Class & method Boolean
 

Hi wonderful programmers,

I once again need help. First i need to create a class where if the input is a vowel , it returns true and if not it returns false.

i am just learning java, but also just learning classes, methods etc. I know I have to call the method (I understand the method, class, formal param and actual param.

But, I do not know where to start or begin.

From my understanding, I need to first create the method, so it can be called. Is that correct?

2nd, I will need to create the program?

I am confused at this point.

Thanks

Re: Class & method Boolean
 

You first have to create the Class file(t.e *.java)
then inside you shoud define properties, constructor and methods
after that yiuo should write the main method, in it to make an instance of a object of the class yiou just defined, and whit that object yoiu can call the methods.I hope this is what you wanted to know
Regards,

Re: Class & method Boolean
 

Hi enicad,

thanks, but now I am even more confused. Here is my code and now I have numerous errors. I know I am probably turning something very simple into something very complicated and hard.

In this code, I am creating the class..but I think I must be confusing the 2. Would you mind looking at it?

/ Program that tells if a letter is a vowel or constant
import java.util.*;
public class isVowel
{
static Scanner console = new Scanner(System.in); //creates the new object scanner

public static void main(String[] args)
{

boolean found = true;
boolean flag = false
char true;
true = vowel;
vowel = a, e, i, o, u;

System.out.println("Please Enter a Letter: ");
char = console.nextChar();
System.out.println();

{
if (vowel !found == a && e && i && o && u)
System.out.println("The character is !found" + vowel (!found a, e, i, o, u));
else if (vowel != a, e, i, o, u)
System.out.println("The character is not a !flag" + vowel (!flag a, e, i, o, u);
}
}
}

Thanks

Re: Class & method Boolean
 

I moved your code around. I think it now does what you wanted.
It actually needs some changes to be good OOP, but I wanted it to still be reconizable to you.

import java.util.*;

public class isVowel 

{

static Scanner console = new Scanner(System.in); //creates the new object scanner

        

        public static void main(String[] args)

        {

                boolean found = false;

        

                String[] vowels = {"a","e","i","o","u","A","E","I","O","U"};

                

                System.out.println("Please Enter a Letter: ");

                String input = console.next();

                System.out.println();

                

                for (String s : vowels)

                        if (input.equals(s))

                                found = true;

                

                String result = "The input character, " + input;

                if (found)

                        result += " is a vowel.";

                else

                        result += " is not a vowel!";

                

                System.out.println(result);

        } 

}

Convention says your classes should begin with a capitol letter, but IsVowel is not a great class name.
Maybe the class should be called VowelValidator, or something important sounding like that. isVowel sounds like it should be a method name in your class.
Also, you've got all your code in the main method. Your main should probably be very short. Something like:
VowelValidator vowelValidator = new VowerValidator();
Then maybe take in your input in the constructor, or another method (perhaps in a loop even), calling the method isVowel each time.

Re: Class & method Boolean
 

I think it would better to write the metod as a static one in a class, as following code shows:

import java.util.*;
public class Vowel{
private static final String[] vowels
= {"a","e","i","o","u","A","E","I","O","U"};
public static boolean isVowel(String ch){
for(String v : vowels){
if(ch.equals(v)){
return true;
}
}

//if not match return false;
return false;
}

public static void main(String[] args){
Scanner in = new Scanner(System.in);
System.out.println("Please enter a character:");
String ch = in.nextLine();
boolean isVowel = Vowel.isVowel(ch);
if(isVowel){
System.out.println(ch + " is a vowel.");
} else {
System.out.println(ch + " is NOT a vowel.");
}
}
}