Merge remote-tracking branch 'eugenp/master'

2017-12-21 12:32:25 +02:00
parent a8bbb67c53 9ed1d5b7b4
commit 908b766575
406 changed files with 39555 additions and 903 deletions
@@ -0,0 +1,2 @@
+## Relevant articles:
+- [CAS SSO With Spring Security](http://www.baeldung.com/spring-security-cas-sso)
@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.0.BUILD-SNAPSHOT</version>
+		<version>2.0.0.M7</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>

@@ -87,14 +87,6 @@
 	</build>

 	<repositories>
-		<repository>
-			<id>spring-snapshots</id>
-			<name>Spring Snapshots</name>
-			<url>https://repo.spring.io/snapshot</url>
-			<snapshots>
-				<enabled>true</enabled>
-			</snapshots>
-		</repository>
 		<repository>
 			<id>spring-milestones</id>
 			<name>Spring Milestones</name>
@@ -106,14 +98,6 @@
 	</repositories>

 	<pluginRepositories>
-		<pluginRepository>
-			<id>spring-snapshots</id>
-			<name>Spring Snapshots</name>
-			<url>https://repo.spring.io/snapshot</url>
-			<snapshots>
-				<enabled>true</enabled>
-			</snapshots>
-		</pluginRepository>
 		<pluginRepository>
 			<id>spring-milestones</id>
 			<name>Spring Milestones</name>
@@ -1,6 +1,7 @@
 package com.baeldung.cassecuredapp.controllers;

-import org.apache.log4j.Logger;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.security.web.authentication.logout.CookieClearingLogoutHandler;
@@ -15,7 +16,7 @@ import javax.servlet.http.HttpServletResponse;
@Controller
 public class AuthController {

-    private Logger logger = Logger.getLogger(AuthController.class);
+    private Logger logger = LogManager.getLogger(AuthController.class);

    @GetMapping("/logout")
    public String logout(
@@ -32,3 +32,4 @@
 - [“Stream has already been operated upon or closed” Exception in Java](http://www.baeldung.com/java-stream-operated-upon-or-closed-exception)
 - [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
 - [Copy a File with Java](http://www.baeldung.com/java-copy-file)
+- [Generating Prime Numbers in Java](http://www.baeldung.com/java-generate-prime-numbers)
@@ -2,7 +2,6 @@ package com.baeldung.datetime;

 import java.time.Duration;
 import java.time.LocalTime;
-import java.time.Period;

 public class UseDuration {

@@ -0,0 +1,23 @@
+package com.baeldung.stream;
+
+import java.util.Arrays;
+import java.util.stream.IntStream;
+
+class PrimitiveStreams {
+
+    int min(int[] integers) {
+        return Arrays.stream(integers).min().getAsInt();
+    }
+
+    int max(int... integers) {
+        return IntStream.of(integers).max().getAsInt();
+    }
+
+    int sum(int... integers) {
+        return IntStream.of(integers).sum();
+    }
+
+    double avg(int... integers) {
+        return IntStream.of(integers).average().getAsDouble();
+    }
+}
@@ -1,8 +1,6 @@
 package com.baeldung.streamApi;

 import java.util.List;
-import java.util.Optional;
-import java.util.stream.IntStream;
 import java.util.stream.Stream;

