Java string loop pattern

Question

I'm going through some introductory exercises and I can not understand how to get java to output a string of five letters in the particular pattern shown below.

Initially I thought it followed the tribonacci sequence for number of characters per line. Without just printing the line, I can not figure out how to have java logically replicate the pattern. They seem to copy each other, but don't really follow a pattern.

So I have worked with the classic pyramid builds but they go in a linear fashion, while this doesn't. Some initial attempts have been with stating each letter as a string, than adding each one to the previous, but that only increases by one as well. — bonzo
– bonzo, Commented Sep 14, 2016 at 0:25
This would be an ideal problem to solve using recursion (have a look at "recursive functions") — Sci Prog
– Sci Prog, Commented Sep 14, 2016 at 1:04

fatmi · Accepted Answer · 2016-09-14 00:55:09Z

3

The strings are palindrome and getting its end from the last string, for example; line 2 has "ABA" string, so line 3 will copy "ABA" at its end and will insert character C in the middle, so the final string will be "ABACABA"

String LastPattern="";
        for(int i=0;i<5;i++){
            System.out.println( LastPattern + (char)(65+i) +LastPattern);
            LastPattern=LastPattern + (char)(65+i) +LastPattern;
        }

edited Sep 14, 2016 at 0:55

answered Sep 14, 2016 at 0:35

fatmi

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8 Comments

GhostCat Over a year ago

Hint. just dropping code without any explanations: doesnt make a good answer!

bonzo Over a year ago

That's fantastic, but yeah if you could have some explanation of the logic behind why/how it's done that way that would be fantastic. I'd be happy to mark it as an answer then.

fatmi Over a year ago

The strings are palindrome and copying getting its end from the last string, for example; line 2 has "ABA" string, so line 3 will copy "ABA" at its end and will insert character C in the middle, so the final string will be "ABACABA".

Scary Wombat Over a year ago

@fatmi Update your answer with this comment

fatmi Over a year ago

does this explanation help now?

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GhostCat · Accepted Answer · 2016-09-14 00:20:27Z

1

Maybe this gets you going:

Something

Something New Something

Something New Something Newer Something New Something

The pattern is there, right in front of you.

answered Sep 14, 2016 at 0:20

GhostCat

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3 Comments

bonzo Over a year ago

Yeah you're right. I'm just legitimately too new at this to be able to understand it. If this is a wasted post I'll delete it.

bonzo Over a year ago

I suppose. I just wish I could better articulate my question so that it's not a waste of space on here but I don't know enough to properly ask in this language.

ChiefTwoPencils Over a year ago

You're creating palindromes around an increasing character if you wanted to be more clear on what you're doing @bonzo.

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