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  1. public class Main {
  2.     public static void main(String[] args) {
  3.         String s = "a3";
  4.  
  5.         char lastLetter = 0;
  6.         boolean isDigit = false;
  7.         int digit = 0;
  8.         for(int i = 0; i <= s.length(); i++) {
  9.             char c = i != s.length() ? s.charAt(i) : 0;
  10.  
  11.             if(Character.isDigit(c)) {
  12.                 isDigit = true;
  13.                 digit = digit*10 + (c-'0');
  14.                 continue;
  15.             }
  16.             if(isDigit) {
  17.                 for(int j = 0; j < digit-1; j++) {
  18.                     System.out.print(lastLetter);
  19.                 }
  20.                 isDigit = false;
  21.                 digit = 0;
  22.             }
  23.             System.out.print(lastLetter);
  24.             lastLetter = c;
  25.         }
  26.     }
  27. }
Success #stdin #stdout 0.1s 320512KB
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stdin
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Standard input is empty
stdout
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aaa
https://ideone.com/JkqzHz
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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