Using combined strings as istance name

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gordanbla..

Using combined strings as istance name

in Programming Questions • 2 years ago

Hi,

being a super noob in programming i was trying to give a class instance a name generated by a for cycle.

now, the problem is that in both the line of code i wrote (line 7 and 8) Processing doesn't read the id as i want to (i.e. q1, q2, q3).

is there a way to tell processing to use a mix of 2 or plus strings as an instance name?

Thank you.

for (int i = 1; i <= 4; i++) {
String letter = "q";
String num = str(i);
String mix = letter+num;
println(mix);
str(q+i).display(); // just read q as istance name don't consider the i
mix.display(); // of course uses the word mix as the id
}

Replies(3)

anchnk

Re: Using combined strings as istance name

2 years ago

Hi, i'm not sure i did understood what you want.
Is it what you are looking for ?

for (int i = 1; i <= 4; i++) {
String letter = "q";
String num = str(i);
String mix = letter+num;
println(letter + num);
println(letter + i); // works too, i is being converted into a string by java as it's concatenated with a string
println(mix);
}

PhiLho

Re: Using combined strings as istance name

2 years ago

Funny as this kind of question comes back regularly...
You probably want arrays instead, it is simpler and more efficient.
Or array lists, or if you really need to find an instance by a name, you can look at hash maps.
But if you explained instead what you need to do, we can give more precise advices.

gordanbla..

Re: Re: Using combined strings as istance name

2 years ago

i guess it comes back regularly because one would expect to have a way to generate sequential id's without having to create an array (wich is a bit counter intuitive for a non-programmer).

what i need to do is just creating a sequential string to use as a class id.

i'll try to figure out arrays now ;) thx

@anchnk: thank you but that's not what i ment, i can print a string combining 2 (or more) variables, but i can't use it as an id (for calling a class function).

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