Java letter pyramid

Question

Trying to figure out how to make a pyramid that looks like this:



15 levels and screen width is 80. I can't figure out a pattern how to print it in the most useful way.

Answer 1

First of all

• To post a question in SO is MANDATORY to show WhatHaveYouTried first.
• Lack of effort will attract downvotes and closing flags to your question.

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Second, in order to achieve your goal, divide et impera, so lets get started!

1. char in java are numerical so you can take char c = 'a' and do c++ to get b
2. You have to increase size in 2 starting from 1
3. the space will be reduced inverse to number of chars.
4. you have to repeat the char n times increasing in each iteration, I've found a one-liner in this answer

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Knowing this :

public static void main(String[] args) throws Exception {
    // get the char (point 1)
    char c = 'a';
    // iterate till 15 increasing 2 (31) - point 2)
    for (int i = 1; i < 31; i +=2) {
        // print spaces (point 3) 
        // NOTE 40 = 80/2 (screen size)
        System.out.print(new String(new char[40-i/2]).replace("\0", " "));
        // print body of pyramid (point 4)
        System.out.println(new String(new char[i]).replace("\0", c +""));
        // get next letter (point 1)
        c++;
    }
}

OUTPUT

                                    a
                                   bbb
                                  ccccc
                                 ddddddd
                                eeeeeeeee
                               fffffffffff
                              ggggggggggggg
                             hhhhhhhhhhhhhhh
                            iiiiiiiiiiiiiiiii
                           jjjjjjjjjjjjjjjjjjj
                          kkkkkkkkkkkkkkkkkkkkk
                         lllllllllllllllllllllll
                        mmmmmmmmmmmmmmmmmmmmmmmmm
                       nnnnnnnnnnnnnnnnnnnnnnnnnnn
                      ooooooooooooooooooooooooooooo

Check here a working demo