Vermischtes

package robottest;

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.InputEvent;

class athread extends Thread{    public athread(){
        this.start();
    }
    public void run() {
      //Move mouse and  submit a click
        try {
            Robot ro = new Robot();
            for (int i = 0; i < 2; i++) {
                try {
                    Thread.sleep(5000);
                }  catch (InterruptedException ex) {
                    ex.printStackTrace();
                }
                ro.mouseMove(255,155);
                ro.mousePress(InputEvent.BUTTON1_DOWN_MASK);
             
            }
        }  catch (AWTException ex) {
            ex.printStackTrace();
        }
    }
}

/* i always get:
Exception in thread "Thread-0" java.lang.IllegalArgumentException: Invalid combination of button flags
        at java.awt.Robot.checkButtonsArgument(Robot.java:190)
        at java.awt.Robot.mousePress(Robot.java:163)
        at robottest.athread.run(athread.java:20)

so what do i do wrong?
*/