java : array input 2 dimensi

import java.util.Scanner;
class ArrayInput2D{
  public static void main (String [] roy)
  {
    int input_b,input_k,index;
    Scanner s = new Scanner (System.in);
    System.out.print("Masukkan byk baris: ");
    input_b= s.nextInt();
    System.out.print("Masukkan byk kolom: ");
    input_k= s.nextInt();
       
    String [][] z = new String [input_b][input_k];
    for (int k=0; k<input_b*input_k; k++)
    {
     System.out.print("Masukkan nilai ke                        ["+k/input_k+"]["+k%input_k+"]:");
      z[k/input_k][k%input_k]= s.next();}      
    for (int k=0; k<input_b*input_k; k++)
    {
      System.out.print(z[k/input_k][k%input_k]+"\t\t");
       if(k%input_k==input_k - 1)
        System.out.println();
    }
       
    }
}