一篇java中的反射

一篇java中的反射

1.Class对象

每当编写并且编译了一个新类，就会产生一个Class对象

Class类和java.lang.reflect类库一起对反射进行了支持

1.Class方法

1. object instanceof class(这个class代指类的名字，不是常说的java class类)
2. public native boolean isInstance(Object obj);//father.class.isInstance(son)
3. public native boolean isAssignableFrom(Class<?> cls); //father.class.isAssgnableFrom(son.class)

1、2、3的结果相同,保留了某个对象是这个类么,或者是这个类的派生类么(子孙)
而equals和==的结果相同,没有考虑继承,它比较的是这个对象的确切类型

2.反射中常用到的方法

class	Description
Constructor	Constructor provides information about, and access to, a single constructor for a class.
Field	A Field provides information about, and dynamic access to, a single field of a class or an interface.
Method	A Method provides information about, and access to, a single method on a class or interface.
Modifier	The Modifier class provides static methods and constants to decode class and member access modifiers.
Parameter	Information about method parameters.
Proxy	Proxy provides static methods for creating objects that act like instances of interfaces but allow for customized method invocation.