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I have two Strings:
String a="org.test.A";
String b="org.test.B";
I get a class by Reflection
Class aClass = Class.forName(a);
I want aClass extends b, like:
Class okClass=aClass.extends(b);//how to implement this?
how to implement this?
how to get okClass?
thanks!
696
The extends keyword extends a class (indicates that a class is inherited from another class). In Java, it is possible to inherit attributes and methods from one class to another.
In order to reflect a Java class, we first need to create an object of Class . And, using the object we can call various methods to get information about methods, fields, and constructors present in a class. class Dog {...} // create object of Class // to reflect the Dog class Class a = Class. forName("Dog");
It is generally a bad idea to use reflection is application code, because you lose the strict type checking of the language. Reflection is generally for use by framework code, where it is essential. Good vs bad are not absolutes, but must be assessed in context.
Reflection is a feature in the Java programming language. It allows an executing Java program to examine or "introspect" upon itself, and manipulate internal properties of the program. For example, it's possible for a Java class to obtain the names of all its members and display them.
Apart from using a JDK dynamic proxy, which works only by interface, you can use CGLIB or javassist for extending classes at runtime.
198
Generally speaking you want to be able to create new classes (not objects) at runtime. You can use bytecode engineering or java compiler api for that.
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