使用面向对象思想封装操作（进阶_慕课）

1.实体类

package com.example.para_huang.imoocdemo;

/**
 * Created by Para_Huang on 12/20/2016.
 */

public class Student{
        //私有属性
        private int id;
        private String name;
        private int age;
        private String gender;
        //无参构造
        public Student(){

        }

        public Student(String name, int age, String gender) {
            this.name = name;
            this.age = age;
            this.gender = gender;
        }

    //有参构造
        public Student(int id, String name, int age, String gender) {
            super();
            this.id = id;
            this.name = name;
            this.age = age;
            this.gender = gender;
        }
        //创建的setter和getter方法
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }