparator<Player> byAge = Comparator.comparing(Player::getAge);
|
||||
|
||||
System.out.println("Before Sorting : " + footballTeam);
|
||||
Collections.sort(footballTeam, byAge);
|
||||
System.out.println("After Sorting : " + footballTeam);
|
||||
assertEquals(footballTeam.get(0)
|
||||
.getName(), "Roger");
|
||||
assertEquals(footballTeam.get(2)
|
||||
.getRanking(), 45);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -2,14 +2,24 @@ package com.baeldung.file;
|
||||
|
||||
import static org.assertj.core.api.Assertions.assertThat;
|
||||
|
||||
import java.io.BufferedWriter;
|
||||
import java.io.File;
|
||||
import java.io.FileInputStream;
|
||||
import java.io.FileOutputStream;
|
||||
import java.io.FileWriter;
|
||||
import java.io.IOException;
|
||||
import java.io.PrintWriter;
|
||||
import java.nio.charset.StandardCharsets;
|
||||
import java.nio.file.Files;
|
||||
import java.nio.file.Paths;
|
||||
import java.nio.file.StandardOpenOption;
|
||||
|
||||
import com.google.common.base.Charsets;
|
||||
import com.google.common.io.CharSink;
|
||||
import com.google.common.io.FileWriteMode;
|
||||
import org.apache.commons.io.FileUtils;
|
||||
import org.junit.After;
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
import com.baeldung.util.StreamUtils;
|
||||
@@ -18,6 +28,26 @@ public class FilesTest {
|
||||
|
||||
public static final String fileName = "src/main/resources/countries.properties";
|
||||
|
||||
@Before
|
||||
@After
|
||||
public void setup() throws Exception {
|
||||
PrintWriter writer = new PrintWriter(fileName);
|
||||
writer.print("UK\r\n" + "US\r\n" + "Germany\r\n");
|
||||
writer.close();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenAppendToFileUsingGuava_thenCorrect() throws IOException {
|
||||
File file = new File(fileName);
|
||||
CharSink chs = com.google.common.io.Files.asCharSink(file, Charsets.UTF_8, FileWriteMode.APPEND);
|
||||
chs.write("Spain\r\n");
|
||||
|
||||
assertThat(StreamUtils.getStringFromInputStream(
|
||||
new FileInputStream(fileName)))
|
||||
.isEqualTo("UK\r\n" + "US\r\n" + "Germany\r\n" + "Spain\r\n");
|
||||
}
|
||||
|
||||
|
||||
@Test
|
||||
public void whenAppendToFileUsingFiles_thenCorrect() throws IOException {
|
||||
Files.write(Paths.get(fileName), "Spain\r\n".getBytes(), StandardOpenOption.APPEND);
|
||||
@@ -27,10 +57,38 @@ public class FilesTest {
|
||||
.isEqualTo("UK\r\n" + "US\r\n" + "Germany\r\n" + "Spain\r\n");
|
||||
}
|
||||
|
||||
@After
|
||||
public void revertFile() throws IOException {
|
||||
PrintWriter writer = new PrintWriter(fileName);
|
||||
writer.print("UK\r\n" + "US\r\n" + "Germany\r\n");
|
||||
writer.close();
|
||||
@Test
|
||||
public void whenAppendToFileUsingFileUtils_thenCorrect() throws IOException {
|
||||
File file = new File(fileName);
|
||||
FileUtils.writeStringToFile(file, "Spain\r\n", StandardCharsets.UTF_8, true);
|
||||
|
||||
assertThat(StreamUtils.getStringFromInputStream(
|
||||
new FileInputStream(fileName)))
|
||||
.isEqualTo("UK\r\n" + "US\r\n" + "Germany\r\n" + "Spain\r\n");
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenAppendToFileUsingFileOutputStream_thenCorrect() throws Exception {
|
||||
FileOutputStream fos = new FileOutputStream(fileName, true);
|
||||
fos.write("Spain\r\n".getBytes());
|
||||
fos.close();
|
||||
|
||||
assertThat(StreamUtils.getStringFromInputStream(
|
||||
new FileInputStream(fileName)))
|
||||
.isEqualTo("UK\r\n" + "US\r\n" + "Germany\r\n" + "Spain\r\n");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenAppendToFileUsingFileWriter_thenCorrect() throws IOException {