 /**
@@ -0,0 +1,45 @@
+package com.baeldung.counter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Mode;
+
+import com.baeldung.counter.CounterUtil.MutableInteger;
+
+@Fork(value = 1, warmups = 3)
+@BenchmarkMode(Mode.All)
+public class CounterStatistics {
+
+    private static final Map<String, Integer> counterMap = new HashMap<>();
+    private static final Map<String, MutableInteger> counterWithMutableIntMap = new HashMap<>();
+    private static final Map<String, int[]> counterWithIntArrayMap = new HashMap<>();
+    private static final Map<String, Long> counterWithLongWrapperMap = new HashMap<>();
+
+    @Benchmark
+    public void wrapperAsCounter() {
+        CounterUtil.counterWithWrapperObject(counterMap);
+    }
+
+    @Benchmark
+    public void lambdaExpressionWithWrapper() {
+        CounterUtil.counterWithLambdaAndWrapper(counterWithLongWrapperMap);
+    }
+
+    @Benchmark
+    public void mutableIntegerAsCounter() {
+        CounterUtil.counterWithMutableInteger(counterWithMutableIntMap);
+    }
+
+    @Benchmark
+    public void primitiveArrayAsCounter() {
+        CounterUtil.counterWithPrimitiveArray(counterWithIntArrayMap);
+    }
+
+    public static void main(String[] args) throws Exception {
+        org.openjdk.jmh.Main.main(args);
+    }
+}
@@ -0,0 +1,53 @@
+package com.baeldung.counter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.baeldung.counter.CounterUtil.MutableInteger;
+
+public class CounterTest {
+
+    @Test
+    public void whenMapWithWrapperAsCounter_runsSuccessfully() {
+        Map<String, Integer> counterMap = new HashMap<>();
+        CounterUtil.counterWithWrapperObject(counterMap);
+
+        assertEquals(3, counterMap.get("China")
+            .intValue());
+        assertEquals(2, counterMap.get("India")
+            .intValue());
+    }
+
+    @Test
+    public void whenMapWithLambdaAndWrapperCounter_runsSuccessfully() {
+        Map<String, Long> counterMap = new HashMap<>();
+        CounterUtil.counterWithLambdaAndWrapper(counterMap);
+
+        assertEquals(3l, counterMap.get("China")
+            .longValue());
+        assertEquals(2l, counterMap.get("India")
+            .longValue());
+    }
+
+    @Test
+    public void whenMapWithMutableIntegerCounter_runsSuccessfully() {
+        Map<String, MutableInteger> counterMap = new HashMap<>();
+        CounterUtil.counterWithMutableInteger(counterMap);
+        assertEquals(3, counterMap.get("China")
+            .getCount());
+        assertEquals(2, counterMap.get("India")
+            .getCount());
+    }
+
+    @Test
+    public void whenMapWithPrimitiveArray_runsSuccessfully() {
+        Map<String, int[]> counterMap = new HashMap<>();
+        CounterUtil.counterWithPrimitiveArray(counterMap);
+        assertEquals(3, counterMap.get("China")[0]);
+        assertEquals(2, counterMap.get("India")[0]);
+    }
+}
@@ -0,0 +1,52 @@
+package com.baeldung.counter;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CounterUtil {
+
+    private final static String[] COUNTRY_NAMES = { "China", "Australia", "India", "USA", "USSR", "UK", "China", "France", "Poland", "Austria", "India", "USA", "Egypt", "China" };
+
+    public static void counterWithWrapperObject(Map<String, Integer> counterMap) {
+        for (String country : COUNTRY_NAMES) {
+            counterMap.compute(country, (k, v) -> v == null ? 1 : v + 1);
+        }
+    }
+
+    public static void counterWithLambdaAndWrapper(Map<String, Long> counterMap) {
+        counterMap.putAll(Stream.of(COUNTRY_NAMES)
+            .parallel()
+            .collect(Collectors.groupingBy(k -> k, Collectors.counting())));
+    }
+
+    public static class MutableInteger {
+        int count;
+
+        public MutableInteger(int count) {
+            this.count = count;
+        }
+
+        public void increment() {
+            this.count++;
+        }
+
+        public int getCount() {
+            return this.count;
+        }
+    }
+
+    public static void counterWithMutableInteger(Map<String, MutableInteger> counterMap) {
+        for (String country : COUNTRY_NAMES) {
+            counterMap.compute(country, (k, v) -> v == null ? new MutableInteger(0) : v)
+                .increment();
+        }
+    }
+
+    public static void counterWithPrimitiveArray(Map<String, int[]> counterMap) {
+        for (String country : COUNTRY_NAMES) {
+            counterMap.compute(country, (k, v) -> v == null ? new int[] { 0 } : v)[0]++;
+        }
+    }
+
+}
@@ -4,7 +4,6 @@ import java.time.LocalDate;
 import java.time.LocalTime;
 import java.time.Month;

-import org.junit.Assert;
 import org.junit.Test;

 import static org.junit.Assert.assertEquals;
@@ -4,7 +4,6 @@ import java.time.DayOfWeek;
 import java.time.LocalDate;
 import java.time.LocalDateTime;

-import org.junit.Assert;
 import org.junit.Test;

 import static org.junit.Assert.assertEquals;
@@ -6,7 +6,6 @@ import java.util.Comparator;
 import org.junit.Before;
 import org.junit.Test;

