I have been troubled about my program how to put some funtionalities regarding on my buttons can anybody can help me?

In button compute I have to put some computation regarding on (weight*perounce)+others;

then for the button clear I have to clear all the inputed data in the textfield;

then for the button exit I have to exit the application/GUI;

then for the button add I have to add the data being compute in regarding of what type of package(Overnight package or Two day Packge) he/she selected, then I have to put it in a array that will be use by my button display;

In my button display if i select one or any of the two packages then it will display the list of customers who avail in that certain package..

then I have also some trouble on how can i use a autonumbering for my tracking number...and how can i drop the list in my combo box Package type....

fortunately, here are the codes that i have already finished..

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class PackageGUI extends JFrame
{
private JLabel lblTrackingNo,lblName,lblAddress,lblCity,lblState,lblZipCode,lblPackageType,lblWeight,lblPerounce,lblOthers,lblPayment;
private JTextField txtTrackingNo,txtName,txtAddress,txtCity,txtState,txtZipCode,txtWeight,txtPerounce,txtOthers,txtPayment;
private JButton btnCompute,btnAdd,btnClear,btnExit;
private JComboBox PackageType,Display;
String [] packName={"Over Night Package","Two Day Package"};
String [] displayType={"Over Night Package","Two Day Package"};
private Panel p1;
private Panel p2;


public PackageGUI()
{
  super("Compute per Package");
  setSize(600,600);

  lblTrackingNo=new JLabel("Tracking No.");
  lblName=new JLabel("Name");
  lblAddress=new JLabel("Address");
  lblCity=new JLabel("City");
  lblState=new JLabel("State");
  lblZipCode=new JLabel("Zip Code");
  lblPackageType=new JLabel("Package Type");
  lblWeight=new JLabel("Weight");
  lblPerounce=new JLabel("Per Ounce");
  lblOthers=new JLabel("Others");
  lblPayment=new JLabel("Payments");

  txtTrackingNo=new JTextField(10);
  txtName=new JTextField(10);
  txtAddress=new JTextField(10);
  txtCity=new JTextField(10);
  txtState=new JTextField(10);
  txtZipCode=new JTextField(10);
  txtWeight=new JTextField(10);
  txtPerounce=new JTextField(10);
  txtOthers=new JTextField(10);
  txtPayment=new JTextField(10);
  txtPayment.setEditable(false);
  PackageType=new JComboBox(packName);
  Display=new JComboBox(displayType);

  btnCompute=new JButton("Compute");
  btnAdd=new JButton("Add");
  btnClear=new JButton("Clear");
  btnExit=new JButton("Exit");


  p1=new Panel(new GridLayout(11,3));
  p1.add(lblTrackingNo);
  p1.add(txtTrackingNo);
  p1.add(lblName);
  p1.add(txtName);
  p1.add(lblAddress);
  p1.add(txtAddress);
  p1.add(lblCity);
  p1.add(txtCity);
  p1.add(lblState);
  p1.add(txtState);
  p1.add(lblZipCode);
  p1.add(txtZipCode);
  p1.add(lblPackageType);
  p1.add(PackageType);
  p1.add(lblWeight);
  p1.add(txtWeight);
  p1.add(lblPerounce);
  p1.add(txtPerounce);
  p1.add(lblOthers);
  p1.add(txtOthers);
  p1.add(lblPayment);
  p1.add(txtPayment);

  p2=new Panel(new GridLayout(5,1));
  p2.add(btnCompute);
  p2.add(btnAdd);
  p2.add(btnClear);
  p2.add(btnExit);
  p2.add(Display);



  Container pane=getContentPane();
  pane.setLayout(new FlowLayout());
  pane.add(p1,BorderLayout.WEST);
  pane.add(p2,BorderLayout.EAST);
  setVisible(true);
  setDefaultCloseOperation(EXIT_ON_CLOSE);
  pack();

  }

  public static void main(String[]args)
  {
    PackageGUI p=new PackageGUI();
  }
  }

I would suggest you read this tutorial on event handling:

sun tutorial

This has the information you need.

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