No Main Method Found?

[connorlm3]

I missed class two days last week. My class did a program together and I asked the teacher what I need to do. He said contents of it could be on the test so I need to get it from another student and see how it works. I asked a student to email me it, when he did i copied and pasted it into netbeans, went to run it, and keep getting a no main method found error? The main method has a static before it, so it isnt because of that. So what is the problem?

package mat2670;

import java.util.*;

public class MagicSquare {
    // The n/sidelength value of the magicsquare 

    private static int magicNumber;
    // Array of integers holding the user's inputs   
    private static int[] inputs;
    // Double array containing the magic square 
    private static int[][] magicSquare;
    private static int count = 0;

    public static void main(int args) {
        
        magicNumber = args;
        magicSquare = new int[args][args];
        inputs = new int[(int) Math.pow(Double.valueOf(args), 2)];
    
    }

    /**
     *
     * @return the magic constant m using the formula m = n * (n^2 + 1) / 2 ex.
     * n = 3 m = 3 (3^2 +1) 2 m = 15
     */
    private static int computeMagicConstant() {
        
        return (int) (magicNumber * (Math.pow(magicNumber, 2) + 1) / 2);

    }

    /**
     *
     * @return true if the sum of rows equals magic constant
     */
    private static boolean checkRows() {
        for (int row = 0; row < magicSquare.length; row++) {
            int tempSum = 0;
            for (int col = 0; col < magicSquare.length; col++) {
                tempSum += magicSquare[row][col];
            }
            if (tempSum != computeMagicConstant()) {
                return false;
            }
        }

        return true;
    }

    /**
     *
     * @return true if the sum of columns equals magic constant
     */
    private static boolean checkColumns() {
        for (int col = 0; col < magicSquare.length; col++) {
            int tempSum = 0;
            for (int row = 0; row < magicSquare.length; row++) {
                tempSum += magicSquare[row][col];
            }
            if (tempSum != computeMagicConstant()) {
                return false;
            }
        }

        return true;
    }

    /**
     *
     * @return true if sum of diagonals equals magic constant
     */
    private boolean checkDiagonals() {

        // Check bottom left to top right
        for (int cornerRow = getMagicSquare().length - 1; cornerRow >= 0; cornerRow--) {
            int tempSum = 0;
            for (int cornerColumn = 0; cornerColumn < getMagicSquare().length; cornerColumn++) {
                tempSum += magicSquare[cornerRow][cornerColumn];
            }
            if (tempSum != computeMagicConstant()) {
                return false;
            }

        }

        // Check bottom right to top left
        for (int cornerRow = getMagicSquare().length - 1; cornerRow >= 0; cornerRow--) {
            int tempSum = 0;
            for (int cornerColumn = getMagicSquare().length - 1; cornerColumn >= 0; cornerColumn--) {
                tempSum += magicSquare[cornerRow][cornerColumn];
            }
            if (tempSum != computeMagicConstant()) {
                return false;
            }
        }

        return true;
    }

    /**
     * Checks if userinput is the full range of numbers from n to n^2 Checks if
     * number of inputs equals n^2
     *
     * @return
     */
    public static boolean checkInput() {
        // Convert the array to a Set of integers. Duplicates will be eliminated   
        Set<Integer> setMagicSquare = new HashSet<Integer>();
        for (int i = 0; i < inputs.length; i++) {
            setMagicSquare.add(inputs[i]);
        }

        // Check if the number of values equals n^2
        if (setMagicSquare.size() != Math.pow(magicNumber, 2)) {
            return false;
        }


        // Check if all values from 1 to n^2 is present
        for (int i = 1; i <= Math.pow(magicNumber, 2); i++) {
            if (!setMagicSquare.contains(i)) {
                return false;
            }
        }
        return true;
    }

    /**
     *
     * @param i a value typed in by the user
     */
    public static void addInt(int i) {
        inputs[count] = i;
        count++;
    }

    /**
     *
     * @return true if the numbers form a magicsquare
     */
    public boolean isMagic() {
        fillMagicSquare();

        return checkInput() && checkRows()
                && checkColumns()
                && checkDiagonals();
    }

    /**
     *
     * @return an instance of the magicsquare
     */
    public int[][] getMagicSquare() {
        return this.magicSquare;

    }

    /**
     * Creates a magicsquare array
     */
    private static void fillMagicSquare() {
        int counter = 0;
        for (int row = 0; row < magicNumber; row++) {
            for (int col = 0; col < magicNumber; col++) {
                magicSquare[row][col] = inputs[counter];
                counter++;
            }
        }

    }
}

[Norm]

Please post the full text of the error message. It has important information.

[jim829]

Your signature for the main method is wrong. It must be

public static void main(String [] args) {
...
...

}

Any numeric values passed to main must be converted to numeric types.

Jim

[connorlm3]

Ooh ok, can i change args into an int with Integer.ParseInt?

[jim829]

Yes.

Jim