Java：代替传递“this”作为构造函数参数，以引用创建对象 [英] Java: Alternative to passing "this" as constructor argument in order to reference creating object

问题描述

我花了一会儿想到不同的解决方案，我去的时候，我读过（我还没有真正的Java经验），使用这个作为一个构造函数的参数通常不是一个好的做法。

我想做的是实例化JobGroupMod类的几个对象，对于每个JobGroupMod，我必须创建一定数量的JobMod对象，这些对象必须能够引用回来生成它们的JobGroupMod对象。

为了实现这一点，我将this传递给JobMod构造函数，但即使工作，它也不会像正确的设计。

> public class JobGroupMod implements JobGroup {

public JobGroupMod（Node n，Set< Job> clusterJobs）{
JobMod j = new JobMod（n，this）;
}
}


现在JobMod类：

  public class JobMod implements Job {
 public JobMod（Node n，JobGroup jg）{
 setJobGroup（jg）; 
} 
} 
  

我的问题是，有更好的解决方法

解决方案

您应该尝试使用静态工厂方法（有效的Java连结）。

这样，您可以避免在构造函数调用中传递 ，这是非常不值得说的。

示例代码： / p>

  public class JobGroupMod implements JobGroup {
 
 public static JobGroupMod createModeMod（Node n，Set< Job> clusterJobs ）{
 JobGroup jg = new JobGroupMod（）; 
 JobMod j = new JobMod（n，jg）; 
 return jg; 
} 
} 
  

I've spent a while thinking about different solutions that the one I went for as I've read around (I am not really experienced with Java yet) that using this for a constructor argument isn't usually a good practice.

What I am trying to do is to instantiate several objects of class JobGroupMod and for every JobGroupMod I have to create a certain number of JobMod objects that must be able to reference back the JobGroupMod objects in which they've been spawned from.

In order to accomplish that I am passing "this" to the JobMod constructor but, even if working, it didn't feel like proper designing.

public class JobGroupMod implements JobGroup {

    public JobGroupMod(Node n,Set<Job> clusterJobs){
        JobMod j=new JobMod(n,this);
    }
}

And now the JobMod class:

public class JobMod implements Job {
     public JobMod(Node n, JobGroup jg){
         setJobGroup(jg);
     }
}

My question is, is there a better way of solving this, or is my solution the suggested way?

解决方案

You should try using a static factory method (Effective Java link).

This way you avoid passing this in a constructor call, which is highly ill-advised to say the least.
example code:

public class JobGroupMod implements JobGroup {

    public static JobGroupMod createModeMod(Node n, Set<Job> clusterJobs) {
        JobGroup jg = new JobGroupMod();
        JobMod j = new JobMod(n, jg);
        return jg;
    }
}

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