java--面向对象之多态1

布满荆棘的人生 2022-06-03 01:15 95阅读 0赞

**Animal：**

package Aninal;

public class Animal \{  
public String name;  
  
  
public Animal(String name) \{  
this.name = name;  
\}

**Cat：**

package Aninal;  
  
  
public class Cat extends Animal\{  
public String eyecolor;  
  
  
public Cat(String name, String eyecolor) \{  
super(name);  
this.eyecolor = eyecolor;  
\}  
  
  
@Override  
public String toString() \{  
return "我是一只猫"+this.name+"是我的名字，我的眼睛的颜色是"+this.eyecolor;  
\}  
  
\}

**Dog：**

package Aninal;  
  
  
public class Dog extends Animal\{  
public String furcolor;  
  
  
public Dog(String name, String furcolor) \{  
super(name);  
this.furcolor = furcolor;  
\}  
  
  
@Override  
public String toString() \{  
return "我是一只狗，"+this.name+"是我的名字，我的毛色是"+this.furcolor;  
\}  
  
\}

**test：**

package Aninal;  
  
  
import org.junit.Test;  
  
  
  
  
public class Jtest \{  
@Test  
public void test()\{  
Animal a=new Animal("woshidongwu");  
Dog d=new Dog("金毛","yellow");  
Cat c=new Cat("咖啡猫","咖啡色");  
System.out.println(a instanceof Animal);  
System.out.println(c instanceof Animal);  
System.out.println(d instanceof Animal);  
System.out.println(a instanceof Dog);  
\}  
@Test  
public void test1()\{  
Animal a=new Dog("金毛","yellow");  
System.out.println(a.name);  
System.out.println(a instanceof Animal);  
  
Dog d=(Dog) a;  
System.out.println(d.furcolor);  
\}  
@Test  
public void test2()\{  
Animal a=new Animal("我是动物");  
Dog d=new Dog("金毛", "yellow");  
Cat c=new Cat("萨摩耶", "white");  
match(a);  
match(d);  
match(c);  
  
\}  
private void match(Animal animal)\{  
System.out.println("名称:"+animal.name);  
if(animal instanceof Cat)\{  
Cat cat=(Cat) animal;  
System.out.println("眼睛颜色："+cat.eyecolor);  
\}else if(animal instanceof Dog)\{  
Dog dog=(Dog) animal;  
System.out.println("毛发颜色："+dog.furcolor);  
\}  
\}  
\}