JLabel doesn't show up

Question

I'm working on a program but my JLabel doesn't show up. My JButton works perfectly (it appears) but for some reason the JLabel does not appear. I have checked on internet but I Haven't found anything.

package com.hinx.client;

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

public class Main {

    public static void main(String [] args) 
    {
        createWindow();
    }       

    static void createWindow()
    {           

        //Create panel
        JPanel content = new JPanel();
        content.setLayout(null);

        //Build the frame
        JFrame frame = new JFrame("Hinx - A marketplace for apps - Client ALPHA_0.0.1");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(700, 400);
        frame.setResizable(false);
        frame.setLocationRelativeTo(null);
        frame.add(content);
        frame.setVisible(true);

        //Add the login button
        JButton login = new JButton("Login");
        login.setBounds(0, 342, 150, 30);

        //Create login label
        JLabel loginlabel = new JLabel("Login Area");

        //Create login panel
        JPanel loginpanel = new JPanel();
        loginpanel.setLayout(null);
        loginpanel.setBounds(0, 0, 150, 400);
        loginpanel.setBackground(Color.gray);
        loginpanel.add(login);
        loginpanel.add(loginlabel);         

        content.add(loginpanel);
    }       
}

score 6 · Answer 1 · answered May 03 '13 at 13:49

6

I have checked on internet but I Haven't found anything.

JFrame is visible before JComponents (frame.add(content);) are added / created
move code line frame.setVisible(true); (better everything about JFrame) to the end of constuctor

answered May 03 '13 at 13:49

mKorbel

109,525
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score 5 · Accepted Answer · answered May 03 '13 at 13:47

5

Set a layout for your panel. Per example :

loginpanel.setLayout(new BorderLayout());

You can learn more about layouts here.

Here's what I get : enter image description here

answered May 03 '13 at 13:47

Alexis C.

91,686
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I cant change the location of the JLabel even by using setBounds(); – James L. May 03 '13 at 13:53
2

*"I cant change the location of the JLabel even by using setBounds()"* Don't use `setBounds()`! – Andrew Thompson May 03 '13 at 13:53
Well I used setLocation() and it did not work. I really need to place the JLabel at a specific location. – James L. May 03 '13 at 13:55
@AndrewThompson People just don't want to accept fact that you have to use layout managers. This is not .NET! – Branislav Lazic May 03 '13 at 13:56
*"I really need to place the JLabel at a specific location."* If you really knew the size components need to be and how to place them, you could include that logic in a custom layout manager. But trust me, you don't. You really just need to understand how to work with layout managers (+ layout padding, borders etc.) & how to nest them inside one another. If the problem is the layout, your next question should focus on that. Provide ASCII art of how the GUI should look. – Andrew Thompson May 03 '13 at 14:07
I figured out how to place it to a specific location, but thanks for the help! – James L. May 03 '13 at 14:21

score 2 · Answer 3 · answered May 03 '13 at 13:49

2

Use layouts. FlowLayout should be fine in this case. Do not call setBounds() and do not set layout as a null.
Add label and button on JPanel
Then add JPanel on JFrame
Call pack() instead of setSize()
Call setVisible(true) in the end.

Good luck!

answered May 03 '13 at 13:49

Branislav Lazic

14,388
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score 2 · Answer 4 · edited May 23 '17 at 10:25

You are making setLayout null.

    JPanel loginpanel = new JPanel();
    loginpanel.setLayout(null);

Use this,

    JPanel loginpanel = new JPanel();
    loginpanel.setLayout(new BorderLayout());

Run the UI on the EDT instead of running on the main thread. Read this post.

Example:

public static void main(String [] args) 
    {
        Runnable r  = new Runnable() {

            @Override
            public void run() {
                createWindow();
            }
        };

        EventQueue.invokeLater(r);
    }

JLabel doesn't show up

4 Answers4

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