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.