java设计模式之简单工厂模式详解

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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