Java - Resize Undecorated Window

Here is a handy class for resizing undecorated window (JFrame).

/** *********************************************************************************************
* RESIZE UNDECORATED WINDOW CLASS
*
* @author Stanislav Zorjan
* @copyright (c)Copyright 2007 - Stanislav Zorjan newcomponents@neobee.net
*
* As the name of the class says, this class resizes undecorated or decorated window (JFrame)
* Create new instance of the class and than call "onPress" method with "mousePressed" event
* and then "resizeWindowWidth" or "resizeWindowHeight" with "mouseDragged" event.
*/
/***********************************************************************************************/
package resizewindow;

public class ResizeUndecoratedWindow {
	
	private int x1;
	private int x2;
	private int y1;
	private int y2;
	
	private int positionx;
	private int positiony;
	
	private JFrame frame;
	
	ResizeUndecoratedWindow(JFrame frame){
		this.frame = frame;
	}
	
	
	public void resizeWindowWidth(java.awt.event.MouseEvent evt){
		
		this.positionx = evt.getXOnScreen();
	
            if(this.positionx > this.x1){
                this.x2 = this.positionx - this.x1;
                this.frame.setSize(this.frame.getSize().width + this.x2, this.frame.getSize().height);
            }else if(this.positionx < this.x1){
                this.x2 =  this.x1- this.positionx;
                this.frame.setSize(this.frame.getSize().width - this.x2, this.frame.getSize().height);
            }
            
            this.x1 = this.positionx;
	}
	
	
	public void resizeWindowHeight(java.awt.event.MouseEvent evt){
		
		this.positiony = evt.getYOnScreen();
	
            if(this.positiony > this.y1){
                this.y2 = this.positiony - this.y1;
                this.frame.setSize(this.frame.getSize().width, this.frame.getSize().height + this.y2);
            }else if(this.positiony < this.y1){
                this.y2 =  this.y1 - this.positiony;
                this.frame.setSize(this.frame.getSize().width, this.frame.getSize().height - this.y2);
            }
            
            this.y1 = this.positiony;
	}
	
	
	public void onPress(java.awt.event.MouseEvent evt){
		this.x1 = evt.getXOnScreen();
		this.y1 = evt.getYOnScreen();
	}
}