Cannot find symbol errors question

[zlloyd1]

I am trying to write some simple code in an attempt to gain some much needed knowledge of the java language, but I am getting errors that I cannot understand when I try to compile my program.... This is my code:

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

public class Test extends JFrame{
public static void main(String[] args){
JFrame box = new JFrame();
box.setTitle("Week1 test");
box.setSize(240,240);
box.setVisible(true);
box.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel label = new JLabel("Hello World");
label.setSize(160,160);
label.setVisible(true);
box.add(label);
JButton B1 = new JButton("Exit");
B1.setVisible(true);
box.add(B1);
box.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
System.Exit(0);}
});}}

and these are the errors that the compiler is throwing at me when I try to check the code:

Test.java:22: error: cannot find symbol
System.Exit();}
^
symbol: method Exit(int)
location: class System

Test.java:20: error: cannot find symbol
box.addActionListener(new ActionListener(){
^
symbol: method addActionListener((anonymous ActionListener))
location: variable box of type JFrame

I cannot understand what is wrong here, I mean I imported the javax.swing.*; which I thought had all of the action and event listeners contained within. I mean, I am not exactly sure about System.Exit(), but addActionListener I am pretty sure is correct for what I am trying to do. I have created a JFrame, and added a JLabel, and a JButton to it, but I need the button to actually do something, to close the window when pressed. I have been advised that action listeners are how to do this, and that if I import the swing library, I can use them in my code. Unfortunately the compiler has a different idea, and won't recognize these as existing java operations.
PLEASE, I am very new to java, and really need to be able to figure out how to use the language, any help would be GREATLY appreciated!!

[KevinWorkman]

Where is the Exit() method of the System class? Note: case matters.

Where is the addActionListener() method of JFrame? When would that be triggered?