Cant get Action listener to work.

[DrunkinP]

Hi Guys!! im having some trouble with my college project. basically i want create a password and username facility. when im clicking on the login button, the action listener appended to the Button isnt listening or taking in the arguments fo rteh user name and password.

i have posted the code up here and hopefully some one can help me out. i recon the syntax is correct. i have checked my braced just to make sure your listener class is OUTSIDE init() but INSIDE my applet class. my listeners are also appened. plz help me thanx DrunkinP

/**
* Title: project
* Description:
* Copyright: Copyright (c) 2005
* Company: college practicals
* @author trish
* @version 1.0
*/

import javax.swing.JOptionPane;
import java.applet.Applet;
import java.awt.event.*;
import java.awt.*;

public class project extends Applet
{
Label label1;
Button buttonEnterDetails;
Button buttonUpdateDetails;
Button buttonContactAdmin;
Button buttonSearchForBook;
Button buttonLogin;
Button button1 = new Button();
TextArea textUserName;
TextArea textPassWord;

public void init()
{
setLayout(null);
setBackground(Color.white);
setSize(800, 800); //size of applet in web page

label1 = new Label("Welcome to Books & Buy", Label.CENTER);
label1.setFont(new Font("Serif", Font.BOLD, 20));
label1.setBounds(70,8,280,40);
label1.setBackground(Color.white);
label1.setForeground(Color.blue);
add(label1); // add label1 to web page

Label labelUserName = new Label("User Name");
labelUserName.setFont(new Font("Serif", Font.BOLD, 15));
labelUserName.setBounds(8,100,80,40);
labelUserName.setBackground(Color.white);
labelUserName.setForeground(Color.blue);
add(labelUserName); // add label1 to web page

TextField textUserName = new TextField();
textUserName.setBounds(100,100,80,30);
add(textUserName);

Label labelPassWord = new Label("Password");
labelPassWord.setFont(new Font("Serif", Font.BOLD, 15));
labelPassWord.setBounds(200,100,80,40);
labelPassWord.setBackground(Color.white);
labelPassWord.setForeground(Color.blue);
add(labelPassWord); // add label1 to web page


TextField textPassWord = new TextField();
textPassWord.setBounds(300,100,80,30);
textPassWord.setEchoChar('*');
add(textPassWord);

Button buttonLogin = new Button();
buttonLogin.setLabel("Login");
buttonLogin.setBounds(390,100,60,30);
buttonLogin.setBackground(Color.white);
buttonLogin.setForeground(Color.blue);
add(buttonLogin);

buttonEnterDetails = new Button();
buttonEnterDetails.setLabel("Enter Details");
buttonEnterDetails.setBounds(8,152,86,32);
buttonEnterDetails.setBackground(Color.white);
buttonEnterDetails.setForeground(Color.blue);

add(buttonEnterDetails);

buttonUpdateDetails = new Button();
buttonUpdateDetails.setLabel("Update Details");
buttonUpdateDetails.setBounds(104,152,86,32);
buttonUpdateDetails.setBackground(Color.white);
buttonUpdateDetails.setForeground(Color.blue);

add(buttonUpdateDetails);

buttonContactAdmin = new Button();
buttonContactAdmin.setLabel("ContactAdmin");
buttonContactAdmin.setBounds(200,152,86,32);
buttonContactAdmin.setBackground(Color.white);
buttonContactAdmin.setForeground(Color.blue);

add(buttonContactAdmin);

buttonSearchForBook = new Button();
buttonSearchForBook.setLabel("Search");
buttonSearchForBook.setBounds(300,152,86,32);
buttonSearchForBook.setBackground(Color.white);
buttonSearchForBook.setForeground(Color.blue);

add(buttonSearchForBook);

ButtonListener ourButtonListener = new ButtonListener();
buttonEnterDetails.addActionListener(ourButtonListener);
buttonUpdateDetails.addActionListener(ourButtonListener);
buttonContactAdmin.addActionListener(ourButtonListener);
buttonSearchForBook.addActionListener(ourButtonListener);
buttonLogin.addActionListener(ourButtonListener);

}

class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
Object press = event.getSource();
if(press == buttonLogin)

buttonLogin_ActionPerformed(event);

}
}

void buttonLogin_ActionPerformed(ActionEvent event)
{
if(textUserName.getText().equalsIgnoreCase("phillipa") &&
textPassWord.getText().equalsIgnoreCase("flynn"))
{
JOptionPane.showMessageDialog(null,"Welcome to Babes in the Books!!");

}

else if(!(textUserName.getText().equalsIgnoreCase("phillipa") &&
textPassWord.getText().equalsIgnoreCase("flynn")))
{
JOptionPane.showMessageDialog(null,"Invalid Username and/or Password");

}
}

}

[JGRobinson]

Hi DrunkinP

There a quite a few problems with this code - all to do with local and class variable scope.

