java - Java HashMap覆盖先前的值

因此，我尝试遍历并将一组坐标存储在具有整数键的哈希图中。但是，哈希图似乎是将最后一对坐标映射到每个键，以便当我遍历并在末尾获得每一对时，它们都是相同的。下面的代码，任何帮助将是巨大的！谢谢！

public HashMap<Integer,int[]> tiles;

public Board()
{
    setPreferredSize(new Dimension(600, 600));
    tiles = new HashMap<Integer,int[]>();
    setTiles();
}

public void setTiles() {
        int[] coords = { 525, 525 };
        Integer square;
        for (square=1;square<=9;square++) {
            System.out.println(square+": "+coords[0]+",, "+coords[1]);
            tiles.put(square,coords);
            int[] coord = tiles.get(square);
            System.out.println(square+": "+coord[0]+"; "+coord[1]);
            coords[0] = coords[0] - 50;
        }
        tiles.put(square,coords);
        for (square=11;square<=19;square++) {
            System.out.println(square+": "+coords[0]+",, "+coords[1]);
            tiles.put(square,coords);
            int[] coord = tiles.get(square);
            System.out.println(square+": "+coord[0]+"; "+coord[1]);
            coords[1] = coords[1] - 50;
        }
        tiles.put(square,coords);
        for (square=21;square<=29;square++) {
            System.out.println(square+": "+coords[0]+",, "+coords[1]);
            tiles.put(square,coords);
            int[] coord = tiles.get(square);
            System.out.println(square+": "+coord[0]+"; "+coord[1]);
            coords[0] = coords[0] + 50;
        }
        tiles.put(square,coords);
        for (square=31;square<=39;square++) {
            System.out.println(square+": "+coords[0]+",, "+coords[1]);
            tiles.put(square,coords);
            int[] coord = tiles.get(square);
            System.out.println(square+": "+coord[0]+"; "+coord[1]);
            coords[1] = coords[1] + 50;
        }
        tiles.put(square,coords);
        for (square = 1;square<=40;square++) {
            int[] coord = tiles.get(square);
            System.out.println(square+": "+coord[0]+"/ "+coord[1]);
        }
    }

最佳答案

您正在为所有键重用同一数组实例。最好每次put数组的副本。例如：

tiles.put(square, Arrays.copyOf(coords, 2));

代替

tiles.put(square, coords);

关于java - Java HashMap覆盖先前的值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29286499/