Java:添加到数组列表

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
  }...

为什么我不能将它添加到arraylist？我相信java文档说我正确地做到了这一点.

Answer 1

你可以这样做:

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

...要么...

randOccupants.add( new Treasure(this) );

两者都是等价的,因为你总是将新元素附加到数组的末尾.

请参阅http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html