106 hello thread exercise demo

7-0-java-concurrency/7-0-0-hello-threads/README.md

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+# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>Java concurrency
+Start learning concurrency in Java by writing simple functions using Threads 💪
+
+### Objectives
+TODO
+#### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-course/tree/main/0-0-intro#introduction)
+#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/TPSCpZAMZvNXYCoA6)

7-0-java-concurrency/7-0-0-hello-threads/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-fundamentals-course</artifactId>
+        <groupId>com.bobocode</groupId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>7-0-0-hello-theads</artifactId>
+    <dependencies>
+        <dependency>
+            <groupId>com.bobocode</groupId>
+            <artifactId>java-fundamentals-util</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <maven.compile.targer>11</maven.compile.targer>
+        <maven.compile.source>11</maven.compile.source>
+    </properties>
+</project>

7-0-java-concurrency/7-0-0-hello-threads/src/main/java/HelloThreads.java

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+import com.bobocode.util.ExerciseNotCompletedException;
+import lombok.SneakyThrows;
+
+import java.util.List;
+
+public class HelloThreads {
+    /**
+     * Receives a {@link Runnable} parameter, and returns a {@link Thread}.
+     * @param runnable the code you want to run in new thread
+     * @return a new thread
+     */
+    public static Thread runningThread(Runnable runnable) {
+        throw new ExerciseNotCompletedException();
+    }
+
+    /**
+     * Receive a {@link Thread} parameter and start it
+     * @param thread the code you want to start thread
+     */
+    public static void runningThreadViaStart(Thread thread) {
+        throw new ExerciseNotCompletedException();
+    }
+
+    /**
+     * Receives a {@link Thread} parameter, and return a {@link String}
+     * @param thread the code you want start thread and return tread name
+     * @return the name thread
+     */
+    public static String runningThreadGetNameThread(Thread thread) {
+        throw new ExerciseNotCompletedException();
+    }
+
+    /**
+     * Receives a {@link Thread} parameter, and return a {@link Thread.State}
+     * @param thread the code you want start thread and return state
+     * @return the thread state
+     */
+    public static Thread.State runningThreadGetStateThread(Thread thread) {
+        throw new ExerciseNotCompletedException();
+    }
+
+    /**
+     * Receives a {@link Runnable} parameter, create new {@link Thread}, start and return this {@link Thread}
+     * @param runnable the code you want to run in new thread and start
+     * @return this thread
+     */
+    public static Thread getSomeLogicRunningTreadAndReturnThisThread(Runnable runnable) {
+        throw new ExerciseNotCompletedException();
+    }
+
+    /**
+     * Receives a {@link Runnable} parameter, create new {@link Thread}, start and wait when it has completed
+     * @param runnable - the code you want to run in new thread and start
+     */
+    @SneakyThrows
+    public static void runningThreadAndWhenJoinCompleted(Runnable runnable) {
+        throw new ExerciseNotCompletedException();
+    }
+
+    /**
+     * Receives a {@link Runnable} parameter, create three new {@link Thread} start it,
+     * and return list of threads that are in progress
+     * @param runnable the code you want to run in new thread and start
+     * @return list these threads
+     */
+    @SneakyThrows
+    public static List<Thread> runningMultipleThreadsWithOneTask(Runnable runnable) {
+        throw new ExerciseNotCompletedException();
+    }
+}

7-0-java-concurrency/7-0-0-hello-threads/src/test/java/HelloThreadsTest.java

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+import lombok.SneakyThrows;
+import org.junit.jupiter.api.*;
+
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.ThreadLocalRandom;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+class HelloThreadsTest {
+
+    private Queue<Integer> concurrentLinkedQueue;
+
+    @BeforeEach
+    void prepare() {
+        concurrentLinkedQueue = new ConcurrentLinkedQueue<>();
+    }
+
+    @SneakyThrows
+    @Test
+    @Order(1)
+    void runningThread() {
+        Thread runningThread = HelloThreads.runningThread(() -> concurrentLinkedQueue.add(5));
+        assertEquals(0, concurrentLinkedQueue.size());
+
+        runningThread.start();
+        runningThread.join();
+
+        checkContentQueue();
+    }
+
+    @SneakyThrows
+    @Test
+    @Order(2)
+    void runningThreadViaStart() {
+        var thread = new Thread(() -> concurrentLinkedQueue.add(5));
+        HelloThreads.runningThreadViaStart(thread);
+        thread.join();
+
+        checkContentQueue();
+    }
+
+    @SneakyThrows
+    @Test
+    @Order(3)
+    void runningThreadGetNameThread() {
+        var thread = new Thread(() -> concurrentLinkedQueue.add(5), "name");
+        var threadName = HelloThreads.runningThreadGetNameThread(thread);
+        thread.join();
+        assertEquals("name", threadName);
+
+        checkContentQueue();
+    }
+
+    @SneakyThrows
+    @Test
+    @Order(3)
+    void runningThreadGetStateThread() {
+        var thread = new Thread(() -> concurrentLinkedQueue.add(5));
+        var state = HelloThreads.runningThreadGetStateThread(thread);
+        thread.join();
+        assertSame(state, Thread.State.RUNNABLE);
+
+        checkContentQueue();
+    }
+
+    @SneakyThrows
+    @Test
+    @Order(4)
+    void getSomeLogicRunningTreadAndReturnThisThread()  {
+        var thread = HelloThreads.getSomeLogicRunningTreadAndReturnThisThread(new Thread(() -> {
+            assertEquals(0, concurrentLinkedQueue.size());
+            concurrentLinkedQueue.add(5);
+        }));
+        thread.join();
+
+        checkContentQueue();
+    }
+
+    @SneakyThrows
+    @Test
+    @Order(5)
+    void runningThreadAndWhenJoinCompleted()  {
+        HelloThreads.runningThreadAndWhenJoinCompleted(new Thread(() -> {
+            assertEquals(0, concurrentLinkedQueue.size());
+            concurrentLinkedQueue.add(5);
+        }));
+
+        checkContentQueue();
+    }
+
+    @SneakyThrows
+    @Test
+    @Order(6)
+    void runningMultipleThreadsWithOneTask()  {
+        HelloThreads.runningMultipleThreadsWithOneTask(new Thread(() ->
+                concurrentLinkedQueue.add(ThreadLocalRandom.current().nextInt(100))));
+        assertEquals(3, concurrentLinkedQueue.size());
+    }
+
+    private void checkContentQueue() {
+        assertEquals(1, concurrentLinkedQueue.size());
+        assertEquals(5, concurrentLinkedQueue.element().intValue());
+    }
+}

7-0-java-concurrency/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-fundamentals-course</artifactId>
+        <groupId>com.bobocode</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>7-0-java-concurrency</artifactId>
+    <properties>
+        <maven.compile.targer>11</maven.compile.targer>
+        <maven.compile.source>11</maven.compile.source>
+    </properties>
+</project>

pom.xml

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         <module>6-0-test-driven-development</module>
         <module>java-fundamentals-util</module>
         <module>lesson-demo</module>
+        <module>7-0-java-concurrency</module>
+        <module>7-0-java-concurrency/7-0-0-hello-threads</module>
     </modules>
 
     <dependencies>