Needed help in actionPerformed statements

Question:

http://img819.imageshack.us/img819/2123/javaz.jpg

Here's the code that I have done:

Code:

---

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

public class GUI extends JFrame implements ActionListener
{
        JButton btn1;
        JButton btn2;
        JButton btn3;
        JTextArea area1;

        GUI()
        {
                setLayout (new BorderLayout());

                btn1 = new JButton ("Elephant");
                btn2 = new JButton ("Mickey");
                btn3 = new JButton ("Butterfly");
                area1 = new JTextArea ("");

                JPanel p1 = new JPanel();
                JPanel p2 = new JPanel();


                p1.add (btn1);
                p1.add (btn2);
                p1.add (btn3);
                p2.add (area1);

                add(p2, BorderLayout. CENTER);
                add(p1, BorderLayout. SOUTH);
        }

                public static void main (String []args)
                {
                        String [] photos = {"elephant.jpg", "mickey.jpg", "butterly.jpg"};

                        GUI t = new GUI();

                        t.setSize(500,150);
                        t.setVisible(true);
                        t.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
                        t.setTitle("Button and Icons");
                }
                public void actionPerformed(ActionEvent evt)
                {
                        if(evt.getSource() == btn1)
                        {
                                area1.append();
                        }
                }

}

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Can anyone help me to tell me what should I write at the 'public void actionPerformed(ActionEvent evt)'?? Thanks (=

The easiest way to swap images is to create ImageIcons with your images and display them in a JLabel. You can swap the JLabel's displayed ImageIcon by calling setIcon on the JLabel. And in fact on looking at your instructions, it appears that the instructor wants you to do just this, create an array of ImageIcons and swap the icons using this array.

here's an example on how to load an image icon.

Code:

---

import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
public class IconDemo extends JFrame{
    private JLabel label;
    public IconDemo(){
        label = new JLabel();
        Icon icon = new ImageIcon( getClass().getResource("myimage.gif") );
        label.setIcon(icon);
        add(label);
    }
    public static void main(String[] args){
        IconDemo icondemo = new IconDemo();
        icondemo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        icondemo.setSize(260,180);
        icondemo.setVisible(true);
    }
}

---

try to understand and make use of it in your actionPerformed()

Quote:

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Originally Posted by JavaHater

here's an example on how to load an image icon.

Code:

---

import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
public class IconDemo extends JFrame{
    private JLabel label;
    public IconDemo(){
        label = new JLabel();
        Icon icon = new ImageIcon( getClass().getResource("myimage.gif") );
        label.setIcon(icon);
        add(label);
    }
    public static void main(String[] args){
        IconDemo icondemo = new IconDemo();
        icondemo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        icondemo.setSize(260,180);
        icondemo.setVisible(true);
    }
}

---

try to understand and make use of it in your actionPerformed()

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How do I display this label when the specific button's clicked? I still needed to use this public void actionPerformed(ActionEvent evt) for any event to occured right?

Suggested reading: How to Write an ActionListener, in particular the description of how to add action listeners to components such as JButtons

Quote:

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Originally Posted by S-NESH

How do I display this label when the specific button's clicked? I still needed to use this public void actionPerformed(ActionEvent evt) for any event to occured right?

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Code:

---

      .........
      add(p2, BorderLayout. CENTER);
        add(p1, BorderLayout. SOUTH);
   
        ButtonHandler handler = new ButtonHandler(); //create for button handling
        button.addActionListener ( handler ); //add the listener
      ....
    }
    //create inner class for button event handling
    private class ButtonHandler implements ActionListener {
        public void actionPerformed ( ActionEvent e ){
                        if(evt.getSource() == btn1)
                        {
                                            // load your image here
                        } else if ( ) {

                        }
        }
    }

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Cross posted: Java Programming Forums

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