Java中的动态多态和静态多态有什么区别? [英] What is the difference between dynamic and static polymorphism in Java?

问题描述

谁能提供一个简单的例子来解释Java中动态和静态多态的区别?

Can anyone provide a simple example that explains the difference between Dynamic and Static polymorphism in Java?

推荐答案

多态

1.静态绑定/编译时绑定/早期绑定/方法重载.(在同一类中)

2.动态绑定/运行时绑定/后期绑定/方法覆盖.(在不同的类中)

class Calculation {  
  void sum(int a,int b){System.out.println(a+b);}  
  void sum(int a,int b,int c){System.out.println(a+b+c);}  

  public static void main(String args[]) {  
    Calculation obj=new Calculation();  
    obj.sum(10,10,10);  // 30
    obj.sum(20,20);     //40 
  }  
}  

覆盖示例:

class Animal {    
   public void move(){
      System.out.println("Animals can move");
   }
}

class Dog extends Animal {

   public void move() {
      System.out.println("Dogs can walk and run");
   }
}

public class TestDog {

   public static void main(String args[]) {
      Animal a = new Animal(); // Animal reference and object
      Animal b = new Dog(); // Animal reference but Dog object

      a.move();//output: Animals can move

      b.move();//output:Dogs can walk and run
   }
}

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