2 Threads

public class RunThread extends Thread{


    public RunThread(){

    }

    @Override
    public void run() {
        for(int i = 1;i<=20;i++){
            System.out.print(i + " * ");
            try {
                Thread.sleep(500);
            }
            catch(InterruptedException e){
                e.printStackTrace();
            }
        }

        for(int k = -20;k<=-1;k++){
            System.out.println("<>"+k);
            try {
                Thread.sleep(500);
            }
            catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args){
        new RunThread().start();
    }
}