Thread: 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

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.

Originally Posted by Norm

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.

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

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

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

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

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.

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.

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)

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

Try to use

System.exit(0)

or

frame.dispose()

These should work better to close a JFrame

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

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.