Your class should looks lik:
/**
FileName: VowelsAndConsonants.java
The VowelsAndConsonants class accepts a String object as its argument.
The class should have a method that returns the number of vowels in the string,
and another method that returns the number of consonants in the string.
*/
public class VowelsAndConsonants {
private String string;
int vowels = 0;
int con = 0;
/**
Constructor
@param in The input to analyze.
*/
public VowelsAndConsonants(String str) {
this.string = str;
this.parsse();
}
private void parsse() {
int a = string.length();
for (int i = 0; i < a; i++) {
if (this.isVowel(string.charAt(i))) {
vowels++;
}else{
if (this.isConsonant(string.charAt(i))) {
con++;
}
}
}
}
/**
The getVowels method returns the
number of vowels in the string.
@return The number of vowels in the string.
*/
public int getVowels() {
return vowels;
}
private boolean isVowel(char c) {
return (c == 'a' || c == 'e'
|| c == 'i' || c == 'o'
|| c == 'u');
}
private boolean isConsonant(char c) {
return (((c >= 'a' && c <= 'z') || (c >= 'A' && c >= 'Z')) && !isVowel(c));
}
/**
The getConsonants method returns the
number of consonants in the string.
@return The number of consonants in the string.
*/
public int getConsonants() {
return con;
}
}
and the client teste:
import java.util.Scanner;
public class VowelsAndConsonantsDemo {
/**
The printMenu methods displays a menu to the user
*/
public static void printMenu() {
System.out.println("Please select an option: ");
System.out.println();
System.out.print("a. Count the number of vowels in the string.\n"
+ "b. Count the number of consonants in the string.\n"
+ "c. Count both the vowels and consonants in the string.\n"
+ "d. Enter another string.\n"
+ "e. Exit the program\n");
}
public static void main(String[] args) {
String input; // to hold the user's input
String option; // to hold the user's input
char choice; // to hold a single character
char exit; // user chooses 'e' to exit the program
char letter; //the Y or N from the user's decision to exit
// create a Scanner object to read keyboard input.
// Scanner keyboard = new Scanner(System.in);
Scanner keyboard;
do {
keyboard = new Scanner(System.in);
// ask user to enter string
System.out.print("Enter a string: ");
input = keyboard.nextLine();
input = input.toLowerCase();
System.out.println();
printMenu();
option = keyboard.nextLine();
choice = option.charAt(0);
VowelsAndConsonants words = new VowelsAndConsonants(input);
switch (choice) {
case 'a':
case 'A':
System.out.println("Number of Vowels: " + words.getVowels());
break;
case 'b':
case 'B':
System.out.println("Number of Consonants: " + words.getConsonants());
break;
case 'c':
case 'C':
System.out.println("Number of Vowels & Consonants: " + words.getConsonants()
+ words.getVowels());
break;
case 'd':
case 'D':
System.out.println("Enter a string: ");
break;
case 'e':
case 'E':
System.exit(0);
break;
default:
System.out.println("You did not enter a valid choice.");
}
//
// keyboard.nextLine(); //consumes the new line character after the choice
// String answer = keyboard.nextLine();
// letter = answer.charAt(0);
} while (true);
}
}
Hope it helps.
