(Coderbyte) Run Length - Solução

Using the Java language, have the function RunLength(str) take the str parameter being passed and return a compressed version of the string using the Run-length encoding algorithm. This algorithm works by taking the occurrence of each repeating character and outputting that number along with a single character of the repeating sequence. For example: "wwwggopp" would return 3w2g1o2p. The string will not contain any numbers, punctuation, or symbols.


import java.util.*;
import java.io.*;

class Function { 
  String RunLength(String str) {
    String resposta = "";
   
    int contador = 1;
    char c = str.charAt(0);
    for (int i = 1; i < str.length(); i++) {
      if (str.charAt(i) == c) {
        contador++;
      }
      else {
        resposta += contador+""+c;
        c = str.charAt(i);
        contador = 1;
      }
    }
    resposta += contador+""+c;
   
    return resposta;
   
  }
 
  public static void main (String[] args) { 
    // keep this function call here    
    Scanner  s = new Scanner(System.in);
    Function c = new Function();
    System.out.print(c.RunLength(s.nextLine()));
  }  
 
}