-import lombok.Data;
 import static org.junit.Assert.assertTrue;

 public class Java8ComparatorUnitTest {
@@ -134,8 +133,7 @@ public class Java8ComparatorUnitTest {

    @Test
    public void whenThenComparing_thenSortedByAgeName() {
-        Comparator<Employee> employee_Age_Name_Comparator = Comparator.comparing(Employee::getAge)
-            .thenComparing(Employee::getName);
+        Comparator<Employee> employee_Age_Name_Comparator = Comparator.comparing(Employee::getAge).thenComparing(Employee::getName);

        Arrays.sort(someMoreEmployees, employee_Age_Name_Comparator);
        // System.out.println(Arrays.toString(someMoreEmployees));
@@ -144,8 +142,7 @@ public class Java8ComparatorUnitTest {

    @Test
    public void whenThenComparing_thenSortedByNameAge() {
-        Comparator<Employee> employee_Name_Age_Comparator = Comparator.comparing(Employee::getName)
-            .thenComparingInt(Employee::getAge);
+        Comparator<Employee> employee_Name_Age_Comparator = Comparator.comparing(Employee::getName).thenComparingInt(Employee::getAge);

        Arrays.sort(someMoreEmployees, employee_Name_Age_Comparator);
        // System.out.println(Arrays.toString(someMoreEmployees));
@@ -0,0 +1,96 @@
+package com.baeldung.stream;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class PrimitiveStreamsUnitTest {
+
+    private PrimitiveStreams streams = new PrimitiveStreams();
+
+    @Test
+    public void givenAnArrayOfIntegersWhenMinIsCalledThenCorrectMinIsReturned() {
+        int[] integers = new int[] {20, 98, 12, 7, 35};
+        int min = streams.min(integers); // returns 7
+
+        assertEquals(7, min);
+    }
+
+    @Test
+    public void givenAnArrayOfIntegersWhenMaxIsCalledThenCorrectMaxIsReturned() {
+        int max = streams.max(20, 98, 12, 7, 35);
+
+        assertEquals(98, max);
+    }
+
+    @Test
+    public void givenAnArrayOfIntegersWhenSumIsCalledThenCorrectSumIsReturned() {
+        int sum = streams.sum(20, 98, 12, 7, 35);
+
+        assertEquals(172, sum);
+    }
+
+    @Test
+    public void givenAnArrayOfIntegersWhenAvgIsCalledThenCorrectAvgIsReturned() {
+        double avg = streams.avg(20, 98, 12, 7, 35);
+
+        assertTrue(34.4 == avg);
+    }
+
+    @Test
+    public void givenARangeOfIntegersWhenIntStreamSumIsCalledThenCorrectSumIsReturned() {
+        int sum = IntStream.range(1, 10).sum();
+
+        assertEquals(45, sum);
+    }
+
+    @Test
+    public void givenARangeClosedOfIntegersWhenIntStreamSumIsCalledThenCorrectSumIsReturned() {
+        int sum = IntStream.rangeClosed(1, 10).sum();
+
+        assertEquals(55, sum);
+    }
+
+    @Test
+    public void givenARangeWhenForEachIsCalledThenTheIndicesWillBePrinted() {
+        IntStream.rangeClosed(1, 5).parallel().forEach(System.out::println);
+    }
+
+    @Test
+    public void givenAnArrayWhenSumIsCalledThenTheCorrectSumIsReturned() {
+
+        int sum = Arrays.asList(33,45).stream().mapToInt(a -> a).sum();
+
+        assertEquals(78, sum);
+    }
+
+    @Test
+    public void givenAnIntStreamThenGetTheEvenIntegers() {
+        List<Integer> evenInts = IntStream.rangeClosed(1, 10)
+          .filter(i -> i % 2 == 0)
+          .boxed()
+          .collect(Collectors.toList());
+
+        List<Integer> expected = IntStream.of(2, 4, 6, 8, 10).boxed().collect(Collectors.toList());
+
+        assertEquals(expected, evenInts);
+    }
+
+    class Person {
+        private int age;
+
+        Person(int age) {
+            this.age = age;
+        }
+
+        int getAge() {
+            return age;
+        }
+    }
+}
@@ -1,7 +1,6 @@
 package com.baeldung.temporaladjusters;

 import com.baeldung.temporaladjuster.CustomTemporalAdjuster;
-import org.junit.Assert;
 import org.junit.Test;

