javabean

• 必须要有一个无参构造函数
• 属性必须私有化
• 必须有对应的get/set方法

一般用来和数据库的字段做映射;

ORM:对象关系映射

• 表------>类

• 字段---->属性

• 行记录-->对象

id	name	age	address
1	qwer	10	beijing
2	qwert	20	shanghai
3	qwerty	30	guangzhou

class People{
    private int id;
    private String name;
    private int id;
    private String address;
}

class A{
    new People(1,"qwer",10,"beijing");
    new People(2,"qwert",20,"shanghai");
    new People(3,"qwerty",30,"guangzhou");
    
}