练习:12

import java.util.*;
public class P70_4{
public static void main (String[]args){
Scanner input = new Scanner(System.in);
System.out.println("请输入一个整数a:");
System.out.println("请保持:a<b<c.");
int a = input.nextInt();//从键盘录入a
System.out.println("请在输入一个整数b:");
int b = input.nextInt();//从键盘录入b
System.out.println("请再一次输入一个整数c:");
int c = input.nextInt();//从键盘录入c
if (( a < b && a < c )&& ( b < c )) {
System.out.println("恭喜,输入正确!");
System.out.println("a为:"+a+"\nb为:"+b+"\nc为:"+c);
} else {
System.out.println("对不起,输入错误!请重新输入,并保持a<b<c.");
}
}
}

对数据比较有要求,别的不需要太多逻辑.