ex2_4.java

Introduction to java programming 一书中所有编程练习部分的源码

import javax.swing.JOptionPane;

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/**
 *
 * @author xiaolei
 */
public class EX2_4 {
     public static void main(String[] args) {
         double pound, kilogram;
         pound = Double.parseDouble(JOptionPane.showInputDialog("输入磅数："));
         kilogram = 0.454 * pound;
         JOptionPane.showMessageDialog(null, "结果："+kilogram);
    }

}