Java反射之getInterfaces()方法

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：

[java] view plain copy print?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<Person> string02 = (Class<Person>) person.getClass().getInterfaces()[1];        System.out.println(string01);        System.out.println(string02);           }}

eagle接口：

[java] view plain copy print?package com.deciphering.spring;

public interface eagle {
public void fly();
}

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

whale接口：

[java] view plain copy print?package com.deciphering.spring;

public interface whale {
public void swim();
}

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

运行结果：