Source Code : Center a JFrame

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Center a JFrame

    

import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JFrame;

public class Main extends JFrame {
  public static void main(String[] args) {
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

    Main mainForm = new Main();
    mainForm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    mainForm.setSize(250, 250);

    mainForm.setLocation((screenSize.width - mainForm.getWidth()) / 2,
        (screenSize.height - mainForm.getHeight()) / 2);

    mainForm.pack();
    mainForm.setVisible(true);
  }
}

   
    
    
    
  

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