 import java.time.LocalDate;
@@ -18,3 +18,4 @@
 - [How to Get All Dates Between Two Dates?](http://www.baeldung.com/java-between-dates)
 - [Java 9 java.util.Objects Additions](http://www.baeldung.com/java-9-objects-new)
 - [Compact Strings in Java 9](http://www.baeldung.com/java-9-compact-string)
+- [Convert Date to LocalDate or LocalDateTime and Back](http://www.baeldung.com/java-date-to-localdate-and-localdatetime)
@@ -0,0 +1,3 @@
+javac --module-path mods -d mods/com.baeldung.httpclient^
+ src/modules/com.baeldung.httpclient/module-info.java^
+ src/modules/com.baeldung.httpclient/com/baeldung/httpclient/HttpClientExample.java
@@ -0,0 +1 @@
+java --module-path mods -m com.baeldung.httpclient/com.baeldung.httpclient.HttpClientExample
@@ -0,0 +1,84 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.httpclient;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+import jdk.incubator.http.HttpClient;
+import jdk.incubator.http.HttpRequest;
+import jdk.incubator.http.HttpRequest.BodyProcessor;
+import jdk.incubator.http.HttpResponse;
+import jdk.incubator.http.HttpResponse.BodyHandler;
+
+/**
+ *
+ * @author pkaria
+ */
+public class HttpClientExample {
+    
+    public static void main(String[] args) throws Exception {
+        httpGetRequest();
+        httpPostRequest();
+        asynchronousRequest();
+        asynchronousMultipleRequests();
+    }
+
+    public static void httpGetRequest() throws URISyntaxException, IOException, InterruptedException {
+        HttpClient client = HttpClient.newHttpClient();
+        URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
+        HttpRequest request = HttpRequest.newBuilder(httpURI).GET()
+          .headers("Accept-Enconding", "gzip, deflate").build();
+        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandler.asString());
+        String responseBody = response.body();
+        int responseStatusCode = response.statusCode();
+        System.out.println(responseBody);
+    }
+
+    public static void httpPostRequest() throws URISyntaxException, IOException, InterruptedException {
+        HttpClient client = HttpClient
+                .newBuilder()
+                .build();
+        HttpRequest request = HttpRequest
+                .newBuilder(new URI("http://jsonplaceholder.typicode.com/posts"))
+                .POST(BodyProcessor.fromString("Sample Post Request"))
+                .build();
+        HttpResponse<String> response
+                = client.send(request, HttpResponse.BodyHandler.asString());
+        String responseBody = response.body();
+        System.out.println(responseBody);
+    }
+
+    public static void asynchronousRequest() throws URISyntaxException {
+        HttpClient client = HttpClient.newHttpClient();
+        URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
+        HttpRequest request = HttpRequest.newBuilder(httpURI).GET().build();
+        CompletableFuture<HttpResponse<String>> futureResponse = client.sendAsync(request,
+                HttpResponse.BodyHandler.asString());
+    }
+
+    public static void asynchronousMultipleRequests() throws URISyntaxException {
+        List<URI> targets = Arrays.asList(new URI("http://jsonplaceholder.typicode.com/posts/1"), new URI("http://jsonplaceholder.typicode.com/posts/2"));
+        HttpClient client = HttpClient.newHttpClient();
+        List<CompletableFuture<File>> futures = targets
+                .stream()
+                .map(target -> client
+                .sendAsync(
+                        HttpRequest.newBuilder(target)
+                                .GET()
+                                .build(),
+                        BodyHandler.asFile(Paths.get("base", target.getPath())))
+                .thenApply(response -> response.body())
+                .thenApply(path -> path.toFile()))
+                .collect(Collectors.toList());
+    }
+}
@@ -0,0 +1,3 @@
+module com.baeldung.httpclient {   
+	requires jdk.incubator.httpclient;
+}
@@ -0,0 +1,106 @@
+package com.baeldung.java9.varhandles;
+
+import org.junit.Test;
+
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.VarHandle;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class VariableHandlesTest {
+
+    public int publicTestVariable = 1;
+    private int privateTestVariable = 1;
+    public int variableToSet = 1;
+    public int variableToCompareAndSet = 1;
+    public int variableToGetAndAdd = 0;
+    public byte variableToBitwiseOr = 0;
+
+    @Test
+    public void whenVariableHandleForPublicVariableIsCreated_ThenItIsInitializedProperly() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle publicIntHandle = MethodHandles
+          .lookup()
+          .in(VariableHandlesTest.class)
+          .findVarHandle(VariableHandlesTest.class, "publicTestVariable", int.class);
+
+        assertThat(publicIntHandle.coordinateTypes().size() == 1);
+        assertThat(publicIntHandle.coordinateTypes().get(0) == VariableHandles.class);
+
+    }
+
+    @Test
+    public void whenVariableHandleForPrivateVariableIsCreated_ThenItIsInitializedProperly() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle privateIntHandle = MethodHandles
+          .privateLookupIn(VariableHandlesTest.class, MethodHandles.lookup())
+          .findVarHandle(VariableHandlesTest.class, "privateTestVariable", int.class);
+
+        assertThat(privateIntHandle.coordinateTypes().size() == 1);
+        assertThat(privateIntHandle.coordinateTypes().get(0) == VariableHandlesTest.class);
+
+    }
+
+    @Test
+    public void whenVariableHandleForArrayVariableIsCreated_ThenItIsInitializedProperly() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle arrayVarHandle = MethodHandles
