Java Swing window centered on screen

Desktop application development using Java SWING or AWT, the main window may be provided with a position generally centrally of the main window, use the following method: 

01, a first method       int windowWidth = frame.getWidth (); // get the window width       int windowHeight = frame.getHeight (); // get a high window       Toolkit kit = Toolkit.getDefaultToolkit (); // define Kit       Dimension screenSize = kit.getScreenSize (); // Get size of the screen       int screenWidth = screenSize.width; // Get the screen width       int screenHeight = screenSize.height; // Get screen high       frame.setLocation (screenWidth / 2-windowWidth / 2 , screenHeight / 2-windowHeight / 2 ); // set centered window  02, the second method       Toolkit kit = Toolkit.getDefaultToolkit (); // define Kit       Dimension screenSize = kit.getScreenSize (); // Get the screen size 
        







   





     int screenWidth = screenSize.width / 2; // Get the screen width 
     int screenHeight = screenSize.height / 2; // Get high screen 
     int height = this.getHeight (); 
     int width = this.getWidth (); 
     the setLocation ( screenWidth-width / 2, screenHeight-  height / 2);

 

03, the third method, a method is provided after jdk1.4       

　　setLocationRelativeTo (owner); //   this is a set window relative to the position of another window (typically centered in the middle of the parent window), if the owner == null resident on the center of the screen window. 

　　

　　 So the quickest way is to set up:   jf.setLocationRelativeTo (null); // make the form center

 

 

04, the fourth method,

 

When a large plurality of display screens can be used together consisting of a simultaneous display window, can achieve the centering, the centering window to previous methods, a screen is limited to the current window center. 

private void setFrameCenterToScreenCenter_2(){

Point pointSreenCenter = GraphicsEnvironment.getLocalGraphicsEnvironment().getCenterPoint(); 
setLocation(pointSreenCenter.x-getSize().width/2, pointSreenCenter.y-getSize().height/2); 
}