Computer Science Canada

Button Help
Author:  Krocker [ Mon Dec 19, 2011 5:58 pm ]
Post subject:  Button Help
Hey guys, im trying to make a computer cleaning software that deletes specific files specified within the program. I made a basic interface with only 2 buttons for now, but i need help positioning it and making the buttons do something when clicked. im really new to this so please be specific:


code:

import java.awt.*;
import java.awt.event.*;

public class ButtonText
{
    public static void main (String[] args)
    {


        Frame frame = new Frame ("KCleaner");
        Button button1 = new Button ("Clean");
        frame.add (button1);
        Button button2 = new Button ("About");
        frame.add (button2);
        frame.setLayout (new FlowLayout ());
        frame.setSize (300, 100);
        frame.setVisible (true);
        frame.addWindowListener (new WindowAdapter ()
        {
            public void windowClosing (WindowEvent e)
            {
                System.exit (0);
            }
        }
        );
    }
}
Author:  randint [ Fri Dec 30, 2011 10:18 pm ]
Post subject:  Re: Button Help
Well, you can use the setBounds(int x, int y, int width, int height) to position your buttons within the JFrame, as for how to make the buttons do something, you need:
a constructor (some method that has the same name, same case that the class does) and some ActionListener objects, for example:
Java:

import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame implements ActionListener
{
   public JFrame f1 = new JFrame ("Frame");
   public JPanel p1 = new JPanel ();
   public JButton b1 = new JButton ("Button 1");
   public JButton b2 = new JButton ("Button 2");
   public Test ()
   {
      b1.addActionListener(this);
      b2.addActionListener(this);
      f1.setContentPane(p1);
      f1.setSize(400, 400);
      p1.add (b1);
      p1.add(b2);
      f1.setVisible (true);
   }
   public void actionPerformed (ActionEvent e)
   {
      if (e.getSource () == b1)
      {
         JOptionPane.showMessageDialog (null, "Button 1 is clicked!");
      }
      else if (e.getSource () == b2)
      {
         JOptionPane.showMessageDialog(null, "Button 2 is clicked");
      }
   }
   public static void main (String args[])
   {
      new Test ();
   }
}

So, there needs to be a void method named "actionPerformed" with parameter ActionPerformed e (it has to be that way, otherwise there WILL be a SYNTAX ERROR), then use the getSource() method to respond to mouse events (clicks) that are "listened" by ActionListener.
Author:  Velocity [ Wed Jan 11, 2012 11:33 am ]
Post subject:  Re: Button Help
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame implements ActionListener
{
public JFrame f1 = new JFrame ("Frame");
public JPanel p1 = new JPanel ();
public JButton b1 = new JButton ("Button 1");
public JButton b2 = new JButton ("Button 2");
public Test ()
{
b1.addActionListener(this);
b2.addActionListener(this);
f1.setContentPane(p1);
f1.setSize(400, 400);
p1.add (b1);
p1.add(b2);
f1.setVisible (true);
}
public void actionPerformed (ActionEvent e)
{
if (e.getSource () == b1)
{
JOptionPane.showMessageDialog (null, "button one was pressed");
}
if (e.getSource () == b2)
}
JOptionPane.showMessageDialog (null, "button two was pressed");
{
return (value) 0 + (newValue);
System.out ("pause")
}

is a true statement ^^^^

:


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