import java.util.Scanner;
public class VowelChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a string: ");
String input = scanner.nextLine();
if (containsVowel(input)) {
System.out.println("The string contains at least one vowel.");
} else {
System.out.println("The string does not contain any vowel.");
}
scanner.close();
}
public static boolean containsVowel(String str) {
str = str.toLowerCase(); // Convert the string to lowercase for case-insensitive comparison
for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
return true; // Return true if a vowel is found
}
}
return false; // No vowel was found in the string
}
}
(code-box)Explanation:
1. The program begins by importing the necessary class `Scanner` from the `java.util` package, which is used to read user input.
2. In the `main` method, the program prompts the user to enter a string.
3. The `containsVowel` method is defined to check whether a given string contains a vowel. It takes a string as a parameter.
4. Inside the `containsVowel` method, the input string is converted to lowercase using the `toLowerCase()` method. This is done to make the vowel comparison case-insensitive, as vowels can appear in both uppercase and lowercase forms.
5. The method then iterates through each character in the modified string using a `for` loop. For each character, it checks if it is one of the vowels 'a', 'e', 'i', 'o', or 'u'.
6. If a vowel is found, the method immediately returns `true`.
7. If the loop completes without finding any vowel, the method returns `false`.
8. Back in the `main` method, the `containsVowel` function is called with the user's input string. Depending on the return value, the program prints whether the string contains at least one vowel or not.
9. Finally, the `Scanner` is closed to release the system resources.
You can run this program, enter a string, and it will let you know if the string contains any vowels.
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