JAVA基础-多态
多态 polymophism: 动态绑定, 迟绑定, 指在执行期间(java), 而不是编译期间(javac), 判断所引用对象的实际类型, 根据实际类型调用响应的方法.
3个条件: 1. 继承 2. 重写 3. 父类引用指向子类对象
优点: 可扩展
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | abstract class Animal { private String name; Animal(String name) { this .name = name;} public void enjoy(){ System.out.println( "叫声......" ); } //public abstract void enjoy(); } //abstract <br>class Cat extends Animal { private String eyesColor; Cat(String n,String c) { super (n); eyesColor = c;} public void enjoy() { System.out.println( "猫叫声......" ); } //public abstract void enjoy(); } class Dog extends Animal { private String furColor; Dog(String n,String c) { super (n); furColor = c;} public void enjoy() { System.out.println( "狗叫声......" ); } } class Bird extends Animal { Bird() { super ( "bird" ); } public void enjoy() { System.out.println( "鸟叫声......" ); } } class Lady { private String name; private Animal pet; Lady(String name,Animal pet) { this .name = name; this .pet = pet; } public void myPetEnjoy(){pet.enjoy();} } public class Test { public static void main(String args[]){ Cat c = new Cat( "catname" , "blue" ); Dog d = new Dog( "dogname" , "black" ); Bird b = new Bird(); Lady l1 = new Lady( "l1" ,c); Lady l2 = new Lady( "l2" ,d); Lady l3 = new Lady( "l3" ,b); l1.myPetEnjoy(); l2.myPetEnjoy(); l3.myPetEnjoy(); } } |
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