Q18.java

class Callme {
    void call(String msg, int t) {
        System.out.println(msg);
        try {
            Thread.sleep(t * 1000);
        } catch (InterruptedException e) {
            System.out.println("Interrupted");
        }
    }
}
class Caller extends Thread {
    String msg;
    int time;
    Callme target;
    public Caller(Callme targ, String s, int et) {
        target = targ;
        msg = s;
        time = et;
        this.start();
    }
    public void run() {
        int i;
        for (i = 1; i <= 5; i++) {
            synchronized (target) {
                target.call(msg, time);
            }
        }
    }
}
class Main {
    public static void main(String args[]) {
        Callme target = new Callme();
        Caller ob1 = new Caller(target, "GOOD MORNING", 1);
        Caller ob2 = new Caller(target, "HELLO", 2);
        Caller ob3 = new Caller(target, "WELCOME", 3);
        try {
            ob1.join();
            ob2.join();
            ob3.join();
        } catch (InterruptedException e) {
            System.out.println("Interrupted");
        }
    }
}