【拓展】循环输入内容，直到输入内容为数字结束循环

 1 package com.kt0002;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Demo01 {
 6     static Scanner sc=new Scanner(System.in);
 7     
 8     public int getInt() {
 9         System.out.println("请输入一个数字：");
10         while(!sc.hasNextInt()) {
11             System.out.println("输入内容有误，请重新输入！");
12             sc.next();
13         }
14         int num=sc.nextInt();
15         return num;
16     }
17     
18     public static void main(String[] args) {
19         Demo01 demo=new Demo01();
20         System.out.println(demo.getInt());
21     }
22     
23         
24     
25 }