Programming Forums > Application Development > Java

TeamElement1 · Oct 2nd, 2005, 9:09 PM

I have a class that implements actionlistener, and I add an actionlistener to a button button.addActionListener(this); it says "cannot use this in a static context"

??

OpenLoop · Oct 2nd, 2005, 10:17 PM

it means that you can only use this in an object of the class and not the class itself.

susam_pal · Oct 3rd, 2005, 2:26 AM

TeamElement1, can you please share the code?

I tried the following code:-

(Toggle Plain Text)

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

public class Test
{
	public static void main(String[] args)
	{
		MyFrame frame = new MyFrame();
		frame.show();

	}
}

class MyFrame extends JFrame implements ActionListener
{
	public MyFrame()
	{
		JButton button = new JButton("Ok");
		JPanel panel = new JPanel();
		panel.add(button);
		button.addActionListener(this);
		getContentPane().add(panel);
		pack();
	}

	public void actionPerformed(ActionEvent e)
	{
		System.out.println("button pressed!");
	}

}

its similar to what you say, this code has a button.addActionListener(this) statement. but it compiles and runs successfully!

TeamElement1 · Oct 8th, 2005, 1:47 PM

I fixed it, I guess static was where it shouldn't be. I was just being careless

Oct 2nd, 2005, 9:09 PM	#1
TeamElement1 Newbie Join Date: Oct 2005 Posts: 8 Rep Power: 0	noob gui help.. I have a class that implements actionlistener, and I add an actionlistener to a button button.addActionListener(this); it says "cannot use this in a static context" ??

Oct 3rd, 2005, 2:26 AM	#3
susam_pal Encoder Join Date: Sep 2005 Location: India Posts: 12 Rep Power: 0	TeamElement1, can you please share the code? I tried the following code:- (Toggle Plain Text) import javax.swing.; import java.awt.; import java.awt.event.; public class Test { public static void main(String[] args) { MyFrame frame = new MyFrame(); frame.show(); } } class MyFrame extends JFrame implements ActionListener { public MyFrame() { JButton button = new JButton("Ok"); JPanel panel = new JPanel(); panel.add(button); button.addActionListener(this); getContentPane().add(panel); pack(); } public void actionPerformed(ActionEvent e) { System.out.println("button pressed!"); } } import javax.swing.; import java.awt.; import java.awt.event.; public class Test { public static void main(String[] args) { MyFrame frame = new MyFrame(); frame.show(); } } class MyFrame extends JFrame implements ActionListener { public MyFrame() { JButton button = new JButton("Ok"); JPanel panel = new JPanel(); panel.add(button); button.addActionListener(this); getContentPane().add(panel); pack(); } public void actionPerformed(ActionEvent e) { System.out.println("button pressed!"); } } its similar to what you say, this code has a button.addActionListener(this) statement. but it compiles and runs successfully!

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Oct 2nd, 2005, 10:17 PM	#2
OpenLoop Expert Programmer Join Date: May 2005 Location: East Lansing, MI Posts: 663 Rep Power: 4	it means that you can only use this in an object of the class and not the class itself.

Oct 8th, 2005, 1:47 PM	#4
TeamElement1 Newbie Join Date: Oct 2005 Posts: 8 Rep Power: 0	I fixed it, I guess static was where it shouldn't be. I was just being careless

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Programming Forums > Application Development > Java

noob gui help..