|
||||
FileWriter fw = new FileWriter(fileName, true);
|
||||
BufferedWriter bw = new BufferedWriter(fw);
|
||||
bw.write("Spain");
|
||||
bw.newLine();
|
||||
bw.close();
|
||||
|
||||
assertThat(
|
||||
StreamUtils.getStringFromInputStream(
|
||||
new FileInputStream(fileName)))
|
||||
.isEqualTo("UK\r\n" + "US\r\n" + "Germany\r\n" + "Spain\n");
|
||||
}
|
||||
}
|
||||
@@ -1,42 +0,0 @@
|
||||
package com.baeldung.javac;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
|
||||
public class SampleJavacPluginIntegrationTest {
|
||||
|
||||
private static final String CLASS_TEMPLATE =
|
||||
"package com.baeldung.javac;\n" +
|
||||
"\n" +
|
||||
"public class Test {\n" +
|
||||
" public static %1$s service(@Positive %1$s i) {\n" +
|
||||
" return i;\n" +
|
||||
" }\n" +
|
||||
"}\n" +
|
||||
"";
|
||||
|
||||
private TestCompiler compiler = new TestCompiler();
|
||||
private TestRunner runner = new TestRunner();
|
||||
|
||||
@Test(expected = IllegalArgumentException.class)
|
||||
public void givenInt_whenNegative_thenThrowsException() throws Throwable {
|
||||
compileAndRun(double.class,-1);
|
||||
}
|
||||
|
||||
@Test(expected = IllegalArgumentException.class)
|
||||
public void givenInt_whenZero_thenThrowsException() throws Throwable {
|
||||
compileAndRun(int.class,0);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenInt_whenPositive_thenSuccess() throws Throwable {
|
||||
assertEquals(1, compileAndRun(int.class, 1));
|
||||
}
|
||||
|
||||
private Object compileAndRun(Class<?> argumentType, Object argument) throws Throwable {
|
||||
String qualifiedClassName = "com.baeldung.javac.Test";
|
||||
byte[] byteCode = compiler.compile(qualifiedClassName, String.format(CLASS_TEMPLATE, argumentType.getName()));
|
||||
return runner.run(byteCode, qualifiedClassName, "service", new Class[] {argumentType}, argument);
|
||||
}
|
||||
}
|
||||
@@ -1,26 +0,0 @@
|
||||
package com.baeldung.javac;
|
||||
|
||||
import javax.tools.SimpleJavaFileObject;
|
||||
import java.io.ByteArrayOutputStream;
|
||||
import java.io.IOException;
|
||||
import java.io.OutputStream;
|
||||
import java.net.URI;
|
||||
|
||||
/** Holds compiled byte code in a byte array */
|
||||
public class SimpleClassFile extends SimpleJavaFileObject {
|
||||
|
||||
private ByteArrayOutputStream out;
|
||||
|
||||
public SimpleClassFile(URI uri) {
|
||||
super(uri, Kind.CLASS);
|
||||
}
|
||||
|
||||
@Override
|
||||
public OutputStream openOutputStream() throws IOException {
|
||||
return out = new ByteArrayOutputStream();
|
||||
}
|
||||
|
||||
public byte[] getCompiledBinaries() {
|
||||
return out.toByteArray();
|
||||
}
|
||||
}
|
||||
@@ -1,34 +0,0 @@
|
||||
package com.baeldung.javac;
|
||||
|
||||
import javax.tools.*;
|
||||
import java.net.URI;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
/** Adapts {@link SimpleClassFile} to the {@link JavaCompiler} */
|
||||
public class SimpleFileManager extends ForwardingJavaFileManager<StandardJavaFileManager> {
|
||||
|
||||
private final List<SimpleClassFile> compiled = new ArrayList<>();
|
||||
|
||||
public SimpleFileManager(StandardJavaFileManager delegate) {
|
||||
super(delegate);
|
||||
}
|
||||
|
||||
@Override
|
||||
public JavaFileObject getJavaFileForOutput(Location location,
|
||||
String className,
|
||||
JavaFileObject.Kind kind,
|
||||
FileObject sibling)
|
||||
{
|
||||
SimpleClassFile result = new SimpleClassFile(URI.create("string://" + className));
|
||||
compiled.add(result);
