A method that removes a specific substring from a string

Question

I have this method that removes a specific letter from the string

public static String removeSpecificLetter(String s, String letter){
    s.replaceAll(letter, "");
    return s;
}

and when I try to print it using the code below it returns "aabbcc"

public static void main(String[] args) {
    String s1 = "aabbcc";
    System.out.println(removeSpecificLetter(s1, "a"));
}

Carefully read the Javadoc for `replaceAll()`, remembering that Strings are _immutable_ in Java. — Jim Garrison, Nov 24 '17 at 18:41

score 3 · Answer 1 · answered Nov 24 '17 at 18:42

Strings are immutable in java, which means that:

s.replaceAll(letter, "");

doesn't replace the original value of s, but returns a new string with the replaced values. Hence return s; will return the same original String. You can do this:

public static String removeSpecificLetter(String s, String letter){
    return s.replaceAll(letter, "");
}

This time we return directly the newer String version with the values already replaced.

A method that removes a specific substring from a string

1 Answers1