飞镖贴图增加键的值

Question

我目前正在使用Map，其中的值是整数类型，但是每次执行操作时，我都需要更新键的值。示例：如果在执行操作后Map为{“ key1”：1}，则其应为{“ key1”：2}，依此类推。这是我的代码：

 detections = []
 while True:
    maxloc = np.unravel_index(np.argmax(scmap),
                              scmap.shape)
    if scmap[maxloc] > 0.9:
        # other code ..
        detections.append(maxloc)
        scmap[maxloc] = 0
# after that, what i did is calculating the euclidean distance 
# between each pair and excluded the ones that does not meet the  
# threshold

_order是地图

Answer 1

添加return，否则地图将始终被_order[product.name] = 1;覆盖

void addToMap(Product product) {
  if (_order.containsKey(product.name)) {
    _order.update(product.name, (int) => _order[product.name]+1);
    return;
  }
  _order[product.name] = 1;
}