Thread: Help with elections program

Hey guys..I am not able to find the solution of the problem in my applet. It displays the buttons for only one category and it is not going ahead with the program.
Please help me find the problem and solution...
My program is.....

import java.awt.*;     //Basic hierarchy of packages for native GUI components
import java.applet.*;    //Package for creating an applet
import java.awt.event.*; 
import java.awt.event.MouseListener;
public  class App extends Applet implements MouseListener 
{
    String HY="Head Boy";
    String HL="Head Girl";
    String SY="Sports Prefect Boy";
    String SL="Sports Prefect Girl";
    String CHC="Cheetah House Captain";
    String CHVC="Cheetah House Vice-Captain";
 
    String HB11="Arnav Kholkar";
    String HB12="Chinmay Patwardhan";
    String HB13="Ishan Joshi";
    String HB14="Sumedh Sontakke";
 
    String HG11="Avani Awasthee";
    String HG12="Chaiti Bhagwat";
    String HG13="Rucha Kalekar";
    String HG14="Smruti Pimplikar";
 
    String SPB11="Anuj Kankaria";
    String SPB12="Arnav Kholkar";
    String SPB13="Chinmay Patwardhan";
    String SPB14="Yogesh Sirvi";
 
    String SPG11="Disha Trivedi";
    String SPG12="Manasi Gokhale";
    String SPG13="Shivani Gupta";
    String SPG14="Shruti Jani";
 
    String C11="Shaunak Chitgopkar";
    String C12="Shivani Gupta";
    String C13="Smruti Pimplikar";
    String C14="Surinder Mathrani";
 
    String VC11="Arya Prabhudesai";
    String VC12="Atharva Mahajan";
    String VC13="Chinmay Kalluraya";
    String VC14="Manasi Deshpande";
 
    int HB1,HB2,HB3,HB4,HG1,HG2,HG3,HG4,SPB1,SPB2,SPB3,SPB4,SPG1,SPG2,SPG3,SPG4,C1,C2,C3,C4,VC1,VC2,VC3,VC4;
    int tie; //Variable that checks whether two or more candidates received the same number of votes. 
    Font font;   //Allows the message to be printed in a specific font 
    Button button,H1,H2,H3,H4; //The buttons used for selecting the choice    
    Label label,title,HB,HG;
    Panel P1,P2,P3,P4; // area where the buttons can be displayed
    public void init() //Initialising Method for Applet
    {
        addMouseListener(this);
        setLayout (new BorderLayout ());
        P1 = new Panel (new BorderLayout ());
        P2 = new Panel (); 
        P3 = new Panel ();
        P4 = new Panel ();
        font = new Font ("ComicSans", Font.BOLD, 17);
        setFont (font);
        this.setBackground(Color.yellow);
        label= new Label("Welcome to Vidya Valley School Elections");
        HB = new Label (HY);
        HG= new Label(HL);
        HB.addMouseListener (this);
        add (P1, "North");
        P1.add (P2, "North");
        P2.add (label);
        label.setBackground(Color.black);
        label.setForeground(Color.green);
        HB.setBackground(Color.white);
        HB.setForeground(Color.black);
        H1= new Button (HB11);
        H1.addMouseListener (this);
        H2= new Button (HB12);
        H2.addMouseListener (this);
        H3= new Button (HB13);
        H3.addMouseListener (this);
        H4= new Button (HB14);
        H4.addMouseListener (this);
        P1.add (P3,"West");
        P3.add (HB);
        P3.add (H1);
        P3.add (H2);
        P3.add (H3);
        P3.add (H4);
    }
 
    public void mouseClicked(MouseEvent e)
    {
        if(e.getSource () == H1)
        {
            P1.add(P4,"West");
            P4.add(HG);
        }
    }
    // methods used for applet installment and destruction
    public void start() 
    {
        System.out.println(" Applet Starting ");
    }
 
    public void stop() 
    {
        System.out.println(" Applet Stopping ");
    }
 
    public void destroy() 
    {
        System.out.println(" Applet Destroyed ");
    }
 
    //These are not used but are necessary for mouseListener
    public void mouseEntered (MouseEvent e)
    {
    }
 
    public void mouseExited (MouseEvent e)
    {
    }
 
    public void mousePressed (MouseEvent e)
    {
    }
 
    public void mouseReleased (MouseEvent e)
    {
    }
 
}

Originally Posted by Norm

Please explain what happens when you execute the program.
What do you do and what does the program do in response?
What do you want the program to do differently?


