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--  作者：admin --  发布时间：2008/3/17 8:35:26 --  程序代码——带有验错功能的猜数字小游戏 public class exec {           public static void main(String args[])     {         //设置随机数         int rnd=(int)(Math.random()*100)+1;                  //设置统计次数         int counter=1;                        while(true)         {             String str=javax.swing.JOptionPane.showInputDialog("Please input the number:");                          //判断是否没有输入或者输入为空，如果是则退出             if(str==null || str.equals(""))             {                 javax.swing.JOptionPane.showMessageDialog(null,"No input!");                   break;             }                                        //判断输入的内容是否不为数字，如果是则退出             char[] sarray =str.toCharArray();             for(int c=0;c<sarray.length;c++)                 if(!Character.isDigit(sarray[c]))                 {                     javax.swing.JOptionPane.showMessageDialog(null,"Error input!");                       System.exit(0);                     }                                         int i=Integer.parseInt(str);                          //三重判断             if(i<rnd)                 javax.swing.JOptionPane.showMessageDialog(null,"<");             else if(i>rnd)                 javax.swing.JOptionPane.showMessageDialog(null,">");             else             {                 javax.swing.JOptionPane.showMessageDialog(null,"Succeed!\\nYou get it in "+ counter + " times!");                         break;             }             counter++;         }                  //退出主程序，关闭窗体资源         System.exit(0);     } } [此贴子已经被作者于2010-12-12 08:23:17编辑过]