If you define an item within a method for instance

public void aMethod()
{
       ButtonListener ourButtonListener = new ButtonListener();
}

As soon as aMethod is finished, the object ourButtonListener will go out of scope and disappear ready for garbage collection, the same is the case in this code for the TextFields.

The code below seems to work ok.

/**
 * Title: project
 * Description:
 * Copyright: Copyright (c) 2005
 * Company: college practicals
 * @author trish
 * @version 1.0
 */

import javax.swing.JOptionPane;
import java.applet.Applet;
import java.awt.event.*;
import java.awt.*;

public class project extends Applet
{
    Label label1;
    Button buttonEnterDetails;
    Button buttonUpdateDetails;
    Button buttonContactAdmin;
    Button buttonSearchForBook;
    Button buttonLogin;
    Button button1 = new Button();
    TextField textUserName;
    TextField textPassWord;
    ButtonListener ourButtonListener;
    
    public void init()
    {
        setLayout(null);
        setBackground(Color.white);
        setSize(800, 800); //size of applet in web page
        
        label1 = new Label("Welcome to Books & Buy", Label.CENTER);
        label1.setFont(new Font("Serif", Font.BOLD, 20));
        label1.setBounds(70,8,280,40);
        label1.setBackground(Color.white);
        label1.setForeground(Color.blue);
        add(label1); // add label1 to web page
        
        Label labelUserName = new Label("User Name");
        labelUserName.setFont(new Font("Serif", Font.BOLD, 15));
        labelUserName.setBounds(8,100,80,40);
        labelUserName.setBackground(Color.white);
        labelUserName.setForeground(Color.blue);
        add(labelUserName); // add label1 to web page
        
        textUserName = new TextField();
        textUserName.setBounds(100,100,80,30);
        add(textUserName);
        
        Label labelPassWord = new Label("Password");
        labelPassWord.setFont(new Font("Serif", Font.BOLD, 15));
        labelPassWord.setBounds(200,100,80,40);
        labelPassWord.setBackground(Color.white);
        labelPassWord.setForeground(Color.blue);
        add(labelPassWord); // add label1 to web page
        
        
        textPassWord = new TextField();
        textPassWord.setBounds(300,100,80,30);
        textPassWord.setEchoChar('*');
        add(textPassWord);
        
        buttonLogin = new Button();
        buttonLogin.setLabel("Login");
        buttonLogin.setBounds(390,100,60,30);
        buttonLogin.setBackground(Color.white);
        buttonLogin.setForeground(Color.blue);
        add(buttonLogin);
        
        buttonEnterDetails = new Button();
        buttonEnterDetails.setLabel("Enter Details");
        buttonEnterDetails.setBounds(8,152,86,32);
        buttonEnterDetails.setBackground(Color.white);
        buttonEnterDetails.setForeground(Color.blue);
        
        add(buttonEnterDetails);
        
        buttonUpdateDetails = new Button();
        buttonUpdateDetails.setLabel("Update Details");
        buttonUpdateDetails.setBounds(104,152,86,32);
        buttonUpdateDetails.setBackground(Color.white);
        buttonUpdateDetails.setForeground(Color.blue);
        
        add(buttonUpdateDetails);
        
        buttonContactAdmin = new Button();
        buttonContactAdmin.setLabel("ContactAdmin");
        buttonContactAdmin.setBounds(200,152,86,32);
        buttonContactAdmin.setBackground(Color.white);
        buttonContactAdmin.setForeground(Color.blue);
        
        add(buttonContactAdmin);
        
        buttonSearchForBook = new Button();
        buttonSearchForBook.setLabel("Search");
        buttonSearchForBook.setBounds(300,152,86,32);
        buttonSearchForBook.setBackground(Color.white);
        buttonSearchForBook.setForeground(Color.blue);
        
        add(buttonSearchForBook);
        
        ourButtonListener = new ButtonListener();
        buttonEnterDetails.addActionListener(ourButtonListener);
        buttonUpdateDetails.addActionListener(ourButtonListener);
        buttonContactAdmin.addActionListener(ourButtonListener);
        buttonSearchForBook.addActionListener(ourButtonListener);
        buttonLogin.addActionListener(ourButtonListener);
        
    }
    
    class ButtonListener implements ActionListener
    {
        public void actionPerformed(ActionEvent event)
        {
            Object press = event.getSource();
            if(press == buttonLogin)
            {
                buttonLogin_ActionPerformed(event);
            }
        }
    }
    
    void buttonLogin_ActionPerformed(ActionEvent event)
    {
        if(textUserName.getText().equalsIgnoreCase("phillipa") &&
                textPassWord.getText().equalsIgnoreCase("flynn"))
        {
            JOptionPane.showMessageDialog(null,"Welcome to Babes in the Books!!");
            
        }
        
        else if(!(textUserName.getText().equalsIgnoreCase("phillipa") &&
                textPassWord.getText().equalsIgnoreCase("flynn")))
        {
            JOptionPane.showMessageDialog(null,"Invalid Username and/or Password");
            
        }
    }
 }

Enjoy.