Multi-dimensional arrays

Multi-dimensional arrays

Multi-dimensional arrays in Java are a simple extension of one-dimensional arrays, formed by just adding another subscript slot. For example if we were to rewrite the TicTacToe program in Java, we would declare the board as:

   // The grid contents
   private int[][] marks = new int[NUM_ROWS][NUM_ROWS];

The type int[][] tell us that it is a two dimensional array holding ints. The construction expression new int[NUM_ROWS][NUM_ROWS]; actually creates the array with NUM_ROWS rows and columns.

The check to see if a particular row is a win for one of the players could be written:

     for (int j = 0; j < NUM_COLS; j++) {
          if (marks[row][j] != matchMark) {
               return false;
           }
      }

Multi-dimensional arrays