java - 类构造函数中的 ArrayIndexOutOfBounds

Question

public class Environment {
    //variables
    RoundingStage[][] land;
    int horizontalStreets;
    int verticalStreets;

   public Environment(RoundingStage[][] grid) {
       this.horizontalStreets = grid.length;
       this.verticalStreets = grid[0].length;
       land = new RoundingStage[horizontalStreets][verticalStreets];

       for (int i = 0 ; i <= horizontalStreets ; i++)
           for (int j = 0 ; j <= verticalStreets ; j++)
               land[i][j] = grid[i][j];
    }
   public Environment(Environment env) {
        this.horizontalStreets = env.horizontalStreets;
        this.verticalStreets = env.verticalStreets;
        land = new RoundingStage[horizontalStreets][verticalStreets];

        for (int i = 0 ; i <= horizontalStreets ; i++)
            for (int j=0 ; j <= verticalStreets ; j++)
                land[i][j] = env.land[i][j];
    }

有人可以告诉我为什么当我使用这个函数时我会得到ArrayOutOfBound，我已经尝试了+1、-1的每种组合，我需要一些帮助:D

public RoundingStage valueInPosition(int rHor, int rVer) {
    return land[rHor-1][rVer-1];    
    }

Answer 1

您实际上应该在这些构造函数中获得超出范围的异常。这些嵌套循环使用 i和j因为迭代器应该循环直到 i < horizontalStreets和j <verticalStreets ，不是<=正如目前发布的那样。 Java 数组索引从 0 开始。