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Merge branch 'eugenp:master' into master

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This commit is contained in:
edizor
2023-01-20 16:10:28 +08:00
committed by GitHub
parent 00913e061a cf5eeaa176
commit cf1f2e87c2
32 changed files with 797 additions and 137 deletions
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core-java-modules/core-java-collections-array-list/pom.xml
+33
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@@ -5,6 +5,33 @@
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-array-list</artifactId>
<version>0.1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${maven-compiler-plugin.source}</source>
<target>${maven-compiler-plugin.target}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>
--add-opens java.base/java.util=ALL-UNNAMED
</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven-compiler-plugin.source>16</maven-compiler-plugin.source>
<maven-compiler-plugin.target>16</maven-compiler-plugin.target>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
<name>core-java-collections-array-list</name>
<packaging>jar</packaging>
@@ -20,6 +47,12 @@
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>31.1-jre</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
core-java-modules/core-java-collections-array-list/src/main/java/com/baeldung/listofobjectstolistofstring/Node.java
+17
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@@ -0,0 +1,17 @@
package com.baeldung.listofobjectstolistofstring;
public class Node {
private final int x;
private final int y;
public Node(int x, int y) {
this.x = x;
this.y = y;
}
@Override
public String toString() {
return "Node (" + "x=" + x + ", y=" + y + ')';
}
}
core-java-modules/core-java-collections-array-list/src/main/java/com/baeldung/listofobjectstolistofstring/User.java
+14
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@@ -0,0 +1,14 @@
package com.baeldung.listofobjectstolistofstring;
public class User {
private final String fullName;
public User(String fullName) {
this.fullName = fullName;
}
@Override
public String toString() {
return "User (" + "full name='" + fullName + ')';
}
}
core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listofobjectstolistofstring/ConvertObjectListToStringListUnitTest.java
+92
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@@ -0,0 +1,92 @@
package com.baeldung.listofobjectstolistofstring;
import com.google.common.collect.Lists;
import org.junit.Assert;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
public class ConvertObjectListToStringListUnitTest {
@Test
public void givenObjectList_whenForEachUsedToConvert_thenReturnSuccess() {
List<String> outputList = new ArrayList<>(objectListWithNull().size());
for (Object obj : objectListWithNull()) {
outputList.add(Objects.toString(obj, null));
}
Assert.assertEquals(expectedStringListWithNull(), outputList);
}
@Test
public void givenObjectList_whenUsingStreamsToConvert_thenReturnSuccess() {
List<String> outputList;
outputList = objectListWithNull().stream()
.map((obj) -> Objects.toString(obj, null))
.collect(Collectors.toList());
Assert.assertEquals(expectedStringListWithNull(), outputList);
}
@Test
public void givenObjectList_whenUsingStreamsUnmodifiableListToConvert_thenReturnSuccess() {
List<String> outputList;
outputList = objectListWithNull().stream()
.filter(Objects::nonNull)
.map((obj) -> Objects.toString(obj, null))
.collect(Collectors.toUnmodifiableList());
Assert.assertEquals(expectedStringListWithoutNull(), outputList);
}
@Test
public void givenObjectList_whenUsingGuavaTransform_thenReturnSuccess() {
List<String> outputList;
outputList = Lists.transform(objectListWithNull(), obj -> Objects.toString(obj, null));
Assert.assertEquals(expectedStringListWithNull(), outputList);
}
@Test
public void givenObjectListWithNoNull_whenUsingToList_thenReturnSuccess() {
List<String> outputList;
outputList = objectListWithoutNull().stream()
.map((obj) -> Objects.toString(obj, null))
.toList();
Assert.assertEquals(expectedStringListWithoutNull(), outputList);
}
private List<String> expectedStringListWithNull() {
List<String> listOfStrings = new ArrayList<>();
listOfStrings.add("1");
listOfStrings.add("true");
listOfStrings.add("hello");
listOfStrings.add(Double.toString(273773.98));
listOfStrings.add(null);
listOfStrings.add(new Node(2, 4).toString());
listOfStrings.add(new User("John Doe").toString());
return listOfStrings;
}
private List<Object> objectListWithNull() {
