The way of Java

[Olexandr Rotan]

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;
>     }
> }
>
> // 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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