converttemp.java

《A first book of java》by Gary J.Bronson 北大出版社

import javax.swing.*;
public class ConvertTemp
{
  public static void main (String[] args) 
  {
     String fahr, output;
     double tempfahr, celsius;
     fahr = JOptionPane.showInputDialog("Enter a Fahrenheit Temperature:");
    
     tempfahr = Double.parseDouble(fahr);
     celsius = 5.0/9.0 * (tempfahr - 32);
     
     output = "The equivalent Celsius temperature for " + tempfahr
            + " degrees Fahrenheit is " + celsius;
     JOptionPane.showMessageDialog(null, output, "Program 3.14",
                                   JOptionPane.INFORMATION_MESSAGE);
    System.exit(0);
 }
}