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* @return compiled binaries processed by the current class
|
||||
*/
|
||||
public List<SimpleClassFile> getCompiled() {
|
||||
return compiled;
|
||||
}
|
||||
}
|
||||
@@ -1,23 +0,0 @@
|
||||
package com.baeldung.javac;
|
||||
|
||||
import javax.tools.SimpleJavaFileObject;
|
||||
import java.net.URI;
|
||||
|
||||
/** Exposes given test source to the compiler. */
|
||||
public class SimpleSourceFile extends SimpleJavaFileObject {
|
||||
|
||||
private final String content;
|
||||
|
||||
public SimpleSourceFile(String qualifiedClassName, String testSource) {
|
||||
super(URI.create(String.format("file://%s%s",
|
||||
qualifiedClassName.replaceAll("\\.", "/"),
|
||||
Kind.SOURCE.extension)),
|
||||
Kind.SOURCE);
|
||||
content = testSource;
|
||||
}
|
||||
|
||||
@Override
|
||||
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
|
||||
return content;
|
||||
}
|
||||
}
|
||||
@@ -1,35 +0,0 @@
|
||||
package com.baeldung.javac;
|
||||
|
||||
import javax.tools.JavaCompiler;
|
||||
import javax.tools.ToolProvider;
|
||||
import java.io.StringWriter;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
import static java.util.Arrays.asList;
|
||||
import static java.util.Collections.singletonList;
|
||||
|
||||
public class TestCompiler {
|
||||
public byte[] compile(String qualifiedClassName, String testSource) {
|
||||
StringWriter output = new StringWriter();
|
||||
|
||||
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
|
||||
SimpleFileManager fileManager = new SimpleFileManager(compiler.getStandardFileManager(
|
||||
null,
|
||||
null,
|
||||
null
|
||||
));
|
||||
List<SimpleSourceFile> compilationUnits = singletonList(new SimpleSourceFile(qualifiedClassName, testSource));
|
||||
List<String> arguments = new ArrayList<>();
|
||||
arguments.addAll(asList("-classpath", System.getProperty("java.class.path"),
|
||||
"-Xplugin:" + SampleJavacPlugin.NAME));
|
||||
JavaCompiler.CompilationTask task = compiler.getTask(output,
|
||||
fileManager,
|
||||
null,
|
||||
arguments,
|
||||
null,
|
||||
compilationUnits);
|
||||
task.call();
|
||||
return fileManager.getCompiled().iterator().next().getCompiledBinaries();
|
||||
}
|
||||
}
|
||||
@@ -1,41 +0,0 @@
|
||||
package com.baeldung.javac;
|
||||
|
||||
import java.lang.reflect.InvocationTargetException;
|
||||
import java.lang.reflect.Method;
|
||||
|
||||
public class TestRunner {
|
||||
|
||||
public Object run(byte[] byteCode,
|
||||
String qualifiedClassName,
|
||||
String methodName,
|
||||
Class<?>[] argumentTypes,
|
||||
Object... args)
|
||||
throws Throwable
|
||||
{
|
||||
ClassLoader classLoader = new ClassLoader() {
|
||||
@Override
|
||||
protected Class<?> findClass(String name) throws ClassNotFoundException {
|
||||
return defineClass(name, byteCode, 0, byteCode.length);
|
||||
}
|
||||
};
|
||||
Class<?> clazz;
|
||||
try {
|
||||
clazz = classLoader.loadClass(qualifiedClassName);
|
||||
} catch (ClassNotFoundException e) {
|
||||
throw new RuntimeException("Can't load compiled test class", e);
|
||||
}
|
||||
|
||||
Method method;
|
||||
try {
|
||||
method = clazz.getMethod(methodName, argumentTypes);
|
||||
} catch (NoSuchMethodException e) {
|
||||
throw new RuntimeException("Can't find the 'main()' method in the compiled test class", e);
|
||||
}
|
||||
|
||||
try {
|
||||
return method.invoke(null, args);
|
||||
} catch (InvocationTargetException e) {
|
||||
throw e.getCause();
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,37 @@
|
||||
