update ThreadIsCool class

fishercoder1534 · fishercoder1534 · commit 36bfaf742f66 · 2024-02-04T16:00:46.000-08:00
diff --git a/src/main/java/multithread/ThreadIsCool.java b/src/main/java/multithread/ThreadIsCool.java
@@ -1,59 +1,70 @@
 package multithread;
 
-/** This is a cool and small program to show that threads don't run in the order that you can control, it's all scheduled by the thing called
- * Thread Scheduler.*/
-
-public class ThreadIsCool implements Runnable{
-
-	public static void main(String [] args){
-		ThreadIsCool threadIsCool = new ThreadIsCool();
-		Thread thread1 = new Thread(threadIsCool);
-		Thread thread2 = new Thread(threadIsCool);
-		Thread thread3 = new Thread(threadIsCool);
-		thread1.setName("Thread Andrew");
-		thread2.setName("Thread James");
-		thread3.setName("Thread Steve");
-		System.out.println("Now the three threads kick off:");
-		
-		thread1.start();
-		try {
-		    /* Wait for this thread to die before other invocations*/
+/**
+ * This is a cool and small program to show that threads run order could be controlled by using Thread.join() method.
+ */
+
+public class ThreadIsCool implements Runnable {
+
+    public static void main(String[] args) {
+        ThreadIsCool threadIsCool = new ThreadIsCool();
+        Thread thread1 = new Thread(threadIsCool);
+        Thread thread2 = new Thread(threadIsCool);
+        Thread thread3 = new Thread(threadIsCool);
+        Thread thread4 = new Thread(threadIsCool);
+        thread1.setName("Thread 1");
+        thread2.setName("Thread 2");
+        thread3.setName("Thread 3");
+        thread4.setName("Thread 4");
+        System.out.println("Now all the threads are about to kick off:");
+
+        thread1.start();
+        try {
+            /* Wait for this thread to die before other invocations*/
             thread1.join();
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
-		
-		thread2.start();
-		try {
-			/* Wait for this thread to die before other invocations*/
+
+        thread2.start();
+        try {
+            /* Wait for this thread to die before other invocations*/
             thread2.join();
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
-		
-		thread3.start();
-		try {
-			/* Wait for this thread to die before other invocations*/
+
+        thread3.start();
+        try {
+            /* Wait for this thread to die before other invocations*/
             thread3.join();
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
-		System.out.println("Now the Program ended.");
-	}
-	
-	@Override
-	public void run(){
-		for(int i = 0; i < 10; i++){
-			String threadName = Thread.currentThread().getName();
-			System.out.println(threadName + " is running!");
-		}
-		System.out.println(Thread.currentThread().getName() + " is sleeping for 3 seconds");
-		try {
-            Thread.sleep(3000);
+
+        thread4.start();
+        try {
+            /* Wait for this thread to die before other invocations*/
+            thread4.join();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        System.out.println("Now the Program ended.");
+    }
+
+    @Override
+    public void run() {
+        for (int i = 0; i < 10; i++) {
+            String threadName = Thread.currentThread().getName();
+            System.out.println(threadName + " is running!");
+        }
+        System.out.println(Thread.currentThread().getName() + " is sleeping for 1 second");
+        try {
+            Thread.sleep(1000);
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
-		System.out.println(Thread.currentThread().getName() + " run finished.");
-	}
-	
+        System.out.println(Thread.currentThread().getName() + " run finished.");
+    }
+
 }
