Detailed explanation of implementing simple factory pattern in Java-javaTutorial-php.cn

Detailed explanation of implementing simple factory pattern in Java

黄舟

Release： 2017-09-29 10:10:04

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This article mainly introduces the relevant information of the simple factory pattern of java design pattern, which has certain reference value. Interested friends can refer to it

Simple factory pattern: determined by a factory object Which type of instance is created.

1.Abstract class

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

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2.Concrete class

public class Man extends People{
  @Override
  public void doSth() {
    System.out.println("I&#39;m a man,I&#39;m coding.");
  }
}

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3.Concrete class

public class Girl extends People{

  @Override
  public void doSth() {
    System.out.println("I&#39;m a girl,I&#39;m eating.");
  }
}

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4.Factory

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;
    }
  }
}

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5.Test Code

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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