+          .arrayElementVarHandle(int[].class);
+
+        assertThat(arrayVarHandle.coordinateTypes().size() == 2);
+        assertThat(arrayVarHandle.coordinateTypes().get(0) == int[].class);
+    }
+
+    @Test
+    public void givenVarHandle_whenGetIsInvoked_ThenValueOfVariableIsReturned() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle publicIntHandle = MethodHandles
+          .lookup()
+          .in(VariableHandlesTest.class)
+          .findVarHandle(VariableHandlesTest.class, "publicTestVariable", int.class);
+
+        assertThat((int) publicIntHandle.get(this) == 1);
+    }
+
+    @Test
+    public void givenVarHandle_whenSetIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle publicIntHandle = MethodHandles
+          .lookup()
+          .in(VariableHandlesTest.class)
+          .findVarHandle(VariableHandlesTest.class, "variableToSet", int.class);
+        publicIntHandle.set(this, 15);
+
+        assertThat((int) publicIntHandle.get(this) == 15);
+    }
+
+    @Test
+    public void givenVarHandle_whenCompareAndSetIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle publicIntHandle = MethodHandles
+          .lookup()
+          .in(VariableHandlesTest.class)
+          .findVarHandle(VariableHandlesTest.class, "variableToCompareAndSet", int.class);
+        publicIntHandle.compareAndSet(this, 1, 100);
+
+        assertThat((int) publicIntHandle.get(this) == 100);
+    }
+
+    @Test
+    public void givenVarHandle_whenGetAndAddIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle publicIntHandle = MethodHandles
+          .lookup()
+          .in(VariableHandlesTest.class)
+          .findVarHandle(VariableHandlesTest.class, "variableToGetAndAdd", int.class);
+        int before = (int) publicIntHandle.getAndAdd(this, 200);
+
+        assertThat(before == 0);
+        assertThat((int) publicIntHandle.get(this) == 200);
+    }
+
+    @Test
+    public void givenVarHandle_whenGetAndBitwiseOrIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
+        VarHandle publicIntHandle = MethodHandles
+          .lookup()
+          .in(VariableHandlesTest.class)
+          .findVarHandle(VariableHandlesTest.class, "variableToBitwiseOr", byte.class);
+        byte before = (byte) publicIntHandle.getAndBitwiseOr(this, (byte) 127);
+
+        assertThat(before == 0);
+        assertThat(variableToBitwiseOr == 127);
+    }
+}
@@ -31,3 +31,5 @@
 - [Overview of the java.util.concurrent](http://www.baeldung.com/java-util-concurrent)
 - [Semaphores in Java](http://www.baeldung.com/java-semaphore)
 - [Daemon Threads in Java](http://www.baeldung.com/java-daemon-thread)
+- [Implementing a Runnable vs Extending a Thread](http://www.baeldung.com/java-runnable-vs-extending-thread)
+- [How to Kill a Java Thread](http://www.baeldung.com/java-thread-stop)
@@ -0,0 +1,33 @@
+package com.baeldung.concurrent.waitandnotify;
+
+public class Data {
+    private String packet;
+    
+    // True if receiver should wait
+    // False if sender should wait
+    private boolean transfer = true;
+ 
+    public synchronized String receive() {
+        while (transfer) {
+            try {
+                wait();
+            } catch (InterruptedException e) {}
+        }
+        transfer = true;
+
+        notifyAll();
+        return packet;
+    }
+ 
+    public synchronized void send(String packet) {
+        while (!transfer) {
+            try { 
+                wait();
+            } catch (InterruptedException e) {}
+        }
+        transfer = false;
+        
+        this.packet = packet;
+        notifyAll();
+    }
+}
@@ -0,0 +1,12 @@
+package com.baeldung.concurrent.waitandnotify;
+
+public class NetworkDriver {
+    public static void main(String[] args) {
+        Data data = new Data();
+        Thread sender = new Thread(new Sender(data));
+        Thread receiver = new Thread(new Receiver(data));
+        
+        sender.start();
+        receiver.start();
+    }
+}
@@ -0,0 +1,25 @@
+package com.baeldung.concurrent.waitandnotify;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+public class Receiver implements Runnable {
+    private Data load;
+ 
+    public Receiver(Data load) {
+        this.load = load;
+    }
+ 
+    public void run() {
+        for(String receivedMessage = load.receive();
+          !"End".equals(receivedMessage) ;
+          receivedMessage = load.receive()) {
+            
+            System.out.println(receivedMessage);
+
+            //Thread.sleep() to mimic heavy server-side processing
+            try {
+                Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 5000));
+            } catch (InterruptedException e) {}
+        }
+    }
+}
@@ -0,0 +1,30 @@
+package com.baeldung.concurrent.waitandnotify;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+public class Sender implements Runnable {
+    private Data data;
+ 
+    public Sender(Data data) {
+        this.data = data;
+    }
+ 
+    public void run() {
+        String packets[] = {
+            "First packet",
+            "Second packet",
+            "Third packet",
+            "Fourth packet",
+            "End"
+        };
+ 
+        for (String packet : packets) {
+            data.send(packet);
+            
+            //Thread.sleep() to mimic heavy server-side processing
+            try {
+                Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 5000));
+            } catch (InterruptedException e) {}
+        }
+    }
+}
@@ -9,11 +9,10 @@ import java.util.List;
 import java.util.concurrent.*;

