java(GUI)图形接口编程求教

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class windchill implements ActionListener
{
private static final int WINDOW_WINTH=350;
private static final int WINDOW_HEIGHT=185;

private static final int AREA_WINTH=40;
private static final int FIELD_WINTH=20;

private static final Flowlayout LAYOUT_STYLE=new Flowlayout();

private static final String LEGEND="This windchill calculatie is intended foe velocitoies great than 4 mph";

//实例变量

//GUI的窗口
private JFrame window=new JFrame("WIndchill calulator");

//图例
private JTextArea lengend=new JFextArea(LEGEND,2,AREA_WINTH);

//温度的用户输入区域
private JLabel fahrTrg=new JLabel("Fahrenheit temperature");
private JTextField fahrText=new JTextField(FIFLD_WINTH);