Java: Call/Return Error

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 < ma开发者_如何转开发trix.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.

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.

change

(boolean[][] matrix[][]) {

to

(boolean[][] matrix) {

and

boolean[][] falseMatrix = null;

to

boolean[][] falseMatrix = new boolean[matrix.length][];

and insert between the two for

falseMatrix[r] = new boolean[matrix[r].length];

and finally change in 2nd for

matrix[0].length;

to

matrix[r].length;

Change:

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

To:

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

Also, initialize your array:

    //HERE
    boolean[][] falseMatrix = new boolean[matrix.length];

    for (int r = 0; r < falseMatrix.length; r++ ) {
    //AND HERE
        falseMatrix[r] = new boolean[matrix[0].length];
        for (int c = 0; c < falseMatrix[r].length; c++ ) {
            falseMatrix[r][c] = false;
        }
    }

    return falseMatrix;
} 

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

you should probably change matrix[0] to matrix[r]. Not sure if it solves your problem, but Im pretty sure thats what you want.

boolean[][] falseMatrix = null;

falseMatrix is a null reference. You have to initialize it to with rows, columns before trying to keep values at it's indices.

On the first line (the calling line) you are using two different variables, falseMatrix and matrix, since it's giving error on falseMatrix then I suppose it's the wrong one.

You need:

boolean[][] falseMatrix = new boolean[matrix.length][matrix[0].length];