 import static junit.framework.TestCase.assertTrue;
-import static org.junit.Assert.fail;

-public class WaitingForThreadsToFinishTest {
+public class WaitingForThreadsToFinishManualTest {

-    private static final Logger LOG = LoggerFactory.getLogger(WaitingForThreadsToFinishTest.class);
+    private static final Logger LOG = LoggerFactory.getLogger(WaitingForThreadsToFinishManualTest.class);
    private final static ExecutorService WORKER_THREAD_POOL = Executors.newFixedThreadPool(10);

    public void awaitTerminationAfterShutdown(ExecutorService threadPool) {
@@ -40,16 +39,13 @@ public class WaitingForThreadsToFinishTest {
            CountDownLatch latch = new CountDownLatch(2);
            
            for (int i = 0; i < 2; i++) {
-                WORKER_THREAD_POOL.submit(new Runnable() {                
-                    @Override
-                    public void run() {
-                        try {
-                            Thread.sleep(1000);
-                            latch.countDown();
-                        } catch (InterruptedException e) {
-                            e.printStackTrace();
-                            Thread.currentThread().interrupt();
-                        }
+                WORKER_THREAD_POOL.submit(() -> {
+                    try {
+                        Thread.sleep(1000);
+                        latch.countDown();
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                        Thread.currentThread().interrupt();
                    }
                });
            }
@@ -83,13 +79,9 @@ public class WaitingForThreadsToFinishTest {
            awaitTerminationAfterShutdown(WORKER_THREAD_POOL);

