Path: csiph.com!aioe.org!.POSTED!not-for-mail
From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
Newsgroups: comp.lang.java.programmer
Subject: Re: How to assign an object to another in it method?
Date: Mon, 3 Jul 2017 08:38:45 -0400
Organization: Aioe.org NNTP Server
Lines: 56
Message-ID: <ojddsm$8df$1@gioia.aioe.org>
References: <oi5q4t$1okn$1@gioia.aioe.org> <factory-20170619011810@ram.dialup.fu-berlin.de> <oi8mfs$ies$1@dont-email.me> <b0821ba8-d4ab-49e9-980f-3d2c772bfd9f@googlegroups.com> <bdd41c94-f8b7-4c7d-869f-5375e68da69e@googlegroups.com> <slrnol7802.o2q.avl@logic.at> <46334961-cc18-491f-828c-32e7401c7832@googlegroups.com> <ojc6ac$i54$1@gioia.aioe.org> <ojd820$gl5$1@dont-email.me>
NNTP-Posting-Host: PBuS014lhzVyHjLbXmo/ZQ.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1
Content-Language: en-US
X-Notice: Filtered by postfilter v. 0.8.2
Xref: csiph.com comp.lang.java.programmer:36794

On 7/3/2017 6:59 AM, Martin Gregorie wrote:
> In practise, I often find myself doing something like this:
> 
> public class Demo
> {
>     private String  name;
>     private int     number;
>     private boolean prisoner;
> 
>     public Demo(String name, int answer, boolean prisoner)
>     {
>        this.name = name;
>        this.number = number;
>        this.isPrisoner = prisoner;
>     }
> 
>     public Demo(String name)
>     {
>        super(name, 6, true);
>     }
> }
> 
> ... and so on.
> 
> IOW there's one constructor that can set all attributes that might be set
> externally and a number of others that accept fewer arguments and set
> appropriate defaults for the other attributes.

Yes.

That is what I consider the missing default parameter issue.

In some languages:

      public Demo(String name, int answer, boolean prisoner)
      {
         this.name = name;
         this.number = number;
         this.isPrisoner = prisoner;
      }
      public Demo(String name)
      {
         super(name, 6, true);
      }

can be made as:

      // **** NOT JAVA ****
      public Demo(String name, int answer = 6, boolean prisoner = false)
      {
         this.name = name;
         this.number = number;
         this.isPrisoner = prisoner;
      }

Arne