Merge remote-tracking branch 'eugenp/master'

core-java-collections/pom.xml

@@ -53,15 +53,27 @@
             <version>${junit.platform.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${openjdk.jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${openjdk.jmh.version}</version>
+        </dependency>
     </dependencies>
 
+
     <properties>
+        <openjdk.jmh.version>1.19</openjdk.jmh.version>
         <junit.platform.version>1.2.0</junit.platform.version>
         <commons-lang3.version>3.5</commons-lang3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
         <avaitility.version>1.7.0</avaitility.version>
         <assertj.version>3.6.1</assertj.version>
-        <eclipse.collections.version>9.2.0</eclipse.collections.version>
+        <eclipse.collections.version>7.1.0</eclipse.collections.version>
     </properties>
 </project>

core-java-collections/src/main/java/com/baeldung/performance/CollectionsBenchmark.java

@@ -0,0 +1,59 @@
+package com.baeldung.performance;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@Warmup(iterations = 5)
+public class CollectionsBenchmark {
+
+    @State(Scope.Thread)
+    public static class MyState {
+        private Set<Employee> employeeSet = new HashSet<>();
+        private List<Employee> employeeList = new ArrayList<>();
+
+        private long iterations = 10000;
+
+        private Employee employee = new Employee(100L, "Harry");
+
+        @Setup(Level.Trial)
+        public void setUp() {
+
+            for (long i = 0; i < iterations; i++) {
+                employeeSet.add(new Employee(i, "John"));
+                employeeList.add(new Employee(i, "John"));
+            }
+
+            employeeList.add(employee);
+            employeeSet.add(employee);
+        }
+    }
+
+    @Benchmark
+    public boolean testArrayList(MyState state) {
+        return state.employeeList.contains(state.employee);
+    }
+
+    @Benchmark
+    public boolean testHashSet(MyState state) {
+        return state.employeeSet.contains(state.employee);
+    }
+
+    public static void main(String[] args) throws Exception {
+        Options options = new OptionsBuilder()
+                .include(CollectionsBenchmark.class.getSimpleName()).threads(1)
+                .forks(1).shouldFailOnError(true)
+                .shouldDoGC(true)
+                .jvmArgs("-server").build();
+        new Runner(options).run();
+    }
+}

core-java-collections/src/main/java/com/baeldung/performance/Employee.java

@@ -0,0 +1,31 @@
+package com.baeldung.performance;
+
+public class Employee {
+
+    private Long id;
+    private String name;
+
+    public Employee(Long id, String name) {
+        this.name = name;
+        this.id = id;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Employee employee = (Employee) o;
+
+        if (!id.equals(employee.id)) return false;
+        return name.equals(employee.name);
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = id.hashCode();
+        result = 31 * result + name.hashCode();
+        return result;
+    }
+}

core-java-collections/src/test/java/com/baeldung/collection/StreamOperateAndRemoveUnitTest.java

@@ -0,0 +1,78 @@
+package com.baeldung.collection;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class StreamOperateAndRemoveUnitTest {
+
+    private List<Item> itemList;
+
+    @Before
+    public void setup() {
+
+        itemList = new ArrayList<>();
+        for (int i = 0; i < 10; i++) {
+            itemList.add(new Item(i));
+        }
+    }
+
+    @Test
+    public void givenAListOf10Items_whenFilteredForQualifiedItems_thenFilteredListContains5Items() {
+
+        final List<Item> filteredList = itemList.stream().filter(item -> item.isQualified())
+            .collect(Collectors.toList());
+
+        Assert.assertEquals(5, filteredList.size());
+    }
+
+    @Test
+    public void givenAListOf10Items_whenOperateAndRemoveQualifiedItemsUsingRemoveIf_thenListContains5Items() {
+
+        itemList.stream().filter(item -> item.isQualified()).forEach(item -> item.operate());
+        itemList.removeIf(item -> item.isQualified());
+
+        Assert.assertEquals(5, itemList.size());
+    }
+
+    @Test
+    public void givenAListOf10Items_whenOperateAndRemoveQualifiedItemsUsingRemoveAll_thenListContains5Items() {
+
+        final List<Item> operatedList = new ArrayList<>();
+        itemList.stream().filter(item -> item.isQualified()).forEach(item -> {
+            item.operate();
+            operatedList.add(item);
+        });
+        itemList.removeAll(operatedList);
+
+        Assert.assertEquals(5, itemList.size());
+    }
+
+    class Item {
+
+        private final Logger logger = LoggerFactory.getLogger(this.getClass().getName());
+
+        private final int value;
+
+        public Item(final int value) {
+
+            this.value = value;
+        }
+
+        public boolean isQualified() {
+
+            return value % 2 == 0;
+        }
+
+        public void operate() {
+
+            logger.info("Even Number: " + this.value);
+        }
+    }
+}

