Event handling

[outofmymind]

Hi there,

I did this program, but, im having problems with attaching the events. i want the total bill amount to be calculated when i click the ‘OK’ button, and i need it to be displayed in the window. The problem is that I dont know why I dont get why its not adding the total bill of what i selected. It only displays "Total: 0"


im assuming that:

Sandwich = $2 per unit
Tea – $1 per unit
Coke – $1 per unit

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
 
 
 
public class Cafeamr extends JApplet  implements ActionListener{
private JButton b1, b2; 
private JCheckBox c1, c2, c3;
//private JRadioButton c5, c6, c7;
private JComboBox q;
private JLabel label1, label2,label3,label4,label5;
private JPanel p1, p2, p3, p4, p5, p6, p7, p8;
private JTextField textbox1,textbox2,textbox3;
 
    public Cafe()
    {
       // build left north panel
       label1 = new JLabel( "Cafe:  My Cafe" );
       p1 = new JPanel();
       p1.setLayout( new FlowLayout( FlowLayout.LEFT ) );
       p1.add( label1 );
 
       // build right east panel
       b1 = new JButton( "Ok" );
       b1.addActionListener(this);
       b2 = new JButton( "Cancel" );
       b2.addActionListener(this);
       p2 = new JPanel();
       p2.setLayout( new GridLayout( 2, 1, 5, 5 ) );
 
       p2.add( b1 );
       p2.add( b2 );
 
       // build left south panel
       label2 = new JLabel( "Payment Mode: " );
       q = new JComboBox();
       q.addItem( "Cash" );
       q.addItem("Credit Card");
       p3 = new JPanel();
       p3.setLayout( new FlowLayout( FlowLayout.LEFT, 10, 0 ) );
       p3.add( label2 );
       p3.add( q );
 
 
       // build left east panel
       label3=new JLabel("Item");
       c1 = new JCheckBox( "Sandwich" );
       c2 = new JCheckBox( "Tea" );
       c3 = new JCheckBox( "Coke" );
       p4 = new JPanel();
       p4.setLayout( new GridLayout(4,1,3,3 ) );
       p4.add(label3);
       p4.add(c1);
       p4.add(c2);
       p4.add(c3);
 
       // build left west panel
       p5 = new JPanel();
       p5.setLayout( new GridLayout(4,1,5,5) );
       label4=new JLabel("Quantity");
       textbox1=new JTextField(2);
 
       textbox2=new JTextField(2);
 
       textbox3=new JTextField(2);
 
       p5.add(label4);
       p5.add(textbox1);
       p5.add(textbox2);
       p5.add(textbox3);
 
 
       // build left center
       p8 = new JPanel();
       p8.setLayout( new FlowLayout( FlowLayout.CENTER, 30, 0 ) );
      // p8.setBackground( Color.white );
       p8.add( p4 );
       p8.add( p5 );
 
 
       // setup left panel
       p6 = new JPanel();
       p6.setLayout( new BorderLayout() );
       p6.add( p1, BorderLayout.NORTH );
       p6.add( p8, BorderLayout.CENTER );
       p6.add( p3, BorderLayout.SOUTH );
 
       // setup applet layout
       p7 = new JPanel();
       p7.setLayout( new FlowLayout( FlowLayout.CENTER, 10, 5 ) );
       p7.add( p6 );
       p7.add( p2 );
       getContentPane().add( p7 );
 
       setSize( 400, 250 );
       show();
    }
 
    public void actionPerformed (ActionEvent d)
    {
        if(d.getSource() ==b1){
            int total= 0;
            int SP = 2;
            int TP = 1;
            int CP = 1;
            //if (d.getSource())
 
            try
            {
                if (c1.isSelected()==true){
                   String B1 = textbox1.getText();
                    int b1 = Integer.parseInt(B1);
                  total = total + (b1 * SP);
                }
 
                if (c2.isSelected()==true){
                    String B2 = textbox2.getText();
                    int b2 = Integer.parseInt(B2);
                      total = total + (b2 * TP);
                }
 
                if (c3.isSelected()==true){
                    String B3 = textbox1.getText();
                    int b3 = Integer.parseInt(B3);
                      total = total + (b3 * CP);
                }
            }
            catch(Exception e) {
                e.printStackTrace();
            }
             label5 = new JLabel( "Total: "+ total );
             p7.add(label5);
             validate();
            System.out.println(total);
        } // ok button
        else {
            System.exit(1);
        }
 
 
}
    public void init()
    {
        new Cafe();
    }
}

Thanks in advance and i hope you guys can help me out,

cheers

outofmymind

[horace1]

The only problem I noticed was the class was called Cafeamr

public class Cafeamr extends JApplet  implements ActionListener{
 

and the constructor was called Cafe

        public Cafe()
 

once I changed the class name to Cafe and ran it with AppletViewer the program worked OK - I entered the quantity in the JTextField, clicked on the item box and then OK and the Total was correct.

[r035198x]

The only problem I noticed was the class was called Cafeamr

public class Cafeamr extends JApplet implements ActionListener{
 

and the constructor was called Cafe

        public Cafe()
 

once I changed the class name to Cafe and ran it with AppletViewer the program worked OK - I entered the quantity in the JTextField, clicked on the item box and then OK and the Total was correct.

The code should also not have compiled.

[outofmymind]

The code should also not have compiled.

Thanks for your help r035198x ! :) :)...it worked

outofmymind

[r035198x]

Thanks for your help r035198x ! :) :)...it worked

outofmymind

You should thank horace1 there. He is the one who gave you the solution. I merely pointed out that your version could not possibly compile.