How to disable javax swing JButton in java

Question

I have created a swings application and there is a  Start  button on the GUI  I want that whenever I clicked on that  Start  button  the start button should be disabled and the  Stop  button be enabled   For that I have written the following code in the  ActionPeformed       method of the  Start  button  startButton setEnabled false   stopButton setEnabled true     But the above code is not creating the desired affect on the GUI   Is the above code correct for what I want to do   It s not working with  repaint    too   Edit   The code is very long so I can t paste all the code  I can tell  though  more about the code   In the  ActionPeformed  method of  start  button  after calling the above two statements  I am executing a  SwingWorker  thread   Is this thread creating any problem

User · Accepted Answer

For that I have written the following code in the "ActionPeformed(...)" method of the "Start" button

You need that code to be in the actionPerformed(...) of the ActionListener registered with the Start button, not for the Start button itself.

You can add a simple ActionListener like this:

JButton startButton = new JButton("Start");
startButton.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent ae) {
        startButton.setEnabled(false);
        stopButton.setEnabled(true);
     }
   }
 );

note that your startButton above will need to be final in the above example if you want to create the anonymous listener in local scope.

User · Answer

This works   public class TestButton    public TestButton         JFrame f   new JFrame        f setSize new Dimension 200 200        JPanel p   new JPanel        p setLayout new FlowLayout          final JButton stop   new JButton  Stop        final JButton start   new JButton  Start        p add start       p add stop       f getContentPane   add p       stop setEnabled false       stop addActionListener new ActionListener             public void actionPerformed ActionEvent e                start setEnabled true               stop setEnabled false                           start addActionListener new ActionListener             public void actionPerformed ActionEvent e                start setEnabled false               stop setEnabled true                          f setVisible true              param args     public static void main String   args        new TestButton

User · Answer

The code is very long so I can t paste   all the code    There could be any number of reasons why your code doesn t work  Maybe you declared the button variables twice so you aren t actually changing enabling disabling the button like you think you are  Maybe you are blocking the EDT   You need to create a SSCCE to post on the forum   So its up to you to isolate the problem  Start with a simple frame thas two buttons and see if your code works  Once you get that working  then try starting a Thread that simply sleeps for 10 seconds to see if it still works   Learn how the basice work first before writing a 200 line program   Learn how to do some basic debugging  we are not mind readers  We can t guess what silly mistake you are doing based on your verbal description of the problem

[java] How to disable javax.swing.JButton in java?

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