core-java-io/src/main/java/com/baeldung/fileparser/BufferedReaderExample.java

@@ -0,0 +1,24 @@
+package com.baeldung.fileparser;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class BufferedReaderExample {
+
+    protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
+
+        ArrayList<String> result = new ArrayList<>();
+
+        try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
+
+            while (br.ready()) {
+                result.add(br.readLine());
+            }
+            return result;
+        }
+
+    }
+
+}

core-java-io/src/main/java/com/baeldung/fileparser/FileReaderExample.java

@@ -0,0 +1,31 @@
+package com.baeldung.fileparser;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class FileReaderExample {
+
+    protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
+
+        ArrayList<String> result = new ArrayList<>();
+
+        try (FileReader f = new FileReader(filename)) {
+            StringBuffer sb = new StringBuffer();
+            while (f.ready()) {
+                char c = (char) f.read();
+                if (c == '\n') {
+                    result.add(sb.toString());
+                    sb = new StringBuffer();
+                } else {
+                    sb.append(c);
+                }
+            }
+            if (sb.length() > 0) {
+                result.add(sb.toString());
+            }
+        }
+        
+        return result;
+    }
+}

core-java-io/src/main/java/com/baeldung/fileparser/FilesReadLinesExample.java

@@ -0,0 +1,18 @@
+package com.baeldung.fileparser;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+public class FilesReadLinesExample {
+
+    protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
+        
+        List<String> result = Files.readAllLines(Paths.get(filename));
+        
+        return (ArrayList<String>) result;
+    }
+
+}

core-java-io/src/main/java/com/baeldung/fileparser/ScannerIntExample.java

@@ -0,0 +1,24 @@
+package com.baeldung.fileparser;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class ScannerIntExample {
+
+    protected static ArrayList<Integer> generateArrayListFromFile(String filename) throws IOException {
+        
+        ArrayList<Integer> result = new ArrayList<>();
+
+        try (Scanner s = new Scanner(new FileReader(filename))) {
+
+            while (s.hasNext()) {
+                result.add(s.nextInt());
+            }
+            return result;
+        }
+
+    }
+
+}

core-java-io/src/main/java/com/baeldung/fileparser/ScannerStringExample.java

@@ -0,0 +1,24 @@
+package com.baeldung.fileparser;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class ScannerStringExample {
+
+    protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
+        
+        ArrayList<String> result = new ArrayList<>();
+
+        try (Scanner s = new Scanner(new FileReader(filename))) {
+
+            while (s.hasNext()) {
+                result.add(s.nextLine());
+            }
+            return result;
+        }
+
+    }
+
+}

core-java-io/src/test/java/com/baeldung/fileparser/BufferedReaderUnitTest.java

@@ -0,0 +1,19 @@
+package com.baeldung.fileparser;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.Test;
+
+public class BufferedReaderUnitTest {
+
+    protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+    
+    @Test
+    public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
+        List<String> lines = BufferedReaderExample.generateArrayListFromFile(TEXT_FILENAME);
+        assertTrue("File does not has 2 lines", lines.size() == 2);
+    }
+}

core-java-io/src/test/java/com/baeldung/fileparser/FileReaderUnitTest.java

@@ -0,0 +1,19 @@
+package com.baeldung.fileparser;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.Test;
+
+public class FileReaderUnitTest {
+
+    protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+    
+    @Test
+    public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
+        List<String> lines = FileReaderExample.generateArrayListFromFile(TEXT_FILENAME);
+        assertTrue("File does not has 2 lines", lines.size() == 2);
+    }
+}

core-java-io/src/test/java/com/baeldung/fileparser/FilesReadAllLinesUnitTest.java

