public class Temperature
{public Temperature(){}
 public static double fahrTocels()
 {return(5.0*(temp-32.0)/9);
}
 public static double celsTofahr()
 {return(9.0*temp/5.0+32.0);
}//温度转换
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
pubic class TemperatureUI
{private JTextField inField=new JTextField(15);
 private JTextField resultField=new JTextField(15);
 private JLabel prompt1=new JLabel("input Temperature>>");
 private JLabel prompt2=new JLabel("Conversion Result:");
 private JButton fahrToCels=new JButton("F TO C");
 private JButton celsToFahr=new JButton("C TO F");
 private JPanel panelN=new JPanel();
 private JPanel panelC=new JPanel();
 private JPanel panelS=new JPanel();
 private Temperature temperature=new Temperature();
}//
public class TemperatureJPanel()
{setLayout(new borderLayout);
 panelN.setLayout(new borderLayout);
 panelC.setLayout(new borderLayout);
 panelS.setLayout(new borderLayout);
 panelN.add("north",prompt1);
 panelN.add("south",inField);
 panelC.add("west",fahrToCels);
 panelC.add("east",celsToFahr);
 panelS.add("north",prompt2);
 panelS.add("south",resultField);
 add("north",panelN);
 add("center",panelC);
 add("south",panelS);
 celsToFahr.addActionListener(this);
 fahrToCels.addActionListener(this);
 setSize(170,200);
}
public void actoinPerformed(ActionEvent e)
{String inputStr=inField.getText();
 double userInput=double.parsDouble(inputStr);
 double result=0;
 if(e.sourth==celsToFahr)
{result=temperater.celsToFahr(userIput);
 resultField.setText(inputStr"+C="result+"F");
}
 if(e.sourth==fahrToCels)
{result=temperature.fahrToCels(userInput);
 resultField.setText(inputStr+"F="result+"C");
}//GUI界面
}