Java，将ArrayList转换为数组（toArray）不能强制转换？ [复制]

Question

有仓库：

public class Depot
{
    private final int x, y;

    public Depot(int x, int y)
    {
        this.x = x;
        this.y = y;
    }
}

我正在列出它：

ArrayList<Depot> depots = new ArrayList<>();
depots.add(new Depot(1, 2));
depots.add(new Depot(5, 7));

它们必须传递给另一个方法：

Object[] d2 = depots.toArray();
op((Depot[]) d2); ****

public void op(Depot[] depots)

但是****行触发异常：

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Depot;

Answer 1

尝试下面获取与List相同类型的数组

    List<Depot> depts = new ArrayList<Depot>();
    depts.add(new Depot(1, 2));
    depts.add(new Depot(1, 2));
    depts.add(new Depot(1, 2));
    Depot[] depots = depts.toArray(new Depot[depts.size()]);