2-封装性

 1 package com.example;
 2 
 3 /**
 4  * Created by Y on 16/4/13.
 5  */
 6 public class Person {
 7     private int age;
 8     private String name;
 9     public int getAge() {
10         return age;
11     }
12 
13     public void setAge(int age) {
14         if (age>=0 && age<=150) {
15             this.age = age;
16         }
17     }
18 
19     public String getName() {
20         return name;
21     }
22 
23     public void setName(String name) {
24         this.name = name;
25     }
26     public void tell(){
27         System.out.println("年龄是：" + getAge() + "姓名是：" + getName());
28     }
29 
30 }

Person

 1 package com.example;
 2 
 3 
 4 public class MyClass {
 5     public static void  main(String[] args){
 6     //封装性：保护某些属性和方法不被外部所看见.为属性和方法进行封装是通过关键字PRIVATE声明的.实现该属性的SET和GET方法为外部所访问
 7         Person per = new Person();
 8         per.setName("xiaoyu");
 9         per.setAge(20);
10         per.tell();
11     }
12 }

MyClass