Removing vowels (with. Java)

This article looks into the “vowel removal” issue.

As I solve coding test problems, I look back on the problems I solved and look into different solution methods to learn more.

Let’s look at the problem first.

problem

In English, the five letters a, e, i, o, and u are classified into vowels.

Complete the solution function so that when the string my_string is given as a parameter, it returns a string with the vowels removed.

Restrictions

• my_string consists of lowercase letters and spaces.
• 1 ≤ length of my_string ≤ 1,000

Input/Output Example

My solution to the problem

class Solution {
     public String solution(String my_string) {
         StringBuilder answer = new StringBuilder();
         char[] arrString = my_string.toCharArray();

         for(char charString : arrString){
             if(charString != 'a' && charString != 'e' && charString != 'i' && charString != 'o' && charString != 'u'){
                 answer.append(charString);
             }
         }
         return answer.toString();
     }
}

Solution explanation

solution(String my_string): Extracts and returns characters excluding vowels from the given string my_string.

Use StringBuilder to process strings efficiently.

Convert the string to an array of characters, check for each character if it is a collection, and if not, add it to the StringBuilder.

Finally, we convert the StringBuilder to a string and return the result.

Code Advantages

• Efficient string processing: String processing is performed efficiently using StringBuilder.
• Concise implementation: Provides a concise implementation through vowel checking for each character.

Code Disadvantages

• Hard-coded vowel list: When checking vowels, ‘a’, ‘e’, ‘i’, ‘o’, and ‘u’ are hard-coded, so if the vowel changes later, the code must be modified.