List<Object> listOfStrings = new ArrayList<>();
listOfStrings.add(1);
listOfStrings.add(true);
listOfStrings.add("hello");
listOfStrings.add(Double.valueOf(273773.98));
listOfStrings.add(null);
listOfStrings.add(new Node(2, 4));
listOfStrings.add(new User("John Doe"));
return listOfStrings;
}
private List<String> expectedStringListWithoutNull() {
return List.of("1", "true", "hello", Double.toString(273773.98), new Node(2, 4).toString(), new User("John Doe").toString());
}
private List<Object> objectListWithoutNull() {
return List.of(1, true, "hello", Double.valueOf(273773.98), new Node(2, 4), new User("John Doe"));
}
}
core-java-modules/core-java-lang-5/src/main/java/com/baeldung/convertnumberbases/ConvertNumberBases.java
+30 -22
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@@ -2,68 +2,76 @@ package com.baeldung.convertnumberbases;
public class ConvertNumberBases {
public static String convertNumberToNewBase(String number, int base, int newBase){
public static String convertNumberToNewBase(String number, int base, int newBase) {
return Integer.toString(Integer.parseInt(number, base), newBase);
}
public static String convertNumberToNewBaseCustom(String num, int base, int newBase) {
int decimalNumber = convertFromAnyBaseToDecimal(num, base);
return convertFromDecimalToBaseX(decimalNumber, newBase);
String targetBase = "";
try {
targetBase = convertFromDecimalToBaseX(decimalNumber, newBase);
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
return targetBase;
}
public static String convertFromDecimalToBaseX(int num, int newBase) {
public static String convertFromDecimalToBaseX(int num, int newBase) throws IllegalArgumentException {
if ((newBase < 2 || newBase > 10) && newBase != 16) {
throw new IllegalArgumentException("New base must be from 2 - 10 or 16");
}
String result = "";
int remainder;
while (num > 0) {
remainder = num % newBase;
if (newBase == 16) {
if (remainder == 10)
if (remainder == 10) {
result += 'A';
else if (remainder == 11)
} else if (remainder == 11) {
result += 'B';
else if (remainder == 12)
} else if (remainder == 12) {
result += 'C';
else if (remainder == 13)
} else if (remainder == 13) {
result += 'D';
else if (remainder == 14)
} else if (remainder == 14) {
result += 'E';
else if (remainder == 15)
} else if (remainder == 15) {
result += 'F';
else
} else {
result += remainder;
} else
}
} else {
result += remainder;
}
num /= newBase;
}
return new StringBuffer(result).reverse().toString();
}
public static int convertFromAnyBaseToDecimal(String num, int base) {
if (base < 2 || (base > 10 && base != 16))
if (base < 2 || (base > 10 && base != 16)) {
return -1;
}
int val = 0;
int power = 1;
for (int i = num.length() - 1; i >= 0; i--) {
int digit = charToDecimal(num.charAt(i));
if (digit < 0 || digit >= base)
if (digit < 0 || digit >= base) {
return -1;
}
val += digit * power;
power = power * base;
}
return val;
}
public static int charToDecimal(char c) {
if (c >= '0' && c <= '9')
if (c >= '0' && c <= '9') {
return (int) c - '0';
else
} else {
return (int) c - 'A' + 10;
}
}
}
core-java-modules/core-java-lang-5/src/test/java/com/baeldung/convertnumberbases/ConvertNumberBasesUnitTest.java
+12
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@@ -1,5 +1,6 @@
package com.baeldung.convertnumberbases;
import static com.baeldung.convertnumberbases.ConvertNumberBases.convertFromDecimalToBaseX;
import static com.baeldung.convertnumberbases.ConvertNumberBases.convertNumberToNewBase;
import static com.baeldung.convertnumberbases.ConvertNumberBases.convertNumberToNewBaseCustom;
import static org.junit.jupiter.api.Assertions.*;
@@ -17,4 +18,15 @@ class ConvertNumberBasesUnitTest {
assertEquals(convertNumberToNewBaseCustom("11001000", 2, 8), "310");
}
@Test
void whenInputIsOutOfRange_thenIllegalArgumentExceptionIsThrown() {
Exception exception = assertThrows(IllegalArgumentException.class, ()-> {
convertFromDecimalToBaseX(100, 12);
});
String expectedMessage = "New base must be from 2 - 10 or 16";
String actualMessage = exception.getMessage();
assertTrue(actualMessage.contains(expectedMessage));
}
}
core-java-modules/pom.xml
-1
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@@ -31,7 +31,6 @@
<module>core-java-collections-2</module>
<module>core-java-collections-3</module>
<module>core-java-collections-4</module>
<module>core-java-collections-array-list</module>
<module>core-java-collections-conversions</module>
<module>core-java-collections-conversions-2</module>
<module>core-java-collections-set-2</module>