Java: Replace all the vowels in a given string with a specified character

Last update on May 24 2025 12:58:59 (UTC/GMT +8 hours)

16. Replace Vowels with Character

Write a Java program to replace all vowels in a string with a specified character.

Sample Solution-1:

Java Code:

public class test { 
   public static void main(String[] args) {	   
	    String text = "LOWERED";
		System.out.println("Original string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '#'));
		text = "Java";
		System.out.println("\nOriginal string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '*'));
		text = "MID-CENTRALIZED";
		System.out.println("\nOriginal string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '^'));
		text = "C++";
		System.out.println("\nOriginal string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '@'));
        }

   public static String validate(String text, char chr) {
	   return text.replaceAll("[aeiouAEIOU]", "" + chr);
  }
}

Sample Output:

Original string: LOWERED
After replacing vowel(s) with specified Character: L#W#R#D

Original string: Java
After replacing vowel(s) with specified Character: J*v*

Original string: MID-CENTRALIZED
After replacing vowel(s) with specified Character: M^D-C^NTR^L^Z^D

Original string: C++
After replacing vowel(s) with specified Character: C++

Pictorial Presentation:

Flowchart :

Sample Solution-2:

Java Code:

public class test {
 
   public static void main(String[] args) {	   
	    String text = "LOWERED";
		System.out.println("Original string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '#'));
		text = "Java";
		System.out.println("\nOriginal string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '*'));
		text = "MID-CENTRALIZED";
		System.out.println("\nOriginal string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '^'));
		text = "C++";
		System.out.println("\nOriginal string: "+text);
		System.out.println("After replacing vowel(s) with specified Character: "+validate(text, '@'));
        }

   public static String validate(String text, char chr) {
	   return text.replaceAll( "(?i)[aeiou]", String.valueOf(chr));
  }
}

Sample Output:

Original string: LOWERED
After replacing vowel(s) with specified Character: L#W#R#D

Original string: Java
After replacing vowel(s) with specified Character: J*v*

Original string: MID-CENTRALIZED
After replacing vowel(s) with specified Character: M^D-C^NTR^L^Z^D

Original string: C++
After replacing vowel(s) with specified Character: C++

Flowchart :

For more Practice: Solve these Related Problems:

• Write a Java program to replace every vowel in a string with a specified character using regex.
• Write a Java program to iterate through a string and substitute vowels with a custom symbol.
• Write a Java program to implement a function that transforms vowels into a designated character using stream mapping.
• Write a Java program to modify a string by replacing vowels and compare the result with a manually constructed output.

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