package com.baeldung.loops;
|
||||
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
|
||||
public class WhenUsingLoops {
|
||||
|
||||
private LoopsInJava loops = new LoopsInJava();
|
||||
|
||||
@Test
|
||||
public void shouldRunForLoop() {
|
||||
int[] expected = { 0, 1, 2, 3, 4 };
|
||||
int[] actual = loops.simple_for_loop();
|
||||
Assert.assertArrayEquals(expected, actual);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void shouldRunEnhancedForeachLoop() {
|
||||
int[] expected = { 0, 1, 2, 3, 4 };
|
||||
int[] actual = loops.enhanced_for_each_loop();
|
||||
Assert.assertArrayEquals(expected, actual);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void shouldRunWhileLoop() {
|
||||
int[] expected = { 0, 1, 2, 3, 4 };
|
||||
int[] actual = loops.while_loop();
|
||||
Assert.assertArrayEquals(expected, actual);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void shouldRunDoWhileLoop() {
|
||||
int[] expected = { 0, 1, 2, 3, 4 };
|
||||
int[] actual = loops.do_while_loop();
|
||||
Assert.assertArrayEquals(expected, actual);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,20 @@
|
||||
package com.baeldung.nestedclass;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
abstract class SimpleAbstractClass {
|
||||
abstract void run();
|
||||
}
|
||||
|
||||
public class AnonymousInner {
|
||||
|
||||
@Test
|
||||
public void run() {
|
||||
SimpleAbstractClass simpleAbstractClass = new SimpleAbstractClass() {
|
||||
void run() {
|
||||
System.out.println("Running Anonymous Class...");
|
||||
}
|
||||
};
|
||||
simpleAbstractClass.run();
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,21 @@
|
||||
package com.baeldung.nestedclass;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
public class Enclosing {
|
||||
|
||||
private static int x = 1;
|
||||
|
||||
public static class StaticNested {
|
||||
|
||||
private void run() {
|
||||
System.out.println("x = " + x);
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void test() {
|
||||
Enclosing.StaticNested nested = new Enclosing.StaticNested();
|
||||
nested.run();
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,22 @@
|
||||
package com.baeldung.nestedclass;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
public class NewEnclosing {
|
||||
|
||||
private void run() {
|
||||
class Local {
|
||||
void run() {
|
||||
System.out.println("Welcome to Baeldung!");
|
||||
}
|
||||
}
|
||||
Local local = new Local();
|
||||
local.run();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void test() {
|
||||
NewEnclosing newEnclosing = new NewEnclosing();
|
||||
newEnclosing.run();
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,30 @@
|
||||
package com.baeldung.nestedclass;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
public class NewOuter {
|
||||
|
||||
int a = 1;
|
||||
static int b = 2;
|
||||
|
||||
public class InnerClass {
|
||||
int a = 3;
|
||||
static final int b = 4;
|
||||
|
||||
public void run() {
|
||||
System.out.println("a = " + a);
|
||||
System.out.println("b = " + b);
|
||||
System.out.println("NewOuterTest.this.a = " + NewOuter.this.a);
|
||||
System.out.println("NewOuterTest.b = " + NewOuter.b);
|
||||
System.out.println("NewOuterTest.this.b = " + NewOuter.this.b);
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void test() {
|
||||
NewOuter outer = new NewOuter();
|
||||
NewOuter.InnerClass inner = outer.new InnerClass();
|
||||
inner.run();
|
||||
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,20 @@
|
||||
