Program to print even and odd numbers using two threads

package JavaBuzz.Threadmania;

class PrintEvenNumbersTask implements Runnable {

private Object lock;

public PrintEvenNumbersTask(Object lock) {

    this.lock = lock;

}

@Override

public void run() {

    synchronized (lock) {

        for (int i = 0; i <= 10; i += 2) {

            lock.notify();

            System.out.println("Even : "+i);

            try {

                lock.wait();

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        lock.notify(); // not required if thread1 gains lock first

    }

}

}

class PrintOddNumbersTask implements Runnable {

private Object lock;

public PrintOddNumbersTask(Object lock) {

    this.lock = lock;

}

@Override

public void run() {

    synchronized (lock) {

        for (int i = 1; i < 10; i += 2) {

            lock.notify();

            System.out.println("Odd : "+i);

            try {

                lock.wait();

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        lock.notify();

    }

}

}

public class EvenOddThreads {

public static void main(String[] args) {

    Object lock = new Object();

    PrintEvenNumbersTask printEvenNumberstask = new PrintEvenNumbersTask(lock);

    PrintOddNumbersTask printOddNumberstask = new PrintOddNumbersTask(lock);

    Thread thread1 = new Thread(printEvenNumberstask);

    Thread thread2 = new Thread(printOddNumberstask);

    thread2.start();

    thread1.start();

}

}

Output : 

Odd : 1

Even : 0

Odd : 3

Even : 2

Odd : 5

Even : 4

Odd : 7

Even : 6

Odd : 9

Even : 8

Even : 10