Using a put() method in arrays

[mmmtacos]

Hey,
I'm pretty new to Java and am having some trouble writing a put() method for one of my programs. The basic idea of it is to have a matrix, made by a multi-dimensional array, then to create the method with three arguements, the row, the column and the object to place into this array.

To declare the array, and the two objects I have this

    int [] [] matrixArray = new int [5] [5];
 
 
    Object a = "a";
    Object b = "b";
 

Then I have a method declaration that looks like this (with x being row, y being column)

public void put(int x, int y, Object object) {
 
  =matrixArray(x, y, object); // This clearly doesn't work as it hasn't even been fully filled out, but is along the lines of what I'm thinking!
 
}
 

I understand that I would need to have something like,
matrixArray.put (1, 3, a)
to insert the object, but I am really lost at where to start with writing this method. Any help would be appreciated!

Thanks

[r035198x]

Hey,
I'm pretty new to Java and am having some trouble writing a put() method for one of my programs. The basic idea of it is to have a matrix, made by a multi-dimensional array, then to create the method with three arguements, the row, the column and the object to place into this array.

To declare the array, and the two objects I have this

    int [] [] matrixArray = new int [5] [5];
 
 
    Object a = "a";
    Object b = "b";
 

Then I have a method declaration that looks like this (with x being row, y being column)

public void put(int x, int y, Object object) {
 
  =matrixArray(x, y, object); // This clearly doesn't work as it hasn't even been fully filled out, but is along the lines of what I'm thinking!
 
}
 

I understand that I would need to have something like,
matrixArray.put (1, 3, a)
to insert the object, but I am really lost at where to start with writing this method. Any help would be appreciated!

Thanks

1.) An int[] can only store integers.
2.) To store the integer 5 an int[] called array at the second position you use

array[1] = 5;

[JosAH]

Your matrixArray object needs access to some real matrix; why not make that
matrix a member of the MatrixArray class?

public class MatrixArray {
   private Object[][] m;
   public MatrixArray(int n, int m) {
      m= new Object[n][m];
   }
   Object get(int i, int j) { return m[i][j]; }
   ...
   // your put(Object o, int i, int j) method here
}
 

This is most of the proposed class: the constructor gets the dimensions of the
matrix and builds a private matrix. I already did the get() method for you. You
do the put() method.

kind regards,

Jos

ps. Maybe the Decorator pattern article I wrote a while ago is a nice read.

[mmmtacos]

1.) An int[] can only store integers.
2.) To store the integer 5 an int[] called array at the second position you use

array[1] = 5;

Hey,
Thanks for the reply [=

I understand this, but how would I integrate the put() method into that line of code?

[r035198x]

Hey,
Thanks for the reply [=

I understand this, but how would I integrate the put() method into that line of code?

You'd need a class for it (all methods must belong to a class in Java) and that's when the class suggested by Jos above comes in.

[mmmtacos]

Ohhhh that makes alot more sense now haha
Sorry JosAH I missed your post before

So using this I can do something more like, m.put() instead, which would make alot more sense!

Thanks for your help guys. I'll have a read of the article because my next task will be using generics!