How can I remove JButton from JFrame?

Question

I want to remove JButton when user click JButton.

I know that I should use remove method, but it did not work.

How can I do this?

Here is my code:

class Game implements ActionListener {

JFrame gameFrame;
JButton tmpButton;
JLabel tmpLabel1, tmpLabel2, tmpLabel3, tmpLabel4;

public void actionPerformed(ActionEvent e) {
    gameFrame.remove(tmpLabel1);
    gameFrame.getContentPane().validate();
    return;
}

Game(String title) {
    gameFrame = new JFrame(title);
    gameFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gameFrame.setBounds(100, 100, 300, 500);
    gameFrame.setResizable(false);
    gameFrame.getContentPane().setLayout(null);

    tmpLabel4 = new JLabel(new ImageIcon("./images/bomber.jpg"));
    tmpLabel4.setSize(200, 200);
    tmpLabel4.setLocation(50, 100);
    tmpButton = new JButton("Play");
    tmpButton.setSize(100, 50);
    tmpButton.setLocation(100, 350);
    tmpButton.addActionListener(this);

    gameFrame.getContentPane().add(tmpLabel4);
    gameFrame.getContentPane().add(tmpButton);
    gameFrame.setVisible(true);
}
}

You need to first call `revalidate()/repaint()` on the already visible container, when the `JButton` is removed. Moreover, stop using Absolute Positioning, instead use a genuine Layout Manager. — nIcE cOw, Dec 21 '14 at 05:47
@GáborBakos Are you aware that `JFrame#remove` can delegate to the call to the `contentPane`, just like `JFrame#add`? Not saying it's always a good idea ;) — MadProgrammer, Dec 21 '14 at 05:49
Java GUIs have to work on different OS', screen size, screen resolution etc. As such, they are not conducive to pixel perfect layout. Instead use layout managers, or [combinations of them](http://stackoverflow.com/a/5630271/418556) along with layout padding and borders for [white space](http://stackoverflow.com/a/17874718/418556). — Andrew Thompson, Dec 21 '14 at 06:14
*"I know that I should use remove method.."* It would probably be **better** to use a [`CardLayout`](http://download.oracle.com/javase/8/docs/api/java/awt/CardLayout.html) as shown in [this answer](http://stackoverflow.com/a/5786005/418556). — Andrew Thompson, Dec 21 '14 at 06:21
Quote from Java Doc: " Lightweight and heavyweight components may be mixed in a single component hierarchy. However, for correct operating of such a mixed hierarchy of components, the whole hierarchy must be valid. When the hierarchy gets invalidated, like after changing the bounds of components, or adding/removing components to/from containers, the whole hierarchy must be validated afterwards by means of the Container.validate() method invoked on the top-most invalid container of the hierarchy. " http://docs.oracle.com/javase/7/docs/api/javax/swing/JButton.html — Lalith J., Dec 21 '14 at 06:57

score 6 · Answer 1 · answered Dec 21 '14 at 06:33

6

If hiding the button instead of removing works for your code then you can use:

public void actionPerformed(ActionEvent event){
   tmpButton.setVisible(false);
 }

for the button.But the button is just hidden not removed.

answered Dec 21 '14 at 06:33

hermit

1,048
1
6
16

score 3 · Answer 2 · answered Dec 21 '14 at 05:47

The simplest solution might be to...

Attach an ActionListener to the button, see How to Use Buttons, Check Boxes, and Radio Buttons and How to Write an Action Listeners for more details
When the ActionListener is clicked, extract the source of the event, JButton buttonThatWasClicked = (JButton)actionEvent.getSource()
Remove it from it's parent...

For example...

Container parent = buttonThatWasClicked.getParent();
parent.remove(buttonThatWasClicked);
parent.revaidate();
parent.repaint();

As some ideas...

score 1 · Answer 3 · answered Dec 21 '14 at 05:57

First of all in your actionPerformed method you need to check that the button is clicked or not. And if the button is clicked, remove it. Here's how :

if(e.getSource() == tmpButton){
   gameFrame.getContentPane().remove(tmpButton);
}

add this to your actionPerformed Method

score 0 · Answer 4 · answered Dec 21 '14 at 10:07

don't add your button to jframe but add each component you want!

public void actionPerformed(ActionEvent event)
{
   //gameFrame.getContentPane().add(tmpButton); -=> "Commented Area"
   gameFrame.getContentPane().validate();
}

or hide your button like this

public void actionPerformed(ActionEvent event)
{
   tmpButton.setVisible(false);
}

How can I remove JButton from JFrame?

4 Answers4