Inter thread Communication

wait() -causes current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object

public void notify() -Wakes up a single thread that is waiting on this object's monitor.

public void notifyAll() -Wakes up all the threads that called wait( ) on the same object.

class student extends Thread {
    int amount = 1000;

    void withdraw ( int amount ) {
        synchronized (this) {
            System.out.println("Withdrawing..." + amount);

            if (this.amount < amount) {
                System.out.println("Low balance...." + this.amount);

                try {
                    wait();
                } catch (Exception e) {
                }
            }//if ends
            this.amount = this.amount - amount;
            System.out.println("withdraw completed " + amount);
            System.out.println("Balance" + this.amount);
        }
    }

    synchronized void deposit ( int amount ) {
        System.out.println("going to deposit..." + amount);
        this.amount = this.amount + amount;
        System.out.println("update balance deposit completed... " + this.amount);
        notify();
    }
}  // student ends


class interth {
    public static void main ( String[] args ) {
        student s = new student();
        new Thread() {
            public void run () {
                s.withdraw(1500);
            }
        }.start();
        new Thread() {
            public void run () {
                s.deposit(1000);
            }
        }.start();

    }
}

Output:

Withdrawing...1500
Low balance....1000
going to deposit...1000
update balance deposit completed... 2000
withdraw completed 1500
Balance500