Print Kpc

 

public class Print_KPC {
    static String[] codes = {".;", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tu", "vwx", "yz"};

    public static void main(String[] args) {
        String str = "678";
        printKPC(str, "");

    }

    private static void printKPC(String str, String ans) {
        if (str.length() == 0) {
            System.out.println(ans);
            return;
        }
        char ch = str.charAt(0);
        int num1 = ch - '0';
        String num1_code = codes[num1];

        for (int i = 0; i < num1_code.length(); i++)
            printKPC(str.substring(1), ans + num1_code.charAt(i));


    }

}