start from the beginning-JAVA(成员变量与局部变量的区别封装构造方法)

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一、成员变量与局部变量的区别

二、封装

1、原则

属性隐藏起来,若需要访问某个属性,提供公共方法对其访问。

2、封装的步骤

3、封装优化——this关键字

this的含义


4、封装优化——构造方法

注意事项

5、标准代码——JavaBean


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