@@ -0,0 +1,19 @@
+package com.baeldung.fileparser;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.Test;
+
+public class FilesReadAllLinesUnitTest {
+
+    protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+
+    @Test
+    public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
+        List<String> lines = FilesReadLinesExample.generateArrayListFromFile(TEXT_FILENAME);
+        assertTrue("File does not has 2 lines", lines.size() == 2);
+    }
+}

core-java-io/src/test/java/com/baeldung/fileparser/ScannerIntUnitTest.java

@@ -0,0 +1,19 @@
+package com.baeldung.fileparser;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.Test;
+
+public class ScannerIntUnitTest {
+
+    protected static final String NUMBER_FILENAME = "src/test/resources/sampleNumberFile.txt";
+    
+    @Test
+    public void whenParsingExistingTextFile_thenGetIntArrayList() throws IOException {
+        List<Integer> numbers = ScannerIntExample.generateArrayListFromFile(NUMBER_FILENAME);
+        assertTrue("File does not has 2 lines", numbers.size() == 2);
+    }
+}

core-java-io/src/test/java/com/baeldung/fileparser/ScannerStringUnitTest.java

@@ -0,0 +1,19 @@
+package com.baeldung.fileparser;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.Test;
+
+public class ScannerStringUnitTest {
+
+    protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
+    
+    @Test
+    public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
+        List<String> lines = ScannerStringExample.generateArrayListFromFile(TEXT_FILENAME);
+        assertTrue("File does not has 2 lines", lines.size() == 2);
+    }
+}

core-java-io/src/test/resources/sampleNumberFile.txt

@@ -0,0 +1,2 @@
+111
+222

core-java-io/src/test/resources/sampleTextFile.txt

@@ -0,0 +1,2 @@
+Hello 
+World

core-java/src/main/java/com/baeldung/binding/Animal.java

@@ -0,0 +1,23 @@
+package com.baeldung.binding;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Created by madhumita.g on 25-07-2018.
+ */
+public class Animal {
+
+    final static Logger logger = LoggerFactory.getLogger(Animal.class);
+
+    public void makeNoise() {
+        logger.info("generic animal noise");
+    }
+
+    public void makeNoise(Integer repetitions) {
+        while(repetitions != 0) {
+            logger.info("generic animal noise countdown " + repetitions);
+            repetitions -= 1;
+        }
+    }
+}

core-java/src/main/java/com/baeldung/binding/AnimalActivity.java

@@ -0,0 +1,43 @@
+package com.baeldung.binding;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Created by madhumita.g on 25-07-2018.
+ */
+public class AnimalActivity {
+
+    final static Logger logger = LoggerFactory.getLogger(AnimalActivity.class);
+
+
+    public static void sleep(Animal animal) {
+        logger.info("Animal is sleeping");
+    }
+
+    public static void sleep(Cat cat) {
+        logger.info("Cat is sleeping");
+    }
+
+    public static void main(String[] args) {
+
+        Animal animal = new Animal();
+
+        //calling methods of animal object
+        animal.makeNoise();
+
+        animal.makeNoise(3);
+
+
+        //assigning a dog object to reference of type Animal
+        Animal catAnimal = new Cat();
+
+        catAnimal.makeNoise();
+
+        // calling static function
+        AnimalActivity.sleep(catAnimal);
+
+        return;
+
+    }
+}

core-java/src/main/java/com/baeldung/binding/Cat.java

@@ -0,0 +1,18 @@
+package com.baeldung.binding;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Created by madhumita.g on 25-07-2018.
+ */
+public class Cat extends Animal {
+
+    final static Logger logger = LoggerFactory.getLogger(Cat.class);
+
+    public void makeNoise() {
+
+        logger.info("meow");
+    }
+
+}

core-java/src/main/java/com/baeldung/keywords/finalize/FinalizeObject.java

@@ -0,0 +1,18 @@
+package com.baeldung.keywords.finalize;
+
+public class FinalizeObject {
+
+    @Override
+    protected void finalize() throws Throwable {
+        System.out.println("Execute finalize method");
+        super.finalize();
+    }
+
+    public static void main(String[] args) throws Exception {
+        FinalizeObject object = new FinalizeObject();
+        object = null;
+        System.gc();
+        Thread.sleep(1000);
+    }
+
+}

