public class Sorting {
   private final int N = 10;
   private final int K = 25;
   private int[] A;
   private int[] B;
   private int[] C;
   
   public Sorting() {
      A = new int[N+1]; // not using A[0]
      B = new int[N+1]; // not using B[0]
      C = new int[K];
      for (int i = 1; i < A.length; i++)
         A[i] = (int)(Math.random()*24 + 1);
   }
   
   public void printArray(int[] X, int init) {
      for (int i = init; i < X.length; i++)
         System.out.print(X[i] + "  ");
      System.out.println();
   }
   
   public void mysterySort() {
      for (int i = 0; i < C.length; i++)
         C[i] = 0;
      for (int j = 1; j < A.length; j++)
         C[A[j]] = C[A[j]] + 1;
      for (int i = 1; i < C.length; i++)
         C[i] = C[i] + C[i-1];
      for (int j = A.length -1; j > 0; j--) {
         B[C[A[j]]] = A[j];
         C[A[j]] = C[A[j]] - 1;
      }
   }
   
   public void doSort() {
      System.out.print("A (unsorted): ");
      printArray(A, 1);
      mysterySort();
      System.out.print("B (sorted): ");
      printArray(B, 1);
      System.out.print("C: ");
      printArray(C, 0);
   }
   
   public static void main(String[] args) {
      Sorting sorting = new Sorting();
      sorting.doSort();
   }
}

% javac Sorting.java
% java Sorting
A (unsorted): 18  2  13  10  23  23  9  22  15  14  
B (sorted): 2  9  10  13  14  15  18  22  23  23  
C: 0  0  0  1  1  1  1  1  1  1  2  3  3  3  4  5  6  6  6  7  7  7  7  8  10