简单工厂模式：由一个工厂对象决定创建出哪一种类的实例。

1.抽象类

public abstract class People { public abstract void doSth();}

2.具体类

public class Man extends People{ @Override public void doSth() { System.out.println("I'm a man,I'm coding."); }}

3.具体类

public class Girl extends People{ @Override public void doSth() { System.out.println("I'm a girl,I'm eating."); }}

4.工厂

public class PeopleFactory { public static People getSpecificPeople(String type){ if("A-Man".equals(type)){ return new Man(); }else if("B-Girl".equals(type)){ return new Girl(); }else { return null; } }}

5.测试代码

public class PeopleTestDemo { public static void main(String[] args) { People man = PeopleFactory.getSpecificPeople("A-Man"); Objects.requireNonNull(man,"对象不存在."); man.doSth(); People girl = PeopleFactory.getSpecificPeople("B-Girl"); Objects.requireNonNull(girl,"对象不存在"); girl.doSth(); People foodie = PeopleFactory.getSpecificPeople("Foodie"); Objects.requireNonNull(foodie,"对象不存在"); foodie.doSth(); }}

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