core-java/src/main/java/com/baeldung/keywords/finalkeyword/Child.java

@@ -0,0 +1,15 @@
+package com.baeldung.keywords.finalkeyword;
+
+public final class Child extends Parent {
+
+    @Override
+    void method1(int arg1, final int arg2) {
+        // OK
+    }
+
+/*    @Override
+    void method2() {
+        // Compilation error
+    }*/
+
+}

core-java/src/main/java/com/baeldung/keywords/finalkeyword/GrandChild.java

@@ -0,0 +1,5 @@
+package com.baeldung.keywords.finalkeyword;
+
+/*public class GrandChild extends Child {
+    // Compilation error
+}*/

core-java/src/main/java/com/baeldung/keywords/finalkeyword/Parent.java

@@ -0,0 +1,23 @@
+package com.baeldung.keywords.finalkeyword;
+
+public class Parent {
+
+    int field1 = 1;
+    final int field2 = 2;
+
+    Parent() {
+        field1 = 2; // OK
+//        field2 = 3; // Compilation error
+    }
+
+    void method1(int arg1, final int arg2) {
+        arg1 = 2; // OK
+//        arg2 = 3; // Compilation error
+    }
+
+    final void method2() {
+        final int localVar = 2; // OK
+//        localVar = 3; // Compilation error
+    }
+
+}

core-java/src/main/java/com/baeldung/keywords/finallykeyword/FinallyExample.java

@@ -0,0 +1,29 @@
+package com.baeldung.keywords.finallykeyword;
+
+public class FinallyExample {
+
+    public static void main(String args[]) throws Exception {
+        try {
+            System.out.println("Execute try block");
+            throw new Exception();
+        } catch (Exception e) {
+            System.out.println("Execute catch block");
+        } finally {
+            System.out.println("Execute finally block");
+        }
+
+        try {
+            System.out.println("Execute try block");
+        } finally {
+            System.out.println("Execute finally block");
+        }
+
+        try {
+            System.out.println("Execute try block");
+            throw new Exception();
+        } finally {
+            System.out.println("Execute finally block");
+        }
+    }
+
+}

core-java/src/main/java/com/baeldung/regexp/datepattern/optmization/OptimizedMatcher.java

@@ -0,0 +1,6 @@
+package com.baeldung.regexp.datepattern.optmization;
+
+public class OptimizedMatcher {
+
+
+}

core-java/src/test/java/com/baeldung/binding/AnimalActivityUnitTest.java

@@ -0,0 +1,95 @@
+package com.baeldung.binding;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.spi.LoggingEvent;
+import ch.qos.logback.core.Appender;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.slf4j.LoggerFactory;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.verify;
+
+/**
+ *https://gist.github.com/bloodredsun/a041de13e57bf3c6c040
+ */
+@RunWith(MockitoJUnitRunner.class)
+
+public class AnimalActivityUnitTest {
+
+    @Mock
+    private Appender mockAppender;
+    @Captor
+    private ArgumentCaptor<LoggingEvent> captorLoggingEvent;
+
+    @Before
+    public void setup() {
+        final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
+        logger.addAppender(mockAppender);
+    }
+
+    @After
+    public void teardown() {
+        final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
+        logger.detachAppender(mockAppender);
+    }
+
+    @Test
+    public void givenAnimalReference__whenRefersAnimalObject_shouldCallFunctionWithAnimalParam() {
+
+        Animal animal = new Animal();
+
+        AnimalActivity.sleep(animal);
+
+        verify(mockAppender).doAppend(captorLoggingEvent.capture());
+
+        final LoggingEvent loggingEvent = captorLoggingEvent.getValue();
+
+        assertThat(loggingEvent.getLevel(), is(Level.INFO));
+
+        assertThat(loggingEvent.getFormattedMessage(),
+                is("Animal is sleeping"));
+    }
+
+    @Test
+    public void givenDogReference__whenRefersCatObject_shouldCallFunctionWithAnimalParam() {
+
+        Cat cat = new Cat();
+
+        AnimalActivity.sleep(cat);
+
+        verify(mockAppender).doAppend(captorLoggingEvent.capture());
+
+        final LoggingEvent loggingEvent = captorLoggingEvent.getValue();
+
+        assertThat(loggingEvent.getLevel(), is(Level.INFO));
+
+        assertThat(loggingEvent.getFormattedMessage(),
+                is("Cat is sleeping"));
+    }
+
+    @Test
+    public void givenAnimaReference__whenRefersDogObject_shouldCallFunctionWithAnimalParam() {
+
+        Animal cat = new Cat();
+
+        AnimalActivity.sleep(cat);
+
+        verify(mockAppender).doAppend(captorLoggingEvent.capture());
+
+        final LoggingEvent loggingEvent = captorLoggingEvent.getValue();
+
+        assertThat(loggingEvent.getLevel(), is(Level.INFO));
+
+        assertThat(loggingEvent.getFormattedMessage(),
+                is("Animal is sleeping"));
+    }
+}

