How to display a JFrame to the center of a screen in Java?


A JFrame is a subclass of Frame class and the components added to a frame are referred to as its contents, these are managed by the contentPane. We can add the components to a JFrame to use its contentPane instead. A JFrame is like a Window with border, title, and buttons. We can implement most of the java swing applications using JFrame.

By default, a JFrame can be displayed at the top-left position of a screen. We can display the center position of JFrame using the setLocationRelativeTo() method of Window class.

Syntax

public void setLocationRelativeTo(Component c)

Example

import javax.swing.*;
import java.awt.*;

public class JFrameCenterPositionTest extends JFrame {
   public JFrameCenterPositionTest() {
      setTitle("JFrameCenter Position");
      add(new JLabel("JFrame set to center of the screen", SwingConstants.CENTER), BorderLayout.CENTER);
      setSize(400, 300);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setLocationRelativeTo(null); // this method display the JFrame to center position of a screen
      setVisible(true);
   }
   public static void main (String[] args) {
      new JFrameCenterPositionTest();
   }
}

Output


raja
Published on 11-Sep-2019 17:11:40
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