java实践：小游戏：猜数字、判断回文数 。
猜数字小游戏源码：
import java.util.*;public class Number{ public static void main(String args[]) { int number=0; int d5=0; int d4=0; int d3=0; int d2=0; int d1=0; Scanner reader=new Scanner(System.in); System.out.println("从键盘输入一个1至99999之间的数"); while(reader.hasNextInt()) { number=reader.nextInt(); if(number>=1&&number<=99999) { d5=number%100000/10000; d4=number%10000/1000; d3=number%1000/100; d2=number%100/10; d1=number%10; if(number>=10000&&number<=99999) { System.out.printf("\n%d是5位数", number); if (d1==d5&&d2==d4) { System.out.printf("\t%d是回文数", number); } else { System.out.printf("\t%d不是回文数", number); } } else if (number>=1000&&number<=9999) { System.out.printf("\n%d是4位数",number); if (d1==d4&&d2==d3) { System.out.printf("\t%d是回文数", number); } else { System.out.printf("\t%d不是回文数",number); } } else if (number>=100&&number<=999) { System.out.printf("\n%d是3位数", number); if (d1==d3) { System.out.printf("\t%d是回文数", number); } else { System.out.printf("\t%d不是回文数", number); } } else if(d2!=0) { System.out.printf("\n%d是2位数", number); if(d1==d2) { System.out.printf("\t%d是回文数", number); } else { System.out.printf("\t%d不是回文数", number); } } else if(d1!=0) { System.out.printf("\n%d是1位数", number); System.out.printf("\t%d是回文数", number); } else { System.out.printf("\n%d不在1至99999之间", number); } System.out.printf("%n可继续输入整数, 或输入非整数结束程序%n"); } } System.out.println("你输出的数据不是整数"); } }