Replace all characters in a String with appropriate key value pair from a map using stream

I have a map of String entries.

 Map<String, String> forConversion = Map.ofEntries(
 Map.entry("$","s"),
 Map.entry("§ ","ss"),
 Map.entry("Đ ","d"),
,...);

Input String

String input= "$ab§d";
//shoud be converted to
//"sabssd"

How I can do this using java streams. Think it is possible and easy. 🙂

>Solution :

here it is

import java.util.Map;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        Map<String, String> forConversion = Map.of(
            "$", "s",
            "§", "ss",
            "Đ", "d"
            // add more mappings as needed
        );

        String input = "$ab§d";

        String output = input.chars()
            .mapToObj(c -> String.valueOf((char) c))
            .map(s -> forConversion.getOrDefault(s, s))
            .collect(Collectors.joining());

        System.out.println(output);  // prints "sabssd"
    }
}

Logic steps are simple:

1. Split string into char array and stream it
2. Convert each char into String
3. Use it as key in the map to get the appropriate value, if not exits mantain current
4. Join all result to a new String