The way of Java

[David Holmes]

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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