Question

I am having some trouble returning matrix data from one method to the main class, I am using:

matrix =  setFalse(falseMatrix);

to call:

public static boolean[][] setFalse (boolean[][] matrix[][]) {

        // Changes each value of the matrix to a false boolean value

        boolean[][] falseMatrix = null;

        for (int r = 0; r < matrix.length; r++ ) {
            for (int c = 0; c < matrix[0].length; c++ ) {
                falseMatrix[r][c] = false;

            }
        }
        return falseMatrix;

    } 

I am getting the error that falseMatrix cannot be resolved to a variable, but when I make it a parameter I get a fatal error.

Answer 1

Your code is currently very confused. I suspect you want:

public static boolean[][] setFalse(boolean[][] matrix) {
    // Changes each value of the matrix to a false boolean value

    for (int r = 0; r < matrix.length; r++ ) {
        for (int c = 0; c < matrix[r].length; c++ ) {
            matrix[r][c] = false;
        }
    }
    return matrix;
}

How you then call the method is a different matter. You need to already have a variable (or some other expression) of type boolean[][]. Unfortunately you haven’t shown us any of the context of the calling code.