            try {
-                WORKER_THREAD_POOL.submit(new Callable<String>() {
-                    @Override
-                    public String call() throws Exception {
-                        fail("This thread should have been rejected !");
-                        Thread.sleep(1000000);
-                        return null;
-                    }
+                WORKER_THREAD_POOL.submit((Callable<String>) () -> {
+                    Thread.sleep(1000000);
+                    return null;
                });
            } catch (RejectedExecutionException ex) {
                //
@@ -150,66 +142,4 @@ public class WaitingForThreadsToFinishTest {
            awaitTerminationAfterShutdown(WORKER_THREAD_POOL);
        }
    }
-
-    @Test
-    public void givenMultipleThreads_whenUsingCompletableFutures_thenMainThreadShouldWaitForAllToFinish() {
-
-        CompletableFuture<String> future1 = CompletableFuture.supplyAsync(() -> {
-
-            try {
-                Thread.sleep(1000);
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
-
-            return "Hello";
-        });
-
-        CompletableFuture<String> future2 = CompletableFuture.supplyAsync(() -> {
-
-            try {
-                Thread.sleep(5000);
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
-
-            return "Beautiful";
-        });
-
-        CompletableFuture<String> future3 = CompletableFuture.supplyAsync(() -> {
-
-            try {
-                Thread.sleep(3000);
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
-
-            return "World";
-        });
-
-        long startProcessingTime = System.currentTimeMillis();
-        CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(future1, future2, future3);
-        combinedFuture.join();
-
-        long totalProcessingTime = System.currentTimeMillis() - startProcessingTime;
-        assertTrue(totalProcessingTime >= 5000 && totalProcessingTime < 6000);
-
-        LOG.debug("Responses from all threads are available after " + totalProcessingTime + " milliseconds");
-
-        try {
-            String thread1Response = future1.get();
-            assertTrue(thread1Response.equals("Hello"));
-
-            String thread2Response = future2.get();
-            assertTrue(thread2Response.equals("Beautiful"));
-
-            String thread3Response = future3.get();
-            assertTrue(thread3Response.equals("World"));
-
-        } catch (InterruptedException | ExecutionException e) {
-            e.printStackTrace();
-        }
-
-        awaitTerminationAfterShutdown(WORKER_THREAD_POOL);
-    }
 }
@@ -0,0 +1,65 @@
+package com.baeldung.concurrent.waitandnotify;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class NetworkIntegrationTest {
+
+	private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+	private final ByteArrayOutputStream errContent = new ByteArrayOutputStream();
+	private String expected;
+	
+	@Before
+	public void setUpStreams() {
+	    System.setOut(new PrintStream(outContent));
+	    System.setErr(new PrintStream(errContent));
+	}
+	
+	@Before
+	public void setUpExpectedOutput() {
+		StringWriter expectedStringWriter = new StringWriter();
+		
+		PrintWriter printWriter = new PrintWriter(expectedStringWriter);
+		printWriter.println("First packet");
+		printWriter.println("Second packet");
+		printWriter.println("Third packet");
+		printWriter.println("Fourth packet");
+		printWriter.close();
+		
+		expected = expectedStringWriter.toString();
+	}
+
+	@After
+	public void cleanUpStreams() {
+	    System.setOut(null);
+	    System.setErr(null);
+	}
+	
+	@Test
+	public void givenSenderAndReceiver_whenSendingPackets_thenNetworkSynchronized() {
+        Data data = new Data();
+        Thread sender = new Thread(new Sender(data));
+        Thread receiver = new Thread(new Receiver(data));
+        
+        sender.start();
+        receiver.start();
+        
+        //wait for sender and receiver to finish before we test against expected
+        try {
+			sender.join();
+			receiver.join();
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
+		
+	    assertEquals(expected, outContent.toString());
+	}
+}
@@ -120,4 +120,10 @@
 - [Guide to Java String Pool](http://www.baeldung.com/java-string-pool)
 - [Copy a File with Java](http://www.baeldung.com/java-copy-file)
 - [Introduction to Creational Design Patterns](http://www.baeldung.com/creational-design-patterns)
-
+- [Quick Example - Comparator vs Comparable in Java](http://www.baeldung.com/java-comparator-comparable)
+- [Quick Guide to Java Stack](http://www.baeldung.com/java-stack)
+- [The Java continue and break Keywords](http://www.baeldung.com/java-continue-and-break)
+- [Java – Append Data to a File](http://www.baeldung.com/java-append-to-file)
+- [Introduction to the Java ArrayDeque](http://www.baeldung.com/java-array-deque)
+- [Guide to java.util.Formatter](http://www.baeldung.com/java-string-formatter)
+- [Batch Processing in JDBC](http://www.baeldung.com/jdbc-batch-processing)
--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
				`java --module-path mods -m com.baeldung.httpclient/com.baeldung.httpclient.HttpClientExample`