Please copy and paste here the full text of any error messages.

When I execute..The Label Vidya Valley School Elections is displayed.
The label Head Boy is also displayed and along with it 4 buttons are also displayed.
If I click on the first button nothing happens...I have a given a condition in the method mouseClicked(MouseEvent e), I'm not sure if it is right
The program doesn't execute anything further on clicking the buttons
I want the program to display the next set of buttons for the label: Head Girl.

Originally Posted by Norm

Is the listener called when you click on the button? Add a call to println() in the listener method to print out a message when the listener is called. Then if the message is printed you'll know the listener was called.

Normally you use an ActionListener with buttons to detect when they are clicked.

I have tried printing a message but nothing happens..I guess the listener is not being called.
Should I convert it to ActionListener?

Originally Posted by Norm

Where did you put the println() statement? In what methods? Where did move and click the mouse?

Yes you should use ActionListeners with buttons.

I put the println() statement in mouseClicked method.
I clicked the mouse on the buttons

Originally Posted by Norm

There should be something printed out when the mouse was clicked.
What about all the other mouse listener methods? Did you add printlns there?

Where did you look to see what was printed?

Here is some of what I see when the code is executed and the mouse moved:

Okay I have no idea what you did...but now I made a similar coded class with ActionListener
It is pretty much the same just without the other methods that were there for mouseListener.
Also..what did you do that got you this above code?

Originally Posted by Norm

I added println statements to all the mouse listener methods.
When I executed the program and moved the mouse over the window, the above messages were printed out.

Do you see any of the messages that the program prints out? For example this one:
Applet Starting

If not, then you are not looking in the right place to see the print outs. In a browser, the print outs are shown in the browser's java console.

I see the message Applet Starting in the terminal window. I am using the applet viewer.
Now that I have made the program into ActionListener, what difference does it make and yet the buttons are not being clicked.

The updated version:

import java.awt.*;     //Basic hierarchy of packages for native GUI components
import java.applet.*;   //Package for creating an applet
import javax.swing.*;
import java.awt.event.*; 
import java.awt.event.ActionListener;
public  class App1 extends JApplet implements ActionListener 
{
    String HY="Head Boy";
    String HL="Head Girl";
    String SY="Sports Prefect Boy";
    String SL="Sports Prefect Girl";
    String CHC="Cheetah House Captain";
    String CHVC="Cheetah House Vice-Captain";
 
    String HB11="Arnav Kholkar";
    String HB12="Chinmay Patwardhan";
    String HB13="Ishan Joshi";
    String HB14="Sumedh Sontakke";
 
    String HG11="Avani Awasthee";
    String HG12="Chaiti Bhagwat";
    String HG13="Rucha Kalekar";
    String HG14="Smruti Pimplikar";
 
    String SPB11="Anuj Kankaria";
    String SPB12="Arnav Kholkar";
    String SPB13="Chinmay Patwardhan";
    String SPB14="Yogesh Sirvi";
 
    String SPG11="Disha Trivedi";
    String SPG12="Manasi Gokhale";
    String SPG13="Shivani Gupta";
    String SPG14="Shruti Jani";
 
    String C11="Shaunak Chitgopkar";
    String C12="Shivani Gupta";
    String C13="Smruti Pimplikar";
    String C14="Surinder Mathrani";
 
