摄氏温度和华氏温度的互换（Convert between Celsius and Fahrenheit temperature）

来源：互联网发布：淘宝村小二编辑：程序博客网时间：2024/06/06 19:01

Java Applet，可实现摄氏温度和华氏温度的一键换算：

package example;//Convert between Celsius and Fahrenheit temperature//Java how to program, 5/e, Exercise 6.23//Neglect the error message when closing the applet since it is a JDK bug (id:5098186)import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.text.*;public class Celsius_Fahrenheit extends JApplet implements ActionListener {double celsius,fahrenheit;String celsiusText,fahrenheitText;JLabel CelsiusLable,FahrenheitLable;JTextField CelsiusField,FahrenheitField;DecimalFormat twoDigits=new DecimalFormat("0.00");public void init(){      Container  container=getContentPane();   container.setLayout(new FlowLayout());      CelsiusLable= new JLabel("Enter Celsius Temperature:");   container.add(CelsiusLable);      CelsiusField=new JTextField(10);   container.add(CelsiusField);      CelsiusField.addActionListener(this);      FahrenheitLable= new JLabel("Enter Fahrenheit Temperature:");   container.add(FahrenheitLable);      FahrenheitField=new JTextField(10);   container.add(FahrenheitField);      FahrenheitField.addActionListener(this);      }public void actionPerformed (ActionEvent event){   if (event.getSource()==CelsiusField)  {       celsius=Double.parseDouble(CelsiusField.getText());       fahrenheit=celsius*9.0/5.0+32;       fahrenheitText=twoDigits.format(fahrenheit);       FahrenheitField.setText(fahrenheitText);   }   else if (event.getSource()==FahrenheitField)   {       fahrenheit=Double.parseDouble(FahrenheitField.getText());       celsius=(fahrenheit-32)*5.0/9.0;       celsiusText=twoDigits.format(celsius);       CelsiusField.setText(celsiusText);   }  }}

运行截屏：