虽然我很笨，但是我很努力

1：//效率低下，线程安全 public class SingleTon1 { public final static SingleTon1 singleTonDemo=new SingleTon1(); private SingleTon1(){ } public static SingleTon1 getInstance(){ return singleTonD...

public class Factory1 { public static void main(String[] args) { Fruit f=Factory.getInstance("Apple"); f.eat(); } } //抽象产品角色：它一般是具体产品继承的父类或者实现的接口。在java中由接口或者抽象类来实现 interface Fruit{ publ...