The_Kingpin08
asked on
Create an array of vectors
Hi everybody,
I'm posting here because I close my previous question (https://www.experts-exchange.com/questions/21400413/Java-class-inheritance.html) too quick (the answer helped me understanding my mistake, but now I have a logic problem).
I have a class named Dictionnary with a vectors containing a list of words: "protected Vector mots;"
I created a new class in a different file name "Cruciverbist" which is declared like this: "public class Cruciverbiste extends Dictionnaire"
Now what I want to do is:
- First to declare an array that can contains 24 vectors of words.
- Then, make a constructor that receive a filename of a file containing the list of words.
- Finaly, separate the dictionnary' words depending of their length, putting them in different vectors of the vectors' array.
* There should be a vector for each length of word (2 to 25 letters by word) containing every words of this length.
Here's how I started:
public class Cruciverbist extends Dictionnary
{
// First point. How do you declare an array of vectors ? It needs to have 24 elements, but I don't know how to initialize it with these elements... I need to
declare a new vector and add empty items ?
// Constructor.
public Cruciverbist (String filename) throws IOException
{
// I'd like to create a new Dictionnary with the filename passed in parameter.
// Then I'll have to read each words of the "words" vector and add them in the different vectors of the array.
}
}
public class Dictionnary
{
protected Vector words;
// constructor
public Dictionnary(String filename) throws IOException
{
readWords(filenamer);
quickSort(words, 0, words.size() - 1);
}
[...]
I would really appreciate if anyone could help me with this one. Thanks
Frank
I'm posting here because I close my previous question (https://www.experts-exchange.com/questions/21400413/Java-class-inheritance.html) too quick (the answer helped me understanding my mistake, but now I have a logic problem).
I have a class named Dictionnary with a vectors containing a list of words: "protected Vector mots;"
I created a new class in a different file name "Cruciverbist" which is declared like this: "public class Cruciverbiste extends Dictionnaire"
Now what I want to do is:
- First to declare an array that can contains 24 vectors of words.
- Then, make a constructor that receive a filename of a file containing the list of words.
- Finaly, separate the dictionnary' words depending of their length, putting them in different vectors of the vectors' array.
* There should be a vector for each length of word (2 to 25 letters by word) containing every words of this length.
Here's how I started:
public class Cruciverbist extends Dictionnary
{
// First point. How do you declare an array of vectors ? It needs to have 24 elements, but I don't know how to initialize it with these elements... I need to
declare a new vector and add empty items ?
// Constructor.
public Cruciverbist (String filename) throws IOException
{
// I'd like to create a new Dictionnary with the filename passed in parameter.
// Then I'll have to read each words of the "words" vector and add them in the different vectors of the array.
}
}
public class Dictionnary
{
protected Vector words;
// constructor
public Dictionnary(String filename) throws IOException
{
readWords(filenamer);
quickSort(words, 0, words.size() - 1);
}
[...]
I would really appreciate if anyone could help me with this one. Thanks
Frank
ASKER CERTIFIED SOLUTION
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You may be not needing this. You can also delete the Dictionnary d = new Dictionnary (filename);
as well.
To solve your problem, you can call
super(filename);
at the beginning of your constructor of Cruciverbist class
as well.
To solve your problem, you can call
super(filename);
at the beginning of your constructor of Cruciverbist class
ASKER
I still have 2 questions:
- In my Dictionnary's class constructor, I have a method that automatically fills the vector "words" with all the words from the file. Knowing this, does I still need the
getWords function ? Because I'd like to keep the dictionnary class as it is if I can. So while creating a new Dictionnary, I thought that a new "words" would be filled
and ready to used in my new class's constructor... That would give something like this:
// Cruciverbiste constructor
public Cruciverbiste (String nom_fichier) throws IOException
{
// Initializing the vector's elements
for (int i = 0; i < 24; i++) arrWords[i] = new Vector();
Dictionnary d = new Dictionnary (filename);
// Here we consider that the vector "words" was initialized when we created a new instance of Dictionnary
for (int i =0; i< words.size(); i++)
{
String word = (String) words.elementAt(i);
arrWords[word.length()-2].
}
}
- I'm having an error in my constructor's structure, and I think it's my fault since I never pratice inheritance besides in books...
>javac Cruciverbist.java
Cruciverbist.java:20: Dictionnary(java.lang.Stri
{
^
1 error
>Exit code: 1
And here are the line numbers:
[19]public Cruciverbiste (String nom_fichier) throws IOException
[20]{
[...]
Thanks for your time, I trully appreciate.
Frank