Calling from java buttons in an applet

Question

ok i made this program here and now i'am tryin to call certain certain classes from each button. i can't figure out how to do that.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JDemoGridLayout extends JApplet
JLabel greeting = new JLabel("SAMPLE", JLabel.CENTER);
Font HeadlineFont = new Font("Helvetica",Font.BOLD, 24);
private JButton b1 = new JButton ("Button 1");
private JButton b2 = new JButton ("Button 2");
private JButton b3 = new JButton ("Button 3");
private JButton b4 = new JButton ("Button 4");
private GridLayout layout = new GridLayout(6,6,6,6);
JLabel personalGreeting = new JLabel("");
Container con = getContentPane();
public void init()
  greeting.setFont(HeadlineFont);
personalGreeting.setFont(HeadlineFont);
con.add(greeting);
con.setLayout(new FlowLayout());
setLayout(layout);
add(b1);
add(b2);
add(b3);
add(b4);
}Edited by: javastudent101 on Mar 4, 2009 7:12 AM

Answer 1

javastudent101 wrote:
ok i made this program here and now i'am tryin to call certain certain classes from each button. i can't figure out how to do that.You don't call classes from buttons. What you can do is add a java.awt.event.ActionListener to each button. This ActionListener's actionPerformed() method will get called whenever the button is clicked. An example:
MyActionListener listener = new MyActionListener();
JButton button = new JButton("Do My Taxes");
button.setActionCommand("DoTaxes");
button.addActionListener(listener);
JButton button2 = new JButton("Take a Shower");
button2.setActionCommand("TakeShower");
button2.addActionListener(listener);
private class MyActionListener implements ActionListener {
   public void actionPerformed(ActionEvent e) {
      String command = e.getActionCommand();
      if ("DoTaxes".equals(command)) {
         // Whatever processing is necessary to do taxes
      else if ("TakeShower".equals(command)) {
         // Whatever it takes to take a shower.
}See [How to use Buttons|http://java.sun.com/docs/books/tutorial/uiswing/components/button.html] for more information.
Alternatively, you could use an Action specific to each JButton. Once you understand ActionListeners, it's pretty easy to understand Actions.