Java反射之getInterfaces()方法

今天學習Spring3框架，在理解模擬實現Spring Ioc容器的時候遇到了getInterfaces()方法。getInterfaces()方法和Java的反射機制有關。它能夠獲得這個對象所實現的接口。

例如：

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

//獲得person對象所實現的第一個接口

詳細的例子如下：

Person類：

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+" "+ "編號"+ 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+" "+ "編號"+ 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：

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();

}

運行結果：