create matrix of Java linked list

Hi, I'm trying to bulid a 2D matrix, when each element in the matrix is Java Linked-list. I'm getting to following error: "Index exceeds Java array dimensions"

my code is:

n=5;

a = javaArray('java.util.LinkedList', n, n);

for i=1:n

    for j=1:n

        a(i,j)=java.util.LinkedList;

        li(i,j)=a(i,j).listIterator;

            for k=1:i*j*n

                t=[i,j,i*j];

                li(i,j).add(t);

            end

    end

end

how can i solve the problem??

Answer 1

[Saurabh]

Hi @Yuval Larom,

The error "Index exceeds Java array dimensions" occurs because MATLAB's 'javaArray' function creates Java arrays that are zero-based, whereas MATLAB uses one-based indexing. This mismatch can lead to indexing errors when accessing or assigning elements.

To create a 2D matrix where each element is a Java 'LinkedList', consider using a MATLAB cell array instead. Cell arrays are more flexible and align with MATLAB's indexing conventions.

Here's how to implement it:

n = 5;
a = cell(n, n);  % Initialize a cell array
li = cell(n, n); % Initialize a cell array for iterators

for i = 1:n
    for j = 1:n
        a{i, j} = java.util.LinkedList();         % Create a LinkedList
        li{i, j} = a{i, j}.listIterator();        % Create a list iterator
        for k = 1:(i * j * n)
            t = [i, j, i * j];                    % Example data
            li{i, j}.add(t);                      % Add data to the list
        end
    end
end

For more information on 'javaArray', refer to the following MathWorks official documentation:

https://www.mathworks.com/help/matlab/ref/javaarray.html

This approach avoids indexing issues and integrates Java objects seamlessly within MATLAB's environment.

I hope this helps.