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Thread: help with JButton closing a JFrame :)

  1. #1
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    Default help with JButton closing a JFrame :)

    hey,
    I made a JButton on my frame, but i need that button to set the frame its on to Visible(false), how do i do that, because i have tried it doesnt recognize the frame i have made.

    import java.awt.Color;
    import java.awt.Frame;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    import javax.swing.*;
     
    public class minecraft {
    		public void cookbook(){
    			JFrame frame = new JFrame("CookBook Menu");
    			JButton butenter = new JButton("ENTER");
    			frame.setVisible(true);
    			frame.setSize(500, 600);
    			frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
    			frame.setResizable(false);
    			frame.setLocationRelativeTo(null);
     
    			JPanel buttonPanel = new JPanel();
    	        buttonPanel.setLayout(null);
    	        buttonPanel.setLocation(195, 400);
    	        buttonPanel.setSize(100, 40);
    	        frame.add(buttonPanel);
    	        buttonPanel.add(butenter);
    	        butenter.setLocation(195, 400);
    	        butenter.setSize(100, 40);
     
    	        butenter.addActionListener(null);
     
     
    		new ActionListener(){
    		public void actionPerformed(ActionEvent e) {
    			frame.setVisible(false); // <---- that doesnt work, it doesnt recognize the frame!
     
    		}
     
    		};}
    		}

    its a minecraft java cookbook

    thanks,
    - Scott


  2. #2
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    Default Re: help with JButton closing a JFrame :)

    it doesnt recognize the frame
    Can you explain? If there are error messages, please copy and paste the full text.

    Is the frame variable in scope where you are trying to reference it?
    Move its definition so it is visible where you referring to it.

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    Default Re: help with JButton closing a JFrame :)

    Quote Originally Posted by Norm View Post
    Can you explain? If there are error messages, please copy and paste the full text.

    Is the frame variable in scope where you are trying to reference it?
    Move its definition so it is visible where you referring to it.

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    Default Re: help with JButton closing a JFrame :)

    i need the button i made to close (or to make it visible(false)) when i click it.

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    Default Re: help with JButton closing a JFrame :)

    If there are error messages, please copy and paste the full text.

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    Default Re: help with JButton closing a JFrame :)

    Cannot refer to a non-final variable frame inside an inner class defined in a different method

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    Default Re: help with JButton closing a JFrame :)

    Have you tried making frame final?
    final JFrame frame = ...

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    Default Re: help with JButton closing a JFrame :)

    yes, that removes the error but doesnt set the frame to visible(false) when i press the button
    Last edited by skerridge; December 21st, 2011 at 08:53 AM.

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    Default Re: help with JButton closing a JFrame :)

    How is the method with the call to the setVisible method called? Where in your code do you call it?
    You have to cause the method to be called by writing some code.

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    Default Re: help with JButton closing a JFrame :)

    sorry, im a kind of newbie at java, can you give me an example? or edit some of my code? that would be much appreciated.

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    Default Re: help with JButton closing a JFrame :)

    Where did you get the code from?
    Why do you expect the actionPerformed method to be called?
    Have you read about how to use ActionListeners?
    Go to this site and read up:
    How to Write an Action Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)

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    Default Re: help with JButton closing a JFrame :)

    I'm not sure but I think "frame.dispose();" would work.

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    Default Re: help with JButton closing a JFrame :)

    Try to use
    System.exit(0)
    or
    frame.dispose()
    These should work better to close a JFrame

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    Default Re: help with JButton closing a JFrame :)

    System.exit(0) does a lot more than just closing a frame.

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    Default Re: help with JButton closing a JFrame :)

    Inspite of this frame.setVisible(false);

    Try this one
    frame.dispose(this);
    Last edited by RaoPatek; January 15th, 2012 at 03:45 AM.

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    Default Re: help with JButton closing a JFrame :)

    public void dispose()

    Releases all of the native screen resources used by this Window, its subcomponents, and all of its owned children. That is, the resources for these Components will be destroyed, any memory they consume will be returned to the OS, and they will be marked as undisplayable.

    The Window and its subcomponents can be made displayable again by rebuilding the native resources with a subsequent call to pack or show. The states of the recreated Window and its subcomponents will be identical to the states of these objects at the point where the Window was disposed (not accounting for additional modifications between those actions).

    Note: When the last displayable window within the Java virtual machine (VM) is disposed of, the VM may terminate.
    public void setVisible(boolean b)

    Shows or hides this component depending on the value of parameter b.

    Parameters:
    b - if true, shows this component; otherwise, hides this component
    Also, dispose() is the method of java.awt.Window and setVisible() is of java.awt.Component classes.

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