Multiple class builders, with different parameters

Asked Dec 05 '21 at 09:50

Active Dec 05 '21 at 09:55

Viewed 154 times

I have several mandatory parameters and some which aren't. So the basic builder I made is with all the parameters:

public MyObject(int field1, int field2)
    {
     this.field1 = field1;
     this.field2 = field2;
    }

But field2 is not mandatory. So I added another builder:

public MyObject(int field1)
    {
     new MyObject(field1, 0);
    }

So the problem here is the new part. However, without the new I get an error. I tried adding return, but still an error.

Basically, I don't want to write another builder, I want to use the same one as before. Simply, to call it with default values for the non-mandatory parameters. But I must add new, and then I am creating a new instance of the class, which is not what I wanted!

The reasoning behind calling the existing builder is that there are many function inside the builder, not just this.blahblah= blahblah, so I don't want to write the same code twice. How can I do this?

asked Dec 05 '21 at 09:50

TheEmeritus

1

Does this answer your question? [How do I call one constructor from another in Java?](https://stackoverflow.com/questions/285177/how-do-i-call-one-constructor-from-another-in-java) – Yousaf Dec 05 '21 at 09:56
1

You need to replace `new MyObject(field1, 0);` with `this(field1, 0);` – Yousaf Dec 05 '21 at 09:57
Yes, thanks. Feels so simple :) – TheEmeritus Dec 05 '21 at 10:00
These are constructors, not builders. The builder pattern is something different. – tgdavies Dec 05 '21 at 10:43

Multiple class builders, with different parameters

0 Answers0