Java Program to Replace First Occurrence Vowel with ‘-‘ in a String

In this tutorial, We will learn writing java program to Replace First vowel that occurs in the input string with ‘-‘. For any input string, we have to find vowels which occurs very first in the string and print the character after replacing that vowels with ‘-‘.

For example

Case1: If the user enters the string ‘Python is fun’
The output should be ‘Pyth-n is fun’, as the character ‘o’, is first vowel occurs in the string so it is replaced by ‘-‘.

Case2: If the user enters the string ‘Engineer’
The output should be ‘-ngineer’, as the character ‘E’, is first vowel occurs in the string so it is replaced by ‘-‘.

Java Program to Replace First Occurrence of Vowels with ‘-‘ in a String

import java.util.*;

public class Main {
	public static void main(String[] args) {
		int max_count = 0;
		char max_char = Character.MIN_VALUE;
		ArrayList<Character> arr = new ArrayList<Character>(
				Arrays.asList('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'));
		System.out.println("Java program to Replace first Vowel With '-' ");
		Scanner sc = new Scanner(System.in);
		System.out.println("Please enter a String");
		String str = sc.nextLine();
		StringBuilder tempStr = new StringBuilder(str);
		for (int i = 0; i < str.length(); i++) {
			if (arr.contains(str.charAt(i))) {
				tempStr.setCharAt(i, '-');
				break;
			}
		}
		System.out.println("String after replacing first vowel");
		System.out.println(tempStr);
	}
}

Output

Java program to Replace first Vowel With '-' 
Please enter a String
Hitechpoints
String after replacing first vowel
H-techpoints

Explanation

As the input from the user is ‘Hitechpoints’, the output obtained is ‘H-techpointsl’, the for’ loop will iterate with each element of the string and checks for the vowels once it found the first vowel, it replaces the vowel with ‘-‘ and terminates the loop by storing the characters into tempStr variable which is returned as the output.