package com.baeldung.nestedclass;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
public class Outer {
|
||||
|
||||
public class Inner {
|
||||
|
||||
public void run() {
|
||||
System.out.println("Calling test...");
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void test() {
|
||||
Outer outer = new Outer();
|
||||
Outer.Inner inner = outer.new Inner();
|
||||
inner.run();
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,34 @@
|
||||
package com.baeldung.polymorphism;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
import java.awt.image.BufferedImage;
|
||||
|
||||
import org.junit.Ignore;
|
||||
import org.junit.Test;
|
||||
|
||||
public class PolymorphismUnitTest {
|
||||
|
||||
@Test
|
||||
public void givenImageFile_whenFileCreated_shouldSucceed() {
|
||||
ImageFile imageFile = FileManager.createImageFile("SampleImageFile", 200, 100, new BufferedImage(100, 200, BufferedImage.TYPE_INT_RGB).toString()
|
||||
.getBytes(), "v1.0.0");
|
||||
assertEquals(200, imageFile.getHeight());
|
||||
}
|
||||
|
||||
// Downcasting then Upcasting
|
||||
@Test
|
||||
public void givenTextFile_whenTextFileCreatedAndAssignedToGenericFileAndCastBackToTextFileOnGetWordCount_shouldSucceed() {
|
||||
GenericFile textFile = FileManager.createTextFile("SampleTextFile", "This is a sample text content", "v1.0.0");
|
||||
TextFile textFile2 = (TextFile) textFile;
|
||||
assertEquals(6, textFile2.getWordCount());
|
||||
}
|
||||
|
||||
// Downcasting
|
||||
@Test(expected = ClassCastException.class)
|
||||
public void givenGenericFile_whenCastToTextFileAndInvokeGetWordCount_shouldFail() {
|
||||
GenericFile genericFile = new GenericFile();
|
||||
TextFile textFile = (TextFile) genericFile;
|
||||
System.out.println(textFile.getWordCount());
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,60 @@
|
||||
package com.baeldung.varargs;
|
||||
|
||||
import org.junit.Test;
|
||||
|
||||
import static org.hamcrest.CoreMatchers.is;
|
||||
import static org.hamcrest.MatcherAssert.assertThat;
|
||||
|
||||
public class FormatterTest {
|
||||
|
||||
private final static String FORMAT = "%s %s %s";
|
||||
|
||||
@Test
|
||||
public void givenNoArgument_thenEmptyAndTwoSpacesAreReturned() {
|
||||
String actualResult = format();
|
||||
|
||||
assertThat(actualResult, is("empty "));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenOneArgument_thenResultHasTwoTrailingSpace() {
|
||||
String actualResult = format("baeldung");
|
||||
|
||||
assertThat(actualResult, is("baeldung "));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenTwoArguments_thenOneTrailingSpaceExists() {
|
||||
String actualResult = format("baeldung", "rocks");
|
||||
|
||||
assertThat(actualResult, is("baeldung rocks "));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenMoreThanThreeArguments_thenTheFirstThreeAreUsed() {
|
||||
String actualResult = formatWithVarArgs("baeldung", "rocks", "java", "and", "spring");
|
||||
|
||||
assertThat(actualResult, is("baeldung rocks java"));
|
||||
}
|
||||
|
||||
public String format() {
|
||||
return format("empty", "");
|
||||
}
|
||||
|
||||
public String format(String value) {
|
||||
return format(value, "");
|
||||
}
|
||||
|
||||
public String format(String val1, String val2) {
|
||||
return String.format(FORMAT, val1, val2, "");
|
||||
}
|
||||
|
||||
public String formatWithVarArgs(String... values) {
|
||||
if (values.length == 0) {
|
||||
return "no arguments given";
|
||||
}
|
||||
|
||||
return String.format(FORMAT, values);
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user