Java Basic(55)-Introduction to Polymorphism

public class food {

void eat(){

System.out.println("this food is great");

}

}

public class potpie extends food{

void eat(){

System.out.println("this potpie is great");

}

}

public class tuna extends food{

void eat(){

System.out.println("this tuna is great");

}

}

class apples{

public static void main(String[] args){

food bucky[]=new food[2]; → 陣列

bucky[0]=new potpie(); → 這裡的新對象

bucky[1]=new tuna(); → 這裡的新對象

for(int x=0;x<2;++x){

bucky[x].eat();

}

}

}

由於potpie和tuna extends到food，你不需要為tuna.tunaObject（類似的東西

這是運行時的結果： 

this potpie is great

this tuna is great