Java array problem. Cant pass values [closed]

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Wen I have this code:

    import java.util.Scanner;
    import java.util.Arrays;
    public class Ex02 {

        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            int [] matrixSize = new int [4];
            System.out.println("Insert the values matrix (matrixA_lines,MatrixA_Rows,matrixB_lines,MatrixB_Rows");
            matrixSize = matrixFill(4);
            System.out.println(Arrays.toString(matrixSize));
        }

        public static int[] matrixFill(int sizeOne){
            int i;
            Scanner sc = new Scanner(System.in);

            int [] matrixTemp = new int [sizeOne];
            for (i = 0; i<sizeOne; i++){
                matrixTemp[i] = sc.nextInt();
            }

            return matrixTemp;
        }
    }

It all works as expected. An unidimensional array is created, filled with 1,2,3,4 and them the array is print. The problem is that i want to use an bidimentsional array. I've modified the code and it gives error. Here is the modified code:

import java.util.Scanner;
import java.util.Arrays;
public class Ex02 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int [][] matrixSize = new int [1][4];
        System.out.println("Insert the values matrix (matrixA_lines,MatrixA_Rows,matrixB_lines,MatrixB_Rows");
        matrixSize[][] = matrixFill(1,4);
        System.out.println(Arrays.deepToString(matrixSize));
    }

    public static int[][] matrixFill(int sizeOne, int sizeTwo){
        int i;
        Scanner sc = new Scanner(System.in);

        int [][] matrixTemp = new int [sizeOne][sizeTwo];
        for (i = 0; i<sizeOne; i++){
            matrixTemp[0][i] = sc.nextInt();
        }

        return matrixTemp[sizeOne][sizeTwo];
    }
}

On line 21 (matrixSize[][] = matrixFill(1,4);) the error is:

cannot find symbol
symbol:   class matrixSize
location: class Ex02.Ex02

not a statement

';' expected

And on line 34(return matrixTemp[sizeOne][sizeTwo];) the error is:

incompatible types
required: int[][]
found:    int

Can someone tell me what I'm doing wrong? Just started to learn Java.

Regards,

favolas

The return statement 'return matrixTemp[sizeOne][sizeTwo]' is returning the object found at [sizeOne][sizeTwo] and so it fails since the object found there is only a int, since you declare that the method should return something that is int[][]. 'return matrixTemp' will do fine there. — rapadura
– rapadura, Commented Sep 28, 2011 at 22:24
The first error, you should only put matrixSize = matrixFill(1,4) since you already declared what matrixSize is. — rapadura
– rapadura, Commented Sep 28, 2011 at 22:25
apart from the type issue, the expression to the return statement would throw an out of bounds error if the indexing were actually attempted. — Christoph Rackwitz
– Christoph Rackwitz, Commented Oct 10 at 17:09

corsiKa · Accepted Answer · 2011-09-28 22:22:44Z

2

Remove the [][] from matrixSize, and from your return value.

matrixSize = matrixFill(1,4);

And

return matrixTemp;

answered Sep 28, 2011 at 22:22

corsiKa

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2 Comments

corsiKa Over a year ago

Just a note... I don't have line numbers on the code you provided, but I'll bet they're 21 and 34. Just saying, those compilation errors will help you a lot. Learning to read your tools' outputs will help you be a better programmer. Forever. :)

Favolas Over a year ago

Hi there. I've stated that the errors were on those lines. Even with the compilation errors I wasn't getting it right.

Mac · Accepted Answer · 2011-09-28 22:24:38Z

0

matrixSize[][] = matrixFill(1,4);

That's not a valid place for the [][]. The first example had it right:

matrixSize = matrixFill(1,4);

answered Sep 28, 2011 at 22:24

Mac

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Mindgames · Accepted Answer · 2011-09-28 22:29:48Z

0

You added "[sizeOne][sizeTwo]" to the return statement in the new code; you do not need this because matrixTemp has already been declared as a 2d array. The way you changed it, you are sending one element within the array.

answered Sep 28, 2011 at 22:29

Mindgames

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