The way of Java

[ArbolOne]

Thank you, you have been most kind and no more questions regarding 
Learning Java.

I just needed another engineer to have a look and confirm what I had 
been telling my colleagues.

Again, thanks so much.

On 2024-10-27 11:26 p.m., David Holmes wrote:
>
> Please note these lists are for discussion of OpenJDK development, not 
> for getting help on using Java.
>
> Your code below seems okay so you need to check how you are setting 
> the id's in the first place as the problem may be at that end.
>
> David
>
>
> On 26/10/2024 10:27 pm, ArbolOne wrote:
>>
>> Thanks!
>>
>> I realized the mistake after I posted the question, however, my real 
>> concern is about displaying the data inside the ArrayList.
>>
>> // updated example
>>
>> public class NamesRecord{
>>     String id;
>>     ...
>>     // Setters and Getters
>>     public String getId(){ return this.id; }
>> }
>>
>> // Tres Dorritos Despues
>>     // aoe.getAllNames() returns an ArrayList<NamesRecord> object 
>> containing 13 elements
>>     // each element has a unique value
>>     var localArrayList = new ArrayList<NamesRecord>(aoe.getAllNames());
>>     for(int i = 0; i != localArrayList.size(); i++){
>> */System.err.println(localArrayList.get(i).getId() );/* // <-- keeps 
>> displaying the same value
>>
>>     }
>>
>> Where did I go wrong here?
>>
>>
>> Thanks so much in advance.
>>
>>
>> On 2024-10-26 7:43 a.m., Olexandr Rotan wrote:
>>>
>>> Hello. In both examples you redeclare variable inside loop on each 
>>> new iteration. This behaviour is shared for all c-like languages. 
>>> Each time you enter a loop body, you "redeclare" (doubt it's JLS 
>>> concept) variable and initialize it with value 1. In the end of loop 
>>> you in fact increment variable, but it has no effect since variable 
>>> is reinitialized on next loop iteration.
>>> Your best choice is to move variable intiialization right before the 
>>> loop. This way you will get the desired behaviour.
>>> PS: just a suggestion for you as newbie. Take a look at "var" 
>>> keyword. This will make your programing experience much more 
>>> pleasant imo :)
>>>
>>>
>>> On Sat, Oct 26, 2024, 13:18 ArbolOne <arbolone at gmail.com> wrote:
>>>
>>>     openjdk 17.0.13 2024-10-15
>>>     OpenJDK Runtime Environment (build 17.0.13+11-Debian-2deb12u1)
>>>     OpenJDK 64-Bit Server VM (build 17.0.13+11-Debian-2deb12u1,
>>>     mixed mode, sharing)
>>>
>>>     public class NamesRecord{
>>>         String id;
>>>         ...
>>>         // Setters and Getters
>>>         public String getId(){
>>>             return this.id <http://this.id>;
>>>         }
>>>     }
>>>
>>>     // Tres Dorritos Despues
>>>
>>>     main(){
>>>         // aoe.getAllNames() returns an ArrayList<NamesRecord>
>>>     object containing 13 elements
>>>         // each element has a unique value
>>>         var localArrayList = new
>>>     ArrayList<NamesRecord>(aoe.getAllNames());
>>>         // Display all id values in NamesRecord <=== Only prints one
>>>     id NamesRecord::id value 13 times
>>>         for(NamesRecord mydto : localArrayList){
>>>             Integer pos = 1;
>>>             System.out.print(pos + " ID is : ");
>>>             System.err.print(mydto.getId() );
>>>             pos++; // <== This value does not increment
>>>         }
>>>
>>>         // Second try, but same result
>>>         for(int i = 10; i != localArrayList.size(); i++){
>>>             System.out.print("\'i\' value is : ");
>>>             System.err.println(i); // <== This value does increment
>>>             Integer pos = 1;
>>>             System.out.print(pos + " ID is : ");
>>>     System.err.println(localArrayList.get(i).getId() );
>>>             pos++; // <== This value does not get incremented
>>>         }
>>>
>>>         // Third try, but the similar result
>>>         // Please note that the value of pos is never incremented <==
>>>         NamesRecord[] array = new NamesRecord[localArrayList.size()];
>>>             array = localArrayList.toArray(array);
>>>             for(NamesRecord mydto : array){
>>>                 Integer pos = 1;
>>>                 System.out.print(pos + " ID is : ");
>>>                 p.setTimer(1);
>>>                 System.err.println(mydto.getId() );
>>>                 pos++; // <== This value does not get incremented
>>>          }
>>>     }
>>>
>>>     Hello.
>>>     When looping through the ArrayList or even the Array[] to
>>>     display the content stored in NamesRecord::id only one value is
>>>     displayed; what I'd like to do is to display all the id values
>>>     stored in the ArrayList or Array[] object.
>>>     However, as documented in the snip above, Java behaviour is not
>>>     what I expected; mind you, I am fairly new in Java.
>>>     So, my question is, what am I doing wrong?
>>>     If there is something wrong, would you point it out and help me
>>>     resolve it, please.
>>>
>>>     Is it a bug that came in the recent update I got from Debian?
>>>     If so, how do I report the bug to OpenJDK?
>>>
>>>     Thanks in advance.
>>>
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