最简单的Java工厂设计模式样例

//工厂方法demo
interface Fruit{
void Eat();

}
class Apple implements Fruit{
public void Eat(){
System.out.println("我在吃苹果");
}
}
class Banana implements Fruit{
public void Eat(){
System.out.println("我在吃香蕉");
}
}
class Factory{

public static Fruit getinstance(String data){

if("banana".equals(data)){
return new Banana();
}else if("apple".equals(data)){
return new Apple();
}else{
return null;
}
}

}
public class factorydemo{
public static void main(String [] args){
Fruit f=Factory.getinstance("banana");
f.Eat();
}
}

D:\code\java>javac factorydemo.java

D:\code\java>java factorydemo
我在吃香蕉