Thread Synchronization

class DemoOne{

void display(int num){

System.out.println(""+num);
try
{
Thread.sleep(1000);
}
catch(InterruptedException e){
System.out.println("Interrupted");
}
System.out.println("Done");
}
}



class DemoTwo implements Runnable{

int number;
DemoOne objone;
Thread objTh;

public DemoTwo(DemoOne one_num,int num){

objone=one_num;
number=num;

objTh=new Thread(this);

objTh.start();
}

public void run(){

synchronized(objone){
objone.display(number);
}
}
}



class SynchBlock{

public static void main(String a[]){

DemoOne objone=new DemoOne();

int digit=10;

DemoTwo objSynch1=new DemoTwo(objone,digit++);
DemoTwo objSynch2=new DemoTwo(objone,digit++);
DemoTwo objSynch3=new DemoTwo(objone,digit++);

try
{//wait for Threads to end

objSynch1.objTh.join();
objSynch2.objTh.join();
objSynch3.objTh.join();
}
catch(InterruptedException ex){
System.out.println("Error : "+ex);
}
}
}