core-java/src/test/java/com/baeldung/binding/AnimalUnitTest.java

@@ -0,0 +1,86 @@
+package com.baeldung.binding;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.spi.LoggingEvent;
+import ch.qos.logback.core.Appender;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.slf4j.LoggerFactory;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Created by madhumita.g on 01-08-2018.
+ */
+
+@RunWith(MockitoJUnitRunner.class)
+public class AnimalUnitTest {
+    @Mock
+    private Appender mockAppender;
+    @Captor
+    private ArgumentCaptor<LoggingEvent> captorLoggingEvent;
+
+    @Before
+    public void setup() {
+        final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
+        logger.addAppender(mockAppender);
+    }
+
+    @After
+    public void teardown() {
+        final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
+        logger.detachAppender(mockAppender);
+    }
+
+    @Test
+    public void whenCalledWithoutParameters_shouldCallFunctionMakeNoiseWithoutParameters() {
+
+        Animal animal = new Animal();
+
+        animal.makeNoise();
+
+        verify(mockAppender).doAppend(captorLoggingEvent.capture());
+
+        final LoggingEvent loggingEvent = captorLoggingEvent.getValue();
+
+        assertThat(loggingEvent.getLevel(), is(Level.INFO));
+
+        assertThat(loggingEvent.getFormattedMessage(),
+                is("generic animal noise"));
+    }
+
+    @Test
+    public void whenCalledWithParameters_shouldCallFunctionMakeNoiseWithParameters() {
+
+        Animal animal = new Animal();
+
+        int testValue = 3;
+        animal.makeNoise(testValue);
+
+        verify(mockAppender).doAppend(captorLoggingEvent.capture());
+
+        final LoggingEvent loggingEvent = captorLoggingEvent.getValue();
+
+        while (testValue != 0) {
+            assertThat(loggingEvent.getLevel(), is(Level.INFO));
+
+            assertThat(loggingEvent.getFormattedMessage(),
+                    is("generic animal noise countdown 3\n"
+                            + "generic animal noise countdown 2\n"
+                            + "generic animal noise countdown 1\n"));
+
+            testValue-=1;
+
+        }
+    }
+
+}

core-java/src/test/java/com/baeldung/binding/CatUnitTest.java

@@ -0,0 +1,62 @@
+package com.baeldung.binding;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.spi.LoggingEvent;
+import ch.qos.logback.core.Appender;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import org.slf4j.LoggerFactory;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Created by madhumita.g on 01-08-2018.
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class CatUnitTest {
+
+    @Mock
+    private Appender mockAppender;
+
+    @Captor
+    private ArgumentCaptor<LoggingEvent> captorLoggingEvent;
+
+    @Before
+    public void setup() {
+        final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
+        logger.addAppender(mockAppender);
+    }
+
+    @After
+    public void teardown() {
+        final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
+        logger.detachAppender(mockAppender);
+    }
+
+    @Test
+    public void makeNoiseTest() {
+
+        Cat cat = new Cat();
+
+        cat.makeNoise();
+
+        verify(mockAppender).doAppend(captorLoggingEvent.capture());
+
+        final LoggingEvent loggingEvent = captorLoggingEvent.getValue();
+
+        assertThat(loggingEvent.getLevel(), is(Level.INFO));
+
+        assertThat(loggingEvent.getFormattedMessage(),
+                is("meow"));
+
+    }
+}

core-java/src/test/java/com/baeldung/java/listInitialization/ListInitializationUnitTest.java

@@ -9,28 +9,15 @@ import java.util.stream.Stream;
 import lombok.extern.java.Log;
 
 import org.junit.Assert;
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.ExpectedException;
 
