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
