public class KeypadSolution { public static void printKeypad(int input,String output) { if (input == 0) { System.out.println(output); return; } int rem = input % 10; char[] helperArray = helper(rem); printKeypad(input / 10, helperArray[0] + output); printKeypad(input / 10, helperArray[1] + output); printKeypad(input / 10, helperArray[2] + output); if (helperArray.length == 4) printKeypad(input / 10, helperArray[3] + output); } public static char[] helper(int n){ if (n == 2) return new char[]{'a', 'b', 'c'}; else if (n == 3) return new char[]{'d', 'e', 'f'}; else if (n == 4) return new char[]{'g', 'h', 'i'}; else if (n == 5) return new char[]{'j', 'k', 'l'}; else if (n == 6) return new char[]{'m', 'n', 'o'}; else if (n == 7) return new char[]{'p', 'q', 'r', 's'}; else if (n == 8) return new char[]{'t', 'u', 'v'}; else if (n == 9) return new char[]{'w', 'x', 'y', 'z'}; else return new char[]{' '}; } public static void main(String[] args){ printKeypad(97,""); } }
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