SuspendResume.java

// Suspending and resuming a thread the modern way.
class NewThreadSR implements Runnable {
    String name; // name of thread
    Thread t;
    boolean suspendFlag;

    NewThreadSR(String threadName) {
        name = threadName;
        t = new Thread(this, name);
        System.out.println("New thread: " + t);
        suspendFlag = false;
        t.start(); // Start the thread
    }

    // This is the entry point for thread.
    public void run() {
        try {
            for(int i = 15; i > 0; i--) {
                System.out.println(name + ": " + i);
                Thread.sleep(200);
                synchronized(this) {
                    while(suspendFlag) {
                        wait();
                    } }
            }
        } catch (InterruptedException e) {
            System.out.println(name + " interrupted.");
        }
        System.out.println(name + " exiting.");
    }

    synchronized void mySuspend() {
        suspendFlag = true;
    }

    synchronized void myResume() {
        suspendFlag = false;
        notify();
    } }

public class SuspendResume {
    public static void main(String[] args) {
        NewThreadSR ob1 = new NewThreadSR("One");
        NewThreadSR ob2 = new NewThreadSR("Two");

        try {
            Thread.sleep(1000);
            ob1.mySuspend();
            System.out.println("Suspending thread One");
            Thread.sleep(1000);
            ob1.myResume();
            System.out.println("Resuming thread One");
            ob2.mySuspend();
            System.out.println("Suspending thread Two");
            Thread.sleep(1000);
            ob2.myResume();
            System.out.println("Resuming thread Two");
        } catch (InterruptedException e) {
            System.out.println("Main thread Interrupted");
        }

        // wait for threads to finish
        try {
            System.out.println("Waiting for threads to finish.");
            ob1.t.join();
            ob2.t.join();
        } catch (InterruptedException e) {
            System.out.println("Main thread Interrupted");
        }

        System.out.println("Main thread exiting.");
    }
}