print 1 to 10 sleep 1000

//main

package create3;

public class Create3 {

    public static void main(String[] args) {
       NumPrinter np1 = new NumPrinter();
       NumPrinter np2 = new NumPrinter();
       NumPrinter np3 = new NumPrinter();

       np1.start();
       try{np1.join();} catch(Exception ex){
               np2.start();
               np3.start();
               }
    }

}


//2nd class

package create3;

public class NumPrinter extends Thread{
    @Override
    public void run(){
    for(int i= 1;i<=10;i++){
    try{Thread.sleep(1000);} catch(Exception ex){};
    System.out.println(i);
    }
    }
    }