    String VC11="Arya Prabhudesai";
    String VC12="Atharva Mahajan";
    String VC13="Chinmay Kalluraya";
    String VC14="Manasi Deshpande";
 
    int HB1,HB2,HB3,HB4,HG1,HG2,HG3,HG4,SPB1,SPB2,SPB3,SPB4,SPG1,SPG2,SPG3,SPG4,C1,C2,C3,C4,VC1,VC2,VC3,VC4;
    int tie; //Variable that checks whether two or more candidates received the same number of votes. 
    Font font;   //Allows the message to be printed in a specific font 
    JButton H1,H2,H3,H4; //The buttons used for selecting the choice    
    JLabel label,title,HB,HG;
    Panel P1,P2,P3,P4; // area where the buttons can be displayed
    public void init() //Initialising Method for Applet
    {
        setLayout (new BorderLayout ());
        P1 = new Panel (new BorderLayout ());
        P2 = new Panel (); 
        P3 = new Panel ();
        P4 = new Panel ();
        font = new Font ("ComicSans", Font.BOLD, 17);
        setFont (font);
        this.setBackground(Color.yellow);
        label= new JLabel("Welcome to Vidya Valley School Elections");
        HB = new JLabel (HY);
        HG= new JLabel(HL);
        add (P1, "North");
        P1.add (P2, "North");
        P2.add (label);
        label.setForeground(Color.black);
        HB.setBackground(Color.white);
        HB.setForeground(Color.black);
        H1= new JButton (HB11);
        H1.addActionListener (this);
        H2= new JButton (HB12);
        H2.addActionListener (this);
        H3= new JButton (HB13);
        H3.addActionListener (this);
        H4= new JButton (HB14);
        H4.addActionListener (this);
        P1.add (P3,"West");
        P3.add (HB);
        P3.add (H1);
        P3.add (H2);
        P3.add (H3);
        P3.add (H4);
    }
 
    public void actionPerformed(ActionEvent e)
    {
        if (e.getActionCommand().equals(HB11)) 
        {
            System.out.println("Button1 has been clicked");
        }
    }
    // methods used for applet installment and destruction
    public void start() 
    {
        System.out.println(" Applet Starting ");
    }
 
    public void stop() 
    {
        System.out.println(" Applet Stopping ");
    }
 
    public void destroy() 
    {
        System.out.println(" Applet Destroyed ");
    }
 
}

Originally Posted by Norm

Your println in the listener will only be called if the if statement is true. You are assuming you have coded the if correctly.

Add a println statement first thing in the listener method without any if statements to prevent it being executed.

I am pretty sure the if statement is correct...
If I add a println statement in the listener method nothing happens.
Is this because I am viewing it in applet viewer?

Originally Posted by Norm

I use appletviewer for testing and get this output:

What is printed on the console when you execute the applet?

I am unable to see the screen of the console, it opens and closes instantly .....
Based on what you get as an output..what should I do?

Originally Posted by Norm

You need to change the way you are testing so that the console screen remains open so you can see the debug output.
How are you executing the program?

I simply view the applet and try to change the syntax if the program is not running.
How should I execute the program?

Originally Posted by Norm

How do you execute the program you use to execute the applet?
Why does the "screen of the console, it opens and closes instantly"?
Please explain what you do step by step.

The screen of the console opens and closes immediately...no idea.
After compiling the code I run the applet. I make a note of what is being displayed and what is not.
I add a code to see if the button is being clicked.
If it works I try to design the rest of the program.
I am having a bit of trouble with the syntax.

Originally Posted by Norm

Please explain in detail what you do to open the console.


Please explain in detail what you do to "run the applet".

I use BlueJ and after compiling I run the applet by right-clicking the class.
I go to My Computer/Java/Jdk/Bin/Java.consoleto open the console

Originally Posted by Norm

To keep the console open, get out of BLuej.
open a command prompt console, issues commands to change to the folder with the html file that executes the applet and enter:

appletviewer TheHtmlThatExecutesTheApplet.html

When the appletviewer exits the command prompt window will still be open and you will be able to read what is displayed there.

Still not working