浅析总结 Java 内部类的一些使用与梳理

来源：互联网发布：软件测试的出路编辑：程序博客网时间：2024/06/11 06:15

序

有这篇文章，纯属巧合；那天在使用中突然发现 Java 内部类中还分 static ，说实话平时都在用，但是就是没有注意到；感觉有必要总结一下。

有必要说一下的是本文纯属浅析，如有补充还请在评论中指出，欢迎总结。

内部类的位置

[java] view plaincopy
public class A {  
    class B {  
  
    }  
  
    public void pint() {  
        class C {  
        }  
        new C();  
    }  
  
    public void pint(boolean b) {  
        if (b) {  
            class D {  
            }  
            new D();  
        }  
    }  
}  

从代码中可以看出，内部类可以定义到很多地方，常用的是成员变量中（B），方法中也叫局部内部类（C），作用域中（D）

从上面来看似乎没有用到过在方法中和作用域中的情况啊，这就错了；再来看看这个：

[java] view plaincopy
public interface AInterface {  
    void show();  
}  
public class B {  
  
    public void show() {  
        class Man implements AInterface {  
            @Override  
            public void show() {  
  
            }  
  
        }  
        Man man = new Man();  
        man.show();  
    }  
  
}  

其中我们定义了两个文件，一个文件是一个接口类，一个是B文件；在B类中，的 show()方法中我们使用了局部内部类的方式创建了类 Man ，Man class继承接口并实现方法，随后使用该类。

内部类的权限

为什么要有内部类的存在？

在我看来类主要的就是封装、继承、多态；当然其中的回调思想我认为是很重要的；而内部类的出现就是为了简化多重继承的问题；一个A类，并不能继承多个其他类，但是在使用中又需要使用到其他类的方法，这个时候内部类就发挥作用了；典型的就是事件点击的回调实现。

那么内部类的权限究竟有多大？

至于答案是什么，代码上看看就知道了。

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