Java

public class Main {
  static String []_keys= {"abc", "def", "ghi", "jkl","mno","pqrs","tuv","wxyz"};
  static char [] _out;
  public Main() {
   
  }
  
  static private void comb(int [] iKeys, int iIndex)
  {
    int i;
    int iKey = iKeys[iIndex]-1;
    for (i=0; i<_keys[iKey].length(); i++)
    {
      _out[iIndex] = _keys[iKey].charAt(i);
      if ( iIndex == iKeys.length-1)
      {
        System.out.println(_out);
      }
      else
      {
        comb(iKeys, iIndex+1);
      }
    }
  }

  public static void main(String[] args) {
    _out = new char[100];
    int [] iKeys = {1,2,3};// input, i.e. keys "123" in this example
    comb(iKeys, 0);
  } 
}

public static void StringToArray(String sKeys, int [] iKeys)
{
  int i;
  for (i=0; i<sKeys.length(); i++)
  {
    iKeys[i] = (int)(sKeys.charAt(i)-'0');
  }
}
public static void main(String[] args) {
  int [] iKeys;
  String s = "123";
  iKeys = new int[s.length()];
  StringToArray(s, iKeys);
  _out = new char[100];
  comb(iKeys, 0);
}

harshad bhatia wrote:

the method comb is required to have the parameter passed as a String not integer of arays

Hohepa Hori wrote:

Trying too write a java program on towers of hanoi
It supposed to written in stack class.
There is a Peg class and Board class.

I have no where to begin with this