如何创建2d数组方法

Question

我在创建包含2数组的方法时遇到了困难。我理解如何创建方法和创建二维数组的概念，但我正在努力将两者结合起来。我必须创建一个从32到-31的网格(见代码)，但必须使用使用JOptionPane的方法显示。主要是在创建和调用方法时，我迷失了所有的[]，{}和()。谁能告诉我(或解释)如何创建和调用2d- array方法?

非常感谢。

   import javax.swing.JOptionPane;//not beeing used yet, have to create JOptionPane
    public class Inzend2 {
      public static void main(String[] args) {
    //over here I want to call a method for printing the blastTable in 
    //JOptionPane( for example printArray).
    //Having difficulties on creating a method containing a 
    //two-dimensional array and how to call this method
    //methode for creating blastTable, a grid of 8x8, 
    //start at 32, ends -31. How to make a method with a 2d-array?
    // Am getting lost in all the [],{} and ()
    int [][] blastTable = new int [8][8];
    int lengteArray1 = blastTable.length;//is not beeing used,
    // but created for my understanding on how to get the lenght of 
    //more dimensional array
    int lengteArray2 = blastTable [0].length;
    int beginpunt = 32;
    for ( int x = 0; x < blastTable.length; x++) {
        for ( int y = 0; y < lengteArray2; y++){
                    blastTable [x][y] = beginpunt;
                    beginpunt--;
                    System.out.print(blastTable[x][y]+ " ");
        }
        System.out.print("n");
    }
}

}

Answer 1

你的代码或多或少是正确的。

不要在控制台中打印2D数组，而是将其存储在String变量中。然后您可以返回这个变量并使用它在JOptionPane中显示您的文本。

public String something() {
//over here I want to call a method for printing the blastTable in 
//JOptionPane( for example printArray).
//Having difficulties on creating a method containing a 
//two-dimensional array and how to call this method
//methode for creating blastTable, a grid of 8x8, 
int [][] blastTable = new int [8][8];
int lengteArray2 = blastTable [0].length;
int beginpunt = 32;
String a="";
for ( int x = 0; x < blastTable.length; x++) {
    for ( int y = 0; y < lengteArray2; y++){
                blastTable [x][y] = beginpunt;
                beginpunt--;
                a+=beginpunt+"  ";
    }
    a=a+"n";
}
System.out.println(a);
return a;

}

可以返回字符串a

现在从需要的地方调用这个方法，并在JOptionPane中显示字符串。

String a = something();
JOptionPane.showMessageDialog(null,a);

希望这能解决你的问题

Answer 2

private int[][] myMethodName() {
    return myDoubleIntArray;
}

Answer 3

在下面，createArray()可以返回一个int[][]，但这里它只是将其设置为一个类变量:

public class TwoDArray {
    private static int[][] board;
    public static void main(String[] args) {
        createBoard();
        // add some pieces to some arbitrary locations
        // REMEMBER, array indexes are zero based
        addToBoard(0,0); // row 1, col 1
        addToBoard(2,5); // row 3, col 6
        addToBoard(3,7); // row 4, col 8
        addToBoard(7,3); // row 8, col 4
        // remove 1 piece
        removeFromBoard(0,0);
        for(int x = 0; x < board.length; x++) {
            for(int y = 0; y < board.length; y++) {
                System.out.println("position (row/col) :: " + (x + 1) + "/" + (y + 1) + " = " + board[x][y]);
            }
        }
    }
    private static void createBoard() {
        if(board == null) {
            board = new int[8][8];
        }
    }
    /*
     * value of 0 = empty square
     * value of 1 = play piece in square
     */
    private static void addToBoard(int rowPos, int colPos) {
        board[rowPos][colPos] = 1;
    }
    private static void removeFromBoard(int rowPos, int colPos) {
        board[rowPos][colPos] = 0;
    }
}