package com.app;
import java.util.Date;
/*
* 工厂模式：简单工厂、工厂方法、抽象工厂
*
* */
public class Test0718_Factory {
public static void main(String[] args) {
Fruit.FruitJudge(new Date());
Fruit.FruitJudge(5);
Fruit.FruitJudge(new Fruit());
Fruit.FruitJudge(new Cherry());
Fruit.FruitJudge(new Apple());
System.out.println();
Fruit fruit1 = Fruit.getFruit(1);
Fruit fruit2 = Fruit.getFruit(2);
fruit1.grow();
fruit2.grow();
((Apple)fruit2).m1();
}
}
class Fruit {
public void grow(){
System.out.println("水果在生长");
}
public static void FruitJudge(Object obj){
if(! (obj instanceof Fruit)){
System.out.println("参数类型不兼容");
} else {
if(obj instanceof Cherry){
Cherry f = (Cherry)obj;//造型，高->低
f.grow();
} else if(obj instanceof Apple){
Apple f = (Apple)obj;
f.grow();
f.m1();//强转后，可以明确调用子类新加的成员
} else {
Fruit f = (Fruit)obj;
f.grow();
}
}
}
//简单工厂模式，根据值的不同返回不同的子类实例
public static Fruit getFruit(int code){
Fruit obj = null;
if(code==1) {
obj = new Cherry();
} else if(code==2) {
obj = new Apple();
} else {
obj = new Fruit();
}
return obj;
}
}
class Cherry extends Fruit {
public void grow(){
System.out.println("樱桃在生长");
}
}
class Apple extends Fruit {
public void grow(){
System.out.println("苹果在生长");
}
public void m1(){
System.out.println("苹果的m1");
}
}
执行结果：
---------- 运行 ----------
参数类型不兼容
参数类型不兼容
水果在生长
樱桃在生长
苹果在生长
苹果的m1
樱桃在生长
苹果在生长
苹果的m1
输出完成 (耗时 0 秒) - 正常终止