Question

public class Maze
{
    public static final int ACTIVE = 0;
    public static final int EXPLORER_WIN = 1;
    public static final int MONSTER_WIN = 2;
    private Square[][] maze;
    private ArrayList<RandomOccupant> randOccupants;
    private Explorer explorer;
    private int rows;
    private int cols;

public Maze(Square[][] maze, int rows, int cols, int numTreasures, int numMonsters, String name)
{   
    int i;
    this.maze = maze;
    this.cols = cols;
    this.rows = rows;

    randOccupants = new ArrayList<RandomOccupant>();

  for (i = 0; i < numTreasures; i++) 
  {
    randOccupants.add(i) = new Treasure(this);  //COMPILE ERROR
  }...

Why can’t I add this to the arraylist? I believe the java docs says that I’m doing this correctly.

Answer 1

First, Treasure would need to either inherit from RandomOccupant or implement it (if it is an interface).

Second, if you want to add it at a particular point in the list, the syntax is

randOccupants.add(i,new Treasure(this));

Although it’s hard to see why you don’t just do

randOccupants.add(new Treasure(this));

since the items will be added in order even if you don’t specify a location.