[Center a JFrame] centers a jframe onscreen. #java #swing #jframe

CenteredJFrame.java

public class CenteredJFrame {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    center(frame, 800, 600);
    frame.add(new JButton("Bananas"));
    frame.add(new JButton("Oranges"));
    frame.add(new JButton("Apples"));
    
    frame.setVisible(true);
  }
  
  /**
    * Sets the width and height of a {@link JFrame} and centers it on the screen
    * the screen.
    */
   public static void center(JFrame frame, int width, int height) {
      Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
      final int _x = (screen.width / 2) - (width / 2);
      final int _y = (screen.height / 2) - (height / 2);

      final Rectangle rect = new Rectangle(_x, _y, width, height);
      frame.setBounds(rect);

      final Dimension dims = new Dimension(width, height);
      frame.setMinimumSize(dims);
   }
}