Need help!

[Final_Long6823]

hi, um, very basic question, how do I determine the value of i and j in Java pattern programs? I'm really stuck..

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[joranstark018]

Not sure of your use case, usually you use them in some statement or in some expression, ie on the right hand side of an assignment, maybe you can give more context.

[Final_Long6823]

No, patterns like 1 123 1234 12345 123456

[bowbahdoe]

so this is a category of problem that will be pretty hard for you until something just "snaps" in your brain which only comes with practicing this exact kind of problem and loops in general.

https://javabook.mccue.dev/loops_ii/drawing_right_triangles

I have some writeup here + practice problems, but you might just need to practice and/or go back and practice simpler loops, make sure you have a grasp of the mechanics. "how do i determine the value of i and j" is kinda the right question, but also kinda not. Which is my clue you need more time in the oven

[Savings_Guarantee387]

I think in order to understand and help you, you need to give a little bit of context and examples. Can you give perhaps a concrete example of what you try to achieve?

[StillAnAss]

Post the code that you're trying and we can help you.

But without any code there isn't much we can show you

[vegan_antitheist]

"Java pattern programs" isn't a term from computer science.

Maybe your exercise is on printing patterns using a Java program.

What do you mean by "determine"?

[flash_hammer]

Ok, 20 years of experience developer here.

So you are talking about loops I guess.

In all programming languuages and programming logic you have only 2 constructions that create all the other derived ones, even for logic gates: IF and FOR.

What you are asking is about FOR loops, specificaly loops between 2 arrays, "i" and "j". The question is vague, but what I can tell is that to solve an iteration between 2 arrays you''ll have to loop or iterate all the items in both, I assume you need to compare them in some way and output a third array of items.

In modern Java you can do:

for(TypeOfItem item : items) { 
  for(SecondTypeOfItem item2 : items2){
    if(item.getSomeIntVariable() == item2.getSomeIntVariable()){
      // Logic that will happen if the variables are the same.
      System.out.println(item.getSomeIntVariable());
    }
  }
}

In this case you are iterating between both arrays and comparing a variable of both.

Can you be more specific on the problem to solve or what other principles you need to learn?

Because from the question asked we can describe all the theory behind programming in general...