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    1. package com.atguigu.exercise;
    2. public class PersonTest {
    3.     public static void main(String[] args) {
    4.   Person b = new Person();
    6. //  b.getAge();
    7.   b.setAge(12);
    8.     }
    9. }
    10. class Person{
    11.     private int age;
    13.     public void setAge(int a){
    14.   if(a<0 || a>130){
    15.       System.out.println("输入的数据非法");
    16.   }else{
    17.       age = a;
    18.   }
    19.   System.out.println("年龄为："+ age);
    20.     }
    22.     public int getAge(){
    23.   return age;
    24.     }