package com.atguigu.java5;
import java.util.Random;
//面试题:多态是编译时行为还是运行时行为?
//证明如下:**多态是在运行时**
class Animal {
protected void eat() {
System.out.println("animal eat food");
}
}
class Cat extends Animal {
protected void eat() {
System.out.println("cat eat fish");
}
}
class Dog extends Animal {
public void eat() {
System.out.println("Dog eat bone");
}
}
class Sheep extends Animal {
public void eat() {
System.out.println("Sheep eat grass");
}
}
public class InterviewTest {
public static Animal getInstance(int key) {
switch (key) {
case 0:
return new Cat ();
case 1:
return new Dog ();
default:
return new Sheep ();
}
}
public static void main(String[] args) {
int key = new Random().nextInt(3);
System.out.println(key);
Animal animal = getInstance(key);
animal.eat();
}
}
java day012 面试题:多态是在编译时还是运行时
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