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最新推荐文章于 2024-04-23 23:17:02 发布

weixin_30719711

最新推荐文章于 2024-04-23 23:17:02 发布

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原文链接：http://www.cnblogs.com/yokii/p/9330775.html

本文详细介绍了Java中类的定义与实例化过程，包括构造器的作用及使用方法、非静态方法的调用方式、toString方法的功能及其重写注意事项，以及封装的概念与实践应用。

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1.类的定义与实例化

　　1）构造器/构造方法/构造函数

　　　　构造器在new的时候被调用

　　　　构造器无返回值

2.属性和方法

　　1）非静态方法必须先实例化（new）之后才能调用

3.toString

　　在object类中有toString方法

　　重写toString方法时注意返回值为String类型

　　输出一个引用类型对象时会自动调用toString方法

4.封装

　　1）private权限范围：只能在当前类中使用

　　　　　　　作用：私有化，不能再其他类中直接使用

　　2）封装作用：要操作属性时只能通过方法调用，安全

　　3）约定俗成get/set方式

　　4）有时候可以在get/set方法中适当添加需要实现的逻辑

转载于:https://www.cnblogs.com/yokii/p/9330775.html

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