Detailed explanation of implementing simple factory pattern in Java

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();
}

2.Concrete class

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

3.Concrete class

public class Girl extends People{

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

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;
    }
  }
}

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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