class BasicThread extends Thread{

    char c;
    
    BasicThread(char c) {
        this.c = c;
    }    

    // override run() method in inherited by Thread via
    // the Runnable interface
    public void run() {
        for(int i=0; i<100; i++) {
            System.out.print(c);
            
            try{ 
                sleep((int)(Math.random() * 10));
            } catch( InterruptedException e ) {
                System.out.println("Interrupted Exception caught");
            }
        }
    }    

    public static void main(String[] args) {
    
        BasicThread bt = new BasicThread('!');
        BasicThread bt1 = new BasicThread('*');                

        bt.start();    
        bt1.start();
    }

}