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Threads

Besides the main thread, developers can instantiate their own when:

1. A custom class extends the Thread class
2. A Thread is passed an implemented Runnable instance

Override the run() method in both cases to define the program to be run concurrently in the new thread, then call the Thread instance’s start() method.

Extend Thread

public class CustomThread extends Thread {
    @Override
    public void run() {
        // Do something
    }

    public static void main(String[] args) {
        new CustomThread().start();
    }
}

Implement Runnable

public class CustomRunnable implements Runnable {
    @Override
    public void run() {
        // Do something
    }

    public static void main(String[] args) {
        new Thread(new CustomRunnable()).start();
    }
}

Anonymous Runnable Class

new Thread(new Runnable() {
        public void run() {
            // Do something
        }
    }).start();

Runnable Lambda

new Thread(
    () -> { /* Do something */ };
    ).start();

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