GUI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 JTextArea(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(FIELD_WINTH);
     
     //风速的用户输入区域
     private JLabel windTrg=new JLabel ("      Windspeed (mph) ");
     private JTextField  windText=new JTextField(FIELD_WINTH);
     
     //温度接果的输入区域
     private JLabel chillTrg =new JLabel("Windchill temperature");
     private JTextField chillText=new JTextField(FIELD_WINTH);
     
     //运行按钮
     private JButton runButton=new JButton("run");
     
     //Windchill构造方法
     public void windchill()
     {
             window.setSize(WINDOW_WINTH,WINDOW_HEIGHT);
             window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //     window.setVisble(true);
             
             lengend.setEditable(false);
             lengend.setLineWrap(true);
             lengend.setWrapStyleWord(true);
             lengend.setBackground(window.getBackground());
             
             chillText.setEditable(false);
             chillText.setBackground(Color.WHITE);
             
             //注册事务监听器
             runButton.addActionListener(this);
             
             //向容器增加构件
             Container c=window.getContentPane();
             c.setLayout(LAYOUT_STYLE);
             
             c.add(lengend);
             c.add(fahrTrg);
             c.add (fahrText);
             c.add(windTrg);
             c.add(windText);
             c.add(chillTrg);
             c.add(chillText);
             c.add(runButton);
             
             //显示GUI 
             window.show();  
                 
     }    
     //actionperformend
     
     public void actionperformend(ActionEvent e)
     {
             String response1=fahrText.getText();
             double t=Double.parseDouble(response1);
             String response2=windText.getText();
             double v=Double.parseDouble(response2);
             
             //计算温度
             double  windchillTemperature=0.081*(t-91.4)*(3.71*Math.sqrt(v)+5.81-0.25*v)+91.4;
             int perceivedTemperature=(int) Math.round(windchillTemperature);
             
             //显示温度
             String output=String.valueOf(perceivedTemperature);
             chillText.setText(output);
       }
       //main函数入口
       public static void main(String [] args)
       {
       
               windchill gui=new windchill();
       }
}