 @Log
 public class ListInitializationUnitTest {
 
-    @Rule
-    public ExpectedException exception = ExpectedException.none();
-
     @Test
     public void givenAnonymousInnerClass_thenInitialiseList() {
         List<String> cities = new ArrayList() {
-            // Inside declaration of the subclass
-
-            // You can have multiple initializer block
             {
-                log.info("Inside the first initializer block.");
-            }
-
-            {
-                log.info("Inside the second initializer block.");
                 add("New York");
                 add("Rio");
                 add("Tokyo");
@@ -47,11 +34,10 @@ public class ListInitializationUnitTest {
         Assert.assertTrue(list.contains("foo"));
     }
 
-    @Test
+    @Test(expected = UnsupportedOperationException.class)
     public void givenArraysAsList_whenAdd_thenUnsupportedException() {
         List<String> list = Arrays.asList("foo", "bar");
 
-        exception.expect(UnsupportedOperationException.class);
         list.add("baz");
     }
 

core-java/src/test/java/com/baeldung/regexp/optmization/OptimizedMatcherUnitTest.java

@@ -0,0 +1,109 @@
+package com.baeldung.regexp.optmization;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static org.junit.Assert.assertTrue;
+
+public class OptimizedMatcherUnitTest {
+
+    private long time;
+    private long mstimePreCompiled;
+    private long mstimeNotPreCompiled;
+
+    private String action;
+
+    private List<String> items;
+
+    @Before
+    public void setup() {
+        Random random = new Random();
+        items = new ArrayList<String>();
+        long average = 0;
+
+        for (int i = 0; i < 100000; ++i) {
+            StringBuilder s = new StringBuilder();
+            int characters = random.nextInt(7) + 1;
+            for (int k = 0; k < characters; ++ k) {
+                char c = (char)(random.nextInt('Z' - 'A') + 'A');
+                int rep = random.nextInt(95) + 5;
+                for (int j = 0; j < rep; ++ j)
+                    s.append(c);
+                average += rep;
+            }
+            items.add(s.toString());
+        }
+
+        average /= 100000;
+        System.out.println("generated data, average length: " + average);
+    }
+
+
+    @Test
+    public void givenANotPreCompiledAndAPreCompiledPatternA_whenMatcheItems_thenPreCompiledFasterThanNotPreCompiled() {
+
+        testPatterns("A*");
+        assertTrue(mstimePreCompiled < mstimeNotPreCompiled);
+    }
+
+    @Test
+    public void givenANotPreCompiledAndAPreCompiledPatternABC_whenMatcheItems_thenPreCompiledFasterThanNotPreCompiled() {
+
+        testPatterns("A*B*C*");
+        assertTrue(mstimePreCompiled < mstimeNotPreCompiled);
+    }
+
+    @Test
+    public void givenANotPreCompiledAndAPreCompiledPatternECWF_whenMatcheItems_thenPreCompiledFasterThanNotPreCompiled() {
+
+        testPatterns("E*C*W*F*");
+        assertTrue(mstimePreCompiled < mstimeNotPreCompiled);
+    }
+
+    private void testPatterns(String regex) {
+        time = System.nanoTime();
+        int matched = 0;
+        int unmatched = 0;
+
+        for (String item : this.items) {
+            if (item.matches(regex)) {
+                ++matched;
+            }
+            else {
+                ++unmatched;
+            }
+        }
+
+        this.action = "uncompiled: regex=" + regex + " matched=" + matched + " unmatched=" + unmatched;
+
+        this.mstimeNotPreCompiled = (System.nanoTime() - time) / 1000000;
+        System.out.println(this.action + ": " + mstimeNotPreCompiled + "ms");
+
+        time = System.nanoTime();
+
+        Matcher matcher = Pattern.compile(regex).matcher("");
+        matched = 0;
+        unmatched = 0;
+
+        for (String item : this.items) {
+            if (matcher.reset(item).matches()) {
+                ++matched;
+            }
+            else {
+                ++unmatched;
+            }
+        }
+
+        this.action = "compiled: regex=" + regex + " matched=" + matched + " unmatched=" + unmatched;
+
+        this.mstimePreCompiled = (System.nanoTime() - time) / 1000000;
+        System.out.println(this.action + ": " + mstimePreCompiled + "ms");
+    }
+}