Thread: java replace correct number into letter

Well, this is my first time get here.

I'm trying to figure out the correct way to replace number into letter. In this case, I need two steps.

First, convert letter to number. Second, restore number to word.

Words list: a = 1, b = 2, f = 6 and k = 11.

I have word: "baafk"

So, for first step, it must be: "211611"

Number "211611" must be converted to "baafk".

But, I failed at second step.

Code I've tried:

public class str_number {
public static void main(String[] args){
    String word = "baafk";
    String number = word.replace("a", "1").replace("b","2").replace("f","6").replace("k","11");
    System.out.println(word);
    System.out.println(number);
 
    System.out.println();
 
    String text = number.replace("11", "k").replace("6","f").replace("2","b").replace("1","a");
    System.out.println(number);
    System.out.println(text);
    }
}

Result for converting to number: baafk = 211611

But, result for converting above number to letter: 211611 = bkfk

What do I miss here?

How to distinguish if 11 is for "aa" and for "k"? Do you have any solutions or other ways for this case?

Thank you.