类方法学习四:getGenericInterfaces,getInterfaces

一.说明

1.Type[] getGenericInterfaces

以Type的形式返回本类直接实现的接口.这样就包含了泛型参数信息

2.Class[] getInterfaces

返回本类直接实现的接口.不包含泛型参数信息

二.例子

1.接口

public interface MyInterfaceA {

  public void sayHello();

}

public interface MyInterfaceB{

  public String print();

}

public interface MyInterfaceC<A,B> {

  public A getA();

  public B getB();

}

2.Test.java

import java.lang.reflect.Type;

import java.lang.reflect.ParameterizedType;



public class Test<A,B> implements MyInterfaceC<A,B>,MyInterfaceA,MyInterfaceB{

  private A a;

  private B b;

  //MyInterfaceC

  public A getA() {

    return a;

  }

  public B getB() {

    return b;

  }

  //MyInterfaceA

  public void sayHello() {

  }

  //MyInterfaceB

  public String print() {

    return "";

  }



  public static void main(String args[]) throws Exception{

    Type[] ts = Test.class.getGenericInterfaces();



    System.out.println("======getGenericInterfaces======:");

    for (Type t:ts) {

      System.out.println(t);



      if (ParameterizedType.class.isAssignableFrom(t.getClass())) {

        System.out.print("----------->getActualTypeArguments:");

        for (Type t1:((ParameterizedType)t).getActualTypeArguments()) {

          System.out.print(t1 + ",");

        }

        System.out.println();

      }

    }



    System.out.println();

    System.out.println("======getInterfaces======:");

    for (Class c:Test.class.getInterfaces()) {

      System.out.println(c.getName());

    }

  }

}

输出结果:

======getGenericInterfaces======:

MyInterfaceC<A, B>

----------->getActualTypeArguments:A,B,

interface MyInterfaceA

interface MyInterfaceB

======getInterfaces======:

MyInterfaceC

MyInterfaceA

MyInterfaceB