//异常处理
 import java.util.Scanner;
 public class test65 {
     public static void main(String[] args){
         int a,b,c;
         Scanner in=new Scanner(System.in);
         try {
             System.out.println("亲输入a的值");
             a=in.nextInt();
             System.out.println("请输入b的值");
             b=in.nextInt();
             c=a%b;
             System.out.println("余数为"+c);
         }catch (Exception e){
             System.out.println("输入有误");
         }
     }
 }

运行结果