java - printing rhombus numbers using a single loop? -


i talking printing pattern

       1       121      12321     1234321    123454321   12345654321  1234567654321 123456787654321

it easy using more single loop. trying implement using single loop not able so. possible?

my code:-       stringbuilder sb = new stringbuilder();     (int = 1; <= 8; ++i) {     system.out.println(sb.append(i)     + new stringbuilder(sb).reverse().substring(1));

but see how possible see being used out predefined functions reverse() etc available use loop inside them. simple single "for" loop.

here way write out pattern using 1 loop:

class rhombusnumbers{      public static void main(string[] args){         string left = "";         int max = 8;         for(int = 1; <= max; i++){             system.out.println(left + + new stringbuilder(left).reverse().tostring());             left+=i;         }     }  }

it keeps track of left digits , adds new digit on every time.

edit:

without stringbuilder since stringbuilder.reverse() uses loop , reverse 10:

class rhombusnumbers{      public static void main(string[] args){         string left = "";         string right = "";         int max = 8;         for(int = 1; <= max; i++){             system.out.println(left + + right);             left+=i;             right = + right;         }     }  }

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