Print1To10UsingVolatileBoolean

Test.java

public class Test {

    private static Object object = new Object();
    //private static AtomicBoolean isOddTurn = new AtomicBoolean(true);

    private volatile Boolean isOddTurn = Boolean.TRUE;

    public static void main(String[] args) {
        Test test = new Test();
        test.runDemo();
    }

    public void runDemo() {
        OddPrinter oddPrinter = new OddPrinter(isOddTurn, object);
        EvenPrinter evenPrinter = new EvenPrinter(isOddTurn, object);
        new Thread(oddPrinter).start();
        new Thread(evenPrinter).start();
    }

    class OddPrinter implements Runnable {

        private int counter = 1;

        private Boolean isOddTurn;

        private Object object;

        OddPrinter(Boolean isOddTurn, Object object) {
            this.isOddTurn = isOddTurn;
            this.object = object;
            System.out.println("Odd");
            System.out.println(this.isOddTurn.hashCode());
            System.out.println(isOddTurn.hashCode());
        }

        @Override
        public void run() {
            synchronized (object) {
                while (counter <= 10) {
                    while (!isOddTurn) {
                        try {
                            object.wait();
                        } catch (InterruptedException e) {
                            throw new RuntimeException(e);
                        }
                    }
                    System.out.println(counter);
                    counter += 2;
                    isOddTurn=Boolean.FALSE;
                    object.notify();
                }
            }
        }
    }

    class EvenPrinter implements Runnable {

        private int counter = 2;

        private Object object;
        private Boolean isOddTurn;

        EvenPrinter(Boolean isOddTurn, Object object) {
            this.isOddTurn = isOddTurn;
            this.object = object;
            System.out.println("Evem");
            System.out.println(this.isOddTurn.hashCode());
            System.out.println(isOddTurn.hashCode());
        }

        @Override
        public void run() {
            synchronized (object) {
                while (counter <= 10) {
                    while (isOddTurn) {
                        try {
                            object.wait();
                        } catch (InterruptedException e) {
                            throw new RuntimeException(e);
                        }
                    }
                    System.out.println(counter);
                    counter += 2;
                    isOddTurn=Boolean.TRUE;
                    object.notify();
                }
            }
        }
    }
}