SRL Archive - Java Help and Tutorials

I'm trying to make a char counter for a given text file in java.

I've a pretty good idea on how to accomplish this, however I'm stuck when a requirement is to have a constructor in the class named differently from the class name?

Ex.

public class LetterCounter {        
    public LetterInventory() {
        //
    }
}

Edit: I may have read the question wrong, as I've come across several sources saying you must have the same name as the class..

If I want to use letterCounter later on, as if I wanted to call such a line as:

  LetterInventory inventory = new LetterInventory();

– > how would I go about this? I thought that I had to create a construct and store the values inside that construct?

Can I do this with methods (so I can use different names)?

What? Don't understand the question..

Simply don't call the constructor.. Objects in java are just references/pointers to a memory location. If you don't set that reference to a new instance, it does nothing and can be set later if the class is not static.

ClassName Variable = null;

//Do other stuff here...

Variable = new ClassNameConstructor(.....);

Here's the layout that may help

• LetterInventory() – constructs the inventory with a maximum of 26 different letters.
• void countOccurrences(Scanner file) – counts the frequency of each letter in a file
• void displayTable() – displays the frequencies of each letter in the inventory
• void resetInventory() – resets all of the counts to 0

The line that's given to us in main, that I bring into question is:
LetterInventory inventory = new LetterInventory();

The class is named, "LetterCounter" and I think that conflicts with line above?
Or can I create a method that delivers the same line as italicized above?

From: Le Jingle
Here's the layout that may help

• LetterInventory() – constructs the inventory with a maximum of 26 different letters.
• void countOccurrences(Scanner file) – counts the frequency of each letter in a file
• void displayTable() – displays the frequencies of each letter in the inventory
• void resetInventory() – resets all of the counts to 0

The line that's given to us in main, that I bring into question is:
LetterInventory inventory = new LetterInventory();

The class is named, "LetterCounter" and I think that conflicts with line above?
Or can I create a method that delivers the same line as italicized above?

You can create a method if you like OR if you know inheritance then:

import java.util.Scanner;

public class LetterCounter {
    public LetterCounter() {
        
    }
    
    void countOccurrences(Scanner file) {
        
    }
    
    
}

public class LetterInventory extends LetterCounter {
    
    private char Letters[] = new char[26];
    
    public LetterInventory() {
        super();
        
        for(char I = 'A', J = 0; I < 'Z'; ++I, ++J) {
            Letters[J] = I;
        }
    }
    
    public void displayTable() {
        
    }
    
    public void resetInventory() {
        
    }
}

public static void main(String[] args) {
        LetterCounter C = new LetterInventory();
}

It all depends..With the above, you can create a letterinventory through the counter class.

I'd say just stick to a method. Why is the classname different? Is it two classes? If it is then just do:

public class Counter {
    private LetterInv = new LetterInv();

    public Counter() {
    }
}

IMHO, I think you're naming your classes wrong.
I think everything you have to do should be in a class called LetterInventory with a default constructor and the other stuff is just methods. Thus there should be no need for that LetterCounter class.

EX:

import java.util.Scanner;

public class LetterInventory {
    
    private char Letters[] = new char[26];
    
    public LetterInventory() {
        super();
        
        for(char I = 'A', J = 0; I < 'Z'; ++I, ++J) {
            Letters[J] = I;
        }
    }
    
    void countOccurrences(Scanner file) {
        
    }
    
    public void displayTable() {
        
    }
    
    public void resetInventory() {
        
    } 
}

Ah yes, thanks brandon!

I didn't know about inheritance, but I've got the basic idea of it, no idea on how I'd implement or remember it :p

HOWEVER: Our teacher named our code skeleton wrong, he named the class different from the constructors -.-
(he mentions that our class, in the instructions, should be LetterInventory, as the first constructor is named)

Thanks again!

Cheers,
Lj