Core
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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