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 }