Synch.java

package chapter11;

//This program is not synchronized

class Callme {
    synchronized void call(String msg) {
        System.out.print(" [" + msg);
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            System.out.println("Interrupted");
        }
        System.out.println("] ");
    }
}

class Caller implements Runnable {

    String msg;
    Callme target;
    Thread t;

    public Caller(Callme targ, String s) {
        target = targ;
        msg = s;
        t = new Thread(this);
    }


    public void run() {
        target.call(msg);
    }
}

public class Synch {
    public static void main(String[] args) {

        Callme target = new Callme();
        Caller ob1 = new Caller(target, "Hello");
        Caller ob2 = new Caller(target, "Synchronized");
        Caller ob3 = new Caller(target, "World");

        //Start the threads..
        ob1.t.start();
        ob2.t.start();
        ob3.t.start();

        //Wait for threads to end
        try {
            ob1.t.join();
            ob2.t.join();
            ob3.t.join();

        } catch (InterruptedException e) {
            System.out.println("Interrupted");
        }


    }
}