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classlevellock.java

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class Display

{

public void wish(String name)

{

//1 lack line of code

synchronized (Display.class)//class level lock

{

for(int i=0;i<10;i++)

{

System.out.print("Good morning ");

try

{

Thread.sleep(1000);

}

catch(Exception e)

{

}

System.out.println(name);

}

}

//1 lack line of code

}

}

class MyThread extends Thread

{

Display d;

String name;

MyThread(Display d,String s)

{

this.d=d;

this.name=s;

}

public void run()

{

d.wish(name);

}

}

class classlevellock

{//GET regular o/p

//different thread operate on different object but class level lock is aquired so regular o/p

public static void main(String[] args) {

Display d1=new Display();

Display d2=new Display();

MyThread t1=new MyThread(d1, "dhoni");

MyThread t2 = new MyThread(d2, "Yuvraj");

t1.start();

t2.start();

}

//check o/p

}