Core Java实例-接口抽象

2009-12-25 00:23| 发布者: admin| 查看: 44| 评论: 0|原作者: 琴姬

接口的使用：

1 多态的情况下使用接口：分为编译时和运行时的状态。

2 注意对象的相同性。

3 强制转换的情况。

package com;

public interface Animal {

}

package com;

/***
*
* 鸟类
*
* @author Administrator
*
*/
public class Bird implements Animal {

public Bird() {

}

public String color;
private int age;

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getColor() {
return color;
}

public void setColor(String color) {
this.color = color;
}

}

package com;

public class SamllBird extends Bird {

}

package com;

import java.lang.reflect.InvocationTargetException;

public class Test {

public static void main(String[] args) throws ClassNotFoundException, SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {

Animal b = new Bird();
b.toString();

Bird bird = (Bird)b;
bird.setColor("red");

System.out.println(bird.getColor());

System.out.println(b==bird);

Animal sb = new SamllBird();
Bird bb = (Bird)sb;
System.out.println(sb==bb);

System.out.println(b instanceof Animal);
System.out.println(bird instanceof Animal);
System.out.println(sb instanceof Animal);

}

}

运行结果：

red
true
true
true
true
true

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Core Java实例-接口抽象

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