Create an application with a square window Using Swing Part 1

Create an application with a square window in the center of the screen that is half the height of the screen by deriving your own window class from JFrame.

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import javax.swing.JFrame; import javax.swing.SwingUtilities; import java.awt.Toolkit; import java.awt.Dimension;   @SuppressWarnings("serial") public class SquareWindow extends JFrame {   public SquareWindow(String title) {     super(title);       Toolkit theKit = this.getToolkit();     Dimension wndSize = theKit.getScreenSize();       // Calculate window side length as half the screen height     int size = wndSize.height/2;       setBounds((wndSize.width - size)/2, (wndSize.height-size)/2,               // Position                            size, size);                                        // Size       setDefaultCloseOperation(EXIT_ON_CLOSE);     setVisible(true);   }      public static void main(String[] args) {     SwingUtilities.invokeLater(new Runnable() {             public void run() {               SquareWindow myWindow = new SquareWindow("http://java-programs-examples.blogspot.com/");             }         });    } }

Output of Above Java Program