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深入分析java中的关键字instanceof

一、认识instanceof关键字其实instanceof就是一个操作符，语法形式很简单：A instanceof BA通常是引用变量，B通常是一个类或者是接口，表示的含义有三个：（1）A是否是B的实例，（2）A是否是B子类的实例（3ÿ...

深入分析java中的关键字void

1、void关键字到底是什么类型？java不像是php这些弱类型的语言，java语言是强类型的，意思就是说我们的方法必须要有一个确定类型的返回值，举个例子public String test(){};上面这个test方法有一个String类型的返回值，我们也可以返回int等基础类型的。不管返回什么都...

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深入分析java中的关键字super

1、概念它是一个指代变量，用于在子类中指代父类对象。2、应用范围super的三种使用情况：访问父类的方法。调用父类构造方法。访问父类中的隐藏成员变量。3、使用（1）访问父类中的方法第一步：定义father类public class Father { private String father_a; ...

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