Event handling... help?

[kevzspeare]

I'm trying to add events in my program. Here is my code:

import java.io.*;
import java.awt.*;
import java.awt.event.*;

public class MainProgram
{
	String name0x1;
	TravellingPackage prog[] = new TravellingPackage[10];
	Frame phi;
	Button beta;
	Choice tau;
	TextField alpha1, alpha2, alpha3, nu, chi;
	Label lambda, lambda2, theta1, theta2, theta3,
	theta3a, theta3b, theta3c, theta4;
	Panel header, pi, pi2, pi3, pi3a, pi4, pi5, footer;
	public static void main (String args[]) throws IOException
	{
		MainProgram main = new MainProgram();
		main.addComponents();
	}
	public void addComponents()
	{
		File data = new File ("report.txt");
		int q = 0;
		phi = new Frame("MKDL Travel Agency System Ver. I");
		phi.setLayout(null);
		phi.setSize(500,500);
		phi.setResizable(false);
		phi.setLocation(100,100);
		phi.setBackground(Color.gray);
		header = new Panel();
		pi = new Panel();
		pi2 = new Panel();
		pi3 = new Panel();
		pi3a = new Panel();
		pi4 = new Panel();
		pi5 = new Panel();
		footer = new Panel();
		header.setSize(400,50);
		header.setLocation(50,50);
		header.setBackground(Color.orange);
		pi.setSize(400,50);
		pi.setLocation(50,100);
		pi.setBackground(Color.blue);
		pi2.setSize(400,50);
		pi2.setLocation(50,150);
		pi2.setBackground(Color.red);
		pi3.setSize(400,50);
		pi3.setLocation(50,200);
		pi3.setBackground(Color.yellow);
		pi3a.setSize(400,50);
		pi3a.setLocation(50,250);
		pi3a.setBackground(Color.yellow);
		pi4.setSize(400,50);
		pi4.setLocation(50,300);
		pi4.setBackground(Color.magenta);
		pi5.setSize(400,50);
		pi5.setLocation(50,350);
		pi5.setBackground(Color.green);
		footer.setSize(400,50);
		footer.setLocation(50,400);
		footer.setBackground(Color.pink);
		beta = new Button("Calculate Fare");
		tau = new Choice();
		lambda = new Label("MKDL Travel Agency System Ver. I");
		lambda2 = new Label("(C) 2009 MKDL Studios. All rights reserved.");
		alpha1 = new TextField("",2);
		alpha2 = new TextField("",2);
		alpha3 = new TextField("",2);
		theta1 = new Label("Agent's Name");
		theta2 = new Label("Travelling Method");
		theta3 = new Label("Number of Tourists");
		theta3a = new Label("Age Below 2");
		theta3b = new Label("Age 2-16");
		theta3c = new Label("Age Above 16");
		theta4 = new Label("Total Fare:");
		nu = new TextField("",30);
		chi = new TextField("",20);
		tau.add("Bus");
		tau.add("Cruise");
		tau.add("Airplane");
		beta = new Button("Calculate Fare");
		header.add(lambda);
		pi.add(theta1);
		pi.add(nu);
		pi2.add(theta2);
		pi2.add(tau);
		pi3.add(theta3);
		pi3a.add(theta3a);
		pi3a.add(alpha1);
		pi3a.add(theta3b);
		pi3a.add(alpha2);
		pi3a.add(theta3c);
		pi3a.add(alpha3);
		pi4.add(beta);
		pi5.add(theta4);
		pi5.add(chi);
		footer.add(lambda2);
		phi.add(header);
		phi.add(pi);
		phi.add(pi2);
		phi.add(pi3);
		phi.add(pi3a);
		phi.add(pi4);
		phi.add(pi5);
		phi.add(footer);
		phi.setVisible(true);
	}
	
}

But if I add "implements ActionListener" at the end of the class name like this:

public class MainProgram implements ActionListener

an error message is displayed:

--------------------Configuration: <Default>--------------------
E:\mkdl\archive1\jp219\MainProgram.java:5: MainProgram is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener
public class MainProgram implements ActionListener
       ^
1 error

Process completed.

What should I do??

[DarrylBurke]

Recommended reading:
What Is an Interface? (The Java™ Tutorials > Learning the Java Language > Object-Oriented Programming Concepts)
How to Write an Action Listener (The Java™ Tutorials > Creating a GUI with JFC/Swing > Writing Event Listeners)

db

[Fubarable]

The tutorials will tell you that if a class implements in interface, then it must actually implement the methods of the interface, something your class is not doing. Reading the links that Darryl has generously provided for you will tell you how to do this and why it's important.