javajlabel

How to make JLabel in java display in the centre of the monitor


I tired even the .setLocationRelativeTo(null) but i guess it only works with JFrame. i looked up everywhere but no information of google. I also tried scrolling through the methods but here are too many. Please help me. I also tried typing .set then scrolling to look at the methods.


Solution

  • If you want to center the application window frame, use setLocationRelativeTo. If you want to center a label within a JPanel, you can use a layout manager for the panel and center the label using horizontalAlignment.

    enter image description here

    package org.example;
    
    import java.awt.*;
    import javax.swing.*;
    
    public class CenterLabelApp implements Runnable {
        private JPanel mainPanel;
    
        protected CenterLabelApp() {
            this.mainPanel = new JPanel();
    
            setup();
        }
    
        private void setup() {
            // Panel
            this.mainPanel.setLayout(new BorderLayout());
            this.mainPanel.setPreferredSize(new Dimension(400, 300));
    
            // Label
            JLabel label = new JLabel("Hello, World!");
            label.setHorizontalAlignment(SwingConstants.CENTER); // Center the label horizontally
            this.mainPanel.add(label, BorderLayout.CENTER); // Center the label vertically
        }
    
        @Override
        public void run() {
            JFrame frame = new JFrame("Center Label App");
            frame.setContentPane(this.mainPanel);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.pack();
            frame.setLocationRelativeTo(null); // Center the window
            frame.setVisible(true);
        }
    
        public static void main(String[] args) {
            SwingUtilities.invokeLater(new CenterLabelApp());
        }
    }
    

    You could also use the second param of the JLabel constructor to set alignment:

    // Center the label horizontally
    JLabel label = new JLabel("Hello, World!", SwingConstants.CENTER);