Replace all vowels with next consonant in a given string

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Objective: Given a string, write an algorithm to replace all the vowels with next consonant, and if last alphabet is vowel, remove it.

Example:

String input: “abcdefg”
Output: “bbcdffg”

String input: “aaaabccceee”
Output: “bbbbbccc”

String input: “aaa”
Output: “”

Approach:

  • Traverse the string right to left one character at a time.
  • Maintain a variable , last_visited_non_vowel
  • During traversal , when vowel is encountered, replace it with , last_visited_non_vowel and add to result.
  • During traversal , when consonant(non vowel) is encountered, update the last_visited_non_vowel and add to result.

Code:

public class ReplaceVowels {
public String replaceVowels(String input){
String result = "";
char last_visited_non_vowel = '\0';
for (int i = input.length()–1; i>=0 ; i—) {
char x = input.charAt(i);
if(isVowel(x)){
if(last_visited_non_vowel!='\0') {
result = String.valueOf(last_visited_non_vowel) + result;
}
}else{
last_visited_non_vowel = x;
result = String.valueOf(x) + result;
}
}
return result;
}
public boolean isVowel(char x){
if(x=='a'||x=='e'||x=='i'||x=='o'||x=='u'
||x=='A'||x=='E'||x=='I'||x=='O'||x=='U')
return true;
else
return false;
}
public static void main(String[] args) {
ReplaceVowels r = new ReplaceVowels();
String input = "abcdefg";
System.out.println("Input: " + input + ", Output: " + r.replaceVowels(input));
input = "aaaabccceee";
System.out.println("Input: " + input + ", Output: " + r.replaceVowels(input));
input = "aaaa";
System.out.println("Input: " + input + ", Output: " + r.replaceVowels(input));
}
}

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ReplaceVowels.java
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Output:

Input: abcdefg, Output: bbcdffg
Input: aaaabccceee, Output: bbbbbccc
Input: aaaa, Output:

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