今天学习Spring3框架，在理解模拟实现Spring Ioc容器的时候遇到了getInterfaces()方法。getInterfaces()方法和Java的反射机制有关。它能够获得这个对象所实现的接口。

例如：

Class<?> string01 = person.getClass().getInterfaces()[0];

//获得person对象所实现的第一个接口

详细的例子如下：

Person类：

package com.deciphering.spring;

public class Person implements eagle,whale{
    private String name = "小明";
    private int id = 10001;
    public void Speak(String name){
        System.out.println("我的名字"+name+" "+ "编号"+ id);
    }
    @Override
    public void fly() {
        System.out.println("I can Fly!!!");
    }

    @Override
    public void swim() {
        System.out.println("I can swimming!!!");
    }
    public static void main(String args[]){
        Person person = new Person();
        person.Speak("小明");
        person.fly();
        person.swim();
        System.out.println("---------------");
        Class<?> string01 = person.getClass().getInterfaces()[0];
        Class<Person> string02 = (Class<Person>) person.getClass().getInterfaces()[1];
        System.out.println(string01);
        System.out.println(string02);
    }
}

package com.deciphering.spring;public class Person implements eagle,whale{    private String name = "小明";    private int id = 10001;     public void Speak(String name){        System.out.println("我的名字"+name+" "+ "编号"+ id);    }       @Override    public void fly() {        System.out.println("I can Fly!!!");         }        @Override    public void swim() {                System.out.println("I can swimming!!!");    }    public static void main(String args[]){        Person person = new Person();        person.Speak("小明");        person.fly();        person.swim();        System.out.println("---------------");        Class
      string01 = person.getClass().getInterfaces()[0];        Class
     
       string02 = (Class
      
       ) person.getClass().getInterfaces()[1];        System.out.println(string01);        System.out.println(string02);           }}
      
     

eagle接口：

package com.deciphering.spring;

public interface eagle {
    public void fly();
}

package com.deciphering.spring;public interface eagle {    public void fly();}

whale接口：

package com.deciphering.spring;

public interface whale {
    public void swim();
}

package com.deciphering.spring;public interface whale {    public void swim();}

运行结果：