method not abstract

[bothwell muyambo]

i am trying to create an applet with drop-down lists. when i compile the program the following error message appears '. . .is not abstract and doesnt overide abstract method actionPerformed. . . Here is my code . . . .help please

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class DavidApplet extends Applet implements ActionListener //class header
{
	Label fName=new Label("First Name");
	TextField fNameField=new TextField(15);
	Label lName=new Label("Last Name");
	TextField lNameField=new TextField(15);
	Label address=new Label("Address");
	TextField addressField=new TextField(15);
	Label city=new Label("City");
	TextField cityField=new TextField(15);
	Label stateName=new Label("State");
	TextField stateField=new TextField(15);
	Choice vehicle=new Choice();
	Choice hookups=new Choice();
	Label arrival=new Label("Arrival");
	TextField arrivalField=new TextField(15);
	Label nights=new Label("Nights");
	TextField nightsField=new TextField(15);
	Label zip=new Label("Zip");
	TextField zipField=new TextField(15);
	Button submitButton=new Button("Submit");
	Button clearButton=new Button("Clear");

	public void init()
	{
		Color mine=new Color(255,100,50);
		setBackground(mine);
		this.setLayout(new GridLayout(6,4));
		add(fName);
		add(fNameField);
		add(vehicle);
		vehicle.add("tent");
		vehicle.add("pop-up");
		vehicle.add("travel trailer");
		vehicle.add("fifth-wheel");
		vehicle.add("motor home");
		add(lName);
		add(lNameField);
		add(hookups);
		hookups.add("water only");
		hookups.add("water and electricity");
		hookups.add("full hookups");
		hookups.add("no hookups");
		add(address);
		add(addressField);
		add(arrival);
		add(arrivalField);
		add(city);
		add(cityField);
		add(nights);
		add(nightsField);
		add(stateName);
		add(stateField);
		add(zip);
		add(zipField);
		add(submitButton);
		submitButton.addActionListener(this);
		add(clearButton);
		clearButton.addActionListener(this);
	}

	public void actionPerfomed(ActionEvent e)
	{
		String arg=e.getActionCommand();
		if(arg=="Submit")
		{

		}
		if(arg=="Clear")
		{

		}
	}
}

[Edit - added code tags - MB]

[John Jai]

The class implements the ActionListener but the abstract method actionPerformed() is not implemented. Check your method signature.

[bothwell muyambo]

i am very new to java and would want some more clarification on the implementation part and avoiding this error message. thank you

[Matthew Brown]

John's just pointed you in the right direction.

ActionListener is an interface. Any (non-abstract) class implementing an interface must provide an implementation of every method in the interface. ActionListener contains a method "actionPerformed", whereas you have implemented "actionPerfomed". Just a small spelling mistake, but these things matter.

Incidentally, you have other problems as well. Never use == to check for String equality, use the equals() method instead.

[John Jai]

When you implement an interface you have to either implement the methods or mark the methods abstract. In your code you have actually tried to implement the method actionPerformed(). But the name of the method is incorrect. You have missed a 'r'.

[bothwell muyambo]

a big thank you to john and mathew.The problem has been fixed thank you

[Tim Moores]

Here's a very useful bit of advice: learn to use @Override annotations, whenever you override or implement methods. Big timesaver for exactly the kind of mistake you made here!

http://download.oracle.com/javase/tutorial/java/javaOO/annotations.html

[bothwell muyambo]

Thank you Tim. I am on it now. . .

[Gitch joseph]

Thanks Mathew that was of great help

[Campbell Ritchie]

And welcome to the Ranch

I presume you noticed the dubious design, using addActionListener(this)?

[Ryan Daguman]

Ah I've already encountered this program before. My DavidApplet class program worked well though the design is clumsy because I did not create any layout manager.