java网格世界为列数分配变量

Question

我很难为网格上的列数指定一个变量。我在实例化cols变量时收到一个错误。有人能帮我吗

public void act()
    {

        Location place = getLocation();
        Grid<Actor> gr = getGrid();
        int cols = gr.getNumCols;
        if (place.getCol() + 1 < cols)
                moveTo(new Location(place.getRow(), place.getCol() + 1));
        else
                moveTo(new Location(place.getRow(), 0));

这是我收到的错误消息

F:\Lab III Car and Teleporter\Car Project\Car.java:54: error: cannot find symbol
        int cols = gr.getNumCols;
                     ^
  symbol:   variable getNumCols
  location: variable gr of type Grid<Actor>
1 error

Process completed.

Answer 1

int cols = gr.getNumCols;

你错过了这里的偏执

这一行应该是（假设实际上有一个方法getNumCols()）：

int cols = gr.getNumCols();