Java Swing Moving Undecorated jFrame

Swing_java_undecorated_draggable.txt

// create global variable
int xx=0;
int yy=0;

// add mouse presesd event listner on the component you want to make dragger
    private void jPanel1MousePressed(java.awt.event.MouseEvent evt) {                                     
       xx=evt.getX();
       yy=evt.getY();  
    }               
    
// add mouse Dragged event listner on the component you want to make dragger
    private void jPanel1MouseDragged(java.awt.event.MouseEvent evt) {                                     
       int x=evt.getXOnScreen();
       int y=evt.getYOnScreen();
       this.setLocation(x-xx, y-yy);
    }