Problems in dealing with event handlers.... getSource()

Hi everybody,

I was trying to program a simple calculator. I assigned the buttons the addActionListener method through

piu.addActionListener(this);

per.addActionListener(this);

div.addActionListener(this);

meno.addActionListener(this);

radice.addActionListener(this);

quadrato.addActionListener(this);

but it seems that when I press these buttons the program doesn't call tha actionPerformed event and so it doesn't execute the code in it. What is the mistake?

this is my code:

package array;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.net.MalformedURLException;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

/**

*

* @author Val

*/

publicclass ProvaGuiextends JFrameimplements ActionListener{

private JLabel result, lab1, lab2;

privatestatic JFrame frame;

private JPanel pan, pan2;

private JButton per, div, piu, meno, radice, quadrato, uguale, clear;

private JTextField campo1, campo2, ris;

public ProvaGui(String par)throws MalformedURLException{

super(par);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container cont = getContentPane();

pan =new JPanel();

this.pack();

Toolkit tk = Toolkit.getDefaultToolkit();

Dimension d= tk.getScreenSize();

setSize((int)d.getWidth()/2,(int)d.getHeight()/6);

setLocation((int)d.getWidth()/4,(int)d.getHeight()/4);

setResizable(false);

JButton clear =new JButton("C");

clear.addActionListener(this);

pan.add(clear);

cont.add(pan);

JButton per =new JButton("*");

JButton div =new JButton(":");

JButton piu =new JButton("+");

JButton meno =new JButton("-");

JButton radice =new JButton("x^(1/2)");

JButton quadrato =new JButton("x^2");

JButton uguale =new JButton("=");

pan.add(per);

pan.add(div);

pan.add(piu);

pan.add(meno);

pan.add(radice);

pan.add(quadrato);

pan.add(uguale);

JTextField campo1 =new JTextField("",8);

JTextField campo2 =new JTextField("",8);

JLabel lab1 =new JLabel("Operando 1");

JLabel lab2 =new JLabel("Operando 2");

JLabel result =new JLabel("Risultato: ");

JTextField ris =new JTextField("",8);

JPanel pan2 =new JPanel();

piu.addActionListener(this);

per.addActionListener(this);

div.addActionListener(this);

meno.addActionListener(this);

radice.addActionListener(this);

quadrato.addActionListener(this);

uguale.addActionListener(this);

pan2.add(lab1);

pan2.add(campo2);

pan2.add(lab2);

pan2.add(campo1);

cont.add(pan2,"South");

JPanel pan3 =new JPanel();

pan3.add(result);

pan3.add(ris);

cont.add(pan3,"East");

}

publicvoid actionPerformed(ActionEvent evt){

if(evt.getSource().equals(clear)){

campo1.setText("ggg");

campo2.setText("ggg");

System.out.println("AQUI!");

}else{if(evt.getSource().equals(uguale)){

ris.setText("");

}

}

}

publicstaticvoid main (String[] args)throws MalformedURLException{

ProvaGui frame =new ProvaGui("Calcolatrice");

frame.setVisible(true);

}

}

Thank u for any help!

[6946 byte] By [swift1980a] at [2007-11-26 12:24:34]