Java Concurrency Multithreading

Tue, 23 Jul 2024 20:25:44 -0400

Thread

Here is an example of creating a Java Thread subclass:

public class MyThread extends Thread {
 public void run(){
 System.out.println("MyThread running");
 }
}

To create and start the above thread you can do like this:

MyThread myThread = new MyThread();
myTread.start();

You can also create an anonymous subclass of Thread like this:

Thread thread = new Thread(){
 public void run(){
 System.out.println("Thread Running");
 }
}

thread.start();

public class MyRunnable implements Runnable {
 public void run(){
 System.out.println("MyRunnable running");
 }
}

Runnable myRunnable =
 new Runnable(){
 public void run(){
 System.out.println("Runnable running");
 }
 }

Runnable runnable =
 () -> { System.out.println("Lambda Runnable running"); };

Runnable runnable = new MyRunnable(); // or an anonymous class, or lambda...

Thread thread = new Thread(runnable);
thread.start();

Here is a diagram illustrating the call stack and local variables stored on the thread stacks, and objects stored on the heap: