Replace characters in a string, without using string replace() method [closed]

Answer 1

Another alternative...

import java.util.*;

class Replace {
    public static void main (String[] args) {
        String originalString = "This car is my car";
        String replacedString = replaceMe(originalString, "car", "bike");
        System.out.println(replacedString);
    }

    public static String replaceMe(String str, String from, String to) {
        String[] arr = str.split(" ");
        for (int i = 0; i < arr.length; i++) {
            if (arr[i].equals(from)) {
                arr[i] = to;
            }
        }
        return join(arr, " ");
    }

    public static String join(String[] arr, String delim) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < arr.length; i++) {
            sb.append(arr[i]);

            if (i < arr.length - 1)
                sb.append(delim);
        }
        return sb.toString();
    }
}