deadlock.java

class A
{
    synchronized void foo(B b)
    {
        String name = Thread.currentThread().getName();
        System.out.println(name + " entered A.foo");

        try{Thread.sleep(1000);}
        catch(Exception e)
            { System.out.println("A Interrupted");  }

    System.out.println(name + " trying to call B.last()");
    b.last();

    }

    synchronized void  last()
    {
        System.out.println("Inside a.last");
    }
}   //close class A

class B
{
    synchronized void bar(A a)
    {
        String name = Thread.currentThread().getName();
        System.out.println(name + " entered B.bar");

        try{Thread.sleep(1000);}
        catch(Exception e)
            { System.out.println("B Interrupted");  }

    System.out.println(name + " trying to call A.last()");
    a.last();

    }
    synchronized void  last()
    {
        System.out.println("Inside A.last");
    }
}   //close class B


class Deadlock implements Runnable{

    A a = new A();
    B b = new B();

    Deadlock(){
            Thread.currentThread().setName("MainThread");
            Thread t = new Thread(this, "RacingThread");
            t.start();

            a.foo(b);   //lock on a in this thread
            System.out.println("Back in main thread");
    }

    public void run(){
        b.bar(a);
        System.out.println("Back in other thread");
    }

    public static void main(String args[]){
        new Deadlock();
    }
}