Thread: Java Swing Application

I made a simple java application for fun which I was planning to add on to and make alot better. I ran into an error with an action listener problem. The main point of the program was for me to click the button and it would show a label. I tried and tried but it never worked. So I decided to test whenever I clicked the button if it could output to the console window instead of displaying something on the gui. Of course it worked and now Im really puzzled on how and why one part is working and one is not.

Heres my code:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
 
public class Frame extends JFrame{
 
 
	static JLabel label;
	static JButton button;
	static JFrame frame;
 
	public static void main(String[] args){
		frame = new JFrame("Hello World!");
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(500, 400);
		frame.setLayout(new FlowLayout());
 
		button = new JButton("Click Me!");
		frame.add(button);
 
		label = new JLabel("THIS BETTER WORK!");
 
		button.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e) {
				frame.add(label);
				System.out.println("BUTTON IS PRESSED!");
			}
		});
 
 
 
 
	}
 
}

I made a simple java application for fun which I was planning to add on to and make alot better. I ran into an error with an action listener problem. The main point of the program was for me to click the button and it would show a label. I tried and tried but it never worked. So I decided to test whenever I clicked the button if it could output to the console window instead of displaying something on the gui. Of course it worked and now Im really puzzled on how and why one part is working and one is not.

Heres my code:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
 
public class Frame extends JFrame{
 
 
	static JLabel label;
	static JButton button;
	static JFrame frame;
 
	public static void main(String[] args){
		frame = new JFrame("Hello World!");
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(500, 400);
		frame.setLayout(new FlowLayout());
 
		button = new JButton("Click Me!");
		frame.add(button);
 
		label = new JLabel("THIS BETTER WORK!");
 
		button.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e) {
				frame.add(label);
				System.out.println("BUTTON IS PRESSED!");
			}
		});
 
 
 
 
	}
 
}

Ok what should my class be extending then? And then I would need to put flowlayout in the actionPerformed method?

Ok so I looked at the class, I see alot of methods but im not sure exactly what I should be looking for? Could u give an example of what the code should look like to work?

Ok so the weirdest thing happened. I went ahead and did what you said and found a method that should work:

frame.add(label, new FlowLayout());

but it didnt so I went back to this:

frame.add(label);

As I was fiddling around with the screen I saw that once I clicked the button and edited the frames dimensions by dragging the screen smaller or bigger, the text showed! Im not sure how or why its doing this though. If I don't click the button and change the screens size it doesn't do anything. Its only if I click the button and drag the screen smaller or bigger that It will show the text! Im not sure the problem now, but I hope you can help. Thanks!

Well how do most people do it then? I suspect that theres people that when a button is clicked something from the layout is changed right? Theres got to be a way.

This is really weird I have a text field that I made and whenever I start the program it doesnt show until I drag the screen bigger or smaller, Its not even being changed inside a listener. I'm just gonna show you the whole code. Right now im just trying everything and experimenting because this is really weird, Im not sure why its happening.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
 
public class Fun{
 
	static JLabel label;
	static JButton button;
	static JFrame frame;
	static JPanel panel;
	static JTextField textField;
 
	public static void main(String[] args){
		frame = new JFrame("Hello World!");
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(500, 400);
		frame.setResizable(true);
		frame.setLayout(new FlowLayout());
		frame.setLocationRelativeTo(null);
		frame.getContentPane().setBackground(Color.CYAN);
 
		textField = new JTextField("Type Here");
		frame.add(textField);
 
		/*button.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e) {
				frame.add(label);
				System.out.println("BUTTON IS PRESSED!");
			}
		});
		*/
	}
 
}

Ok so norm im kind of not sure what your trying to get at here. Im sure your correct in how your thinking it but in my mind im not understanding what your trying to say. In my mind how can the frame display something before something is added to the frame? If you could possibly re-word what you were saying. Thanks.

Ok yeah I get it now, and It worked. Thanks alot!

--- Update ---

Great news! I figured out how to edit a layout in a listener. What I did was called the repaint function in the listener then made it visible to reset the components. I just went ahead and made it so when I clicked a button it deleted the text field. So heres the code and I underlined and bolded the main parts that show what I added and how it helped.

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


public class Fun{

static JLabel label;
static JButton button;
static JFrame frame;
static JPanel panel;
static JTextField textField;

public static void main(String[] args){

frame = new JFrame("Hello World!");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
frame.setSize(500, 400);
frame.setResizable(true);
frame.setLayout(new FlowLayout());
frame.setLocationRelativeTo(null);
frame.getContentPane().setBackground(Color.CYAN);

textField = new JTextField("Type Here");
frame.add(textField);
button = new JButton("ClickME!");
frame.add(button);
frame.setVisible(true);

button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {

frame.remove(textField);
System.out.println("BUTTON IS PRESSED!");
frame.repaint();
frame.setVisible(true);
}
});

}

}
__________________________________________________ ____________________________________________
So in other words instead of using one method you said was located in the containers class I just repainted and setVisible to true and It worked perfectly! Thanks for walking me through It! You earned a Thanks!