[英]Finding length of GenericArrayList parameter in Java
As part of a homework assignement I am adding methods to a class for GenericArrayLists. 作为作业分配的一部分,我将方法添加到GenericArrayLists的类中。
Specifically I need to check the length of an ArrayList that is passed through my method. 具体来说,我需要检查通过我的方法传递的ArrayList的长度。 When I tried arrayINeedToCheck.length, it gives me an error because I have not defined that variable (arrayINeedToCheck).
当我尝试arrayINeedToCheck.length时,它给了我一个错误,因为我没有定义该变量(arrayINeedToCheck)。
I don't know where I have erred but I hope you'll be able to steer me in the right direction. 我不知道我在哪里犯了错误,但希望您能够将我引向正确的方向。
Here is my code: 这是我的代码:
public void addAll(ArrayListGeneric<E> anotherList)
{
int s = (data.length - size);
if (anotherList.length > s) {
E[] newData = (E[])(new Object[data.length+anotherList.length]);
for (i = 0; i < size; i++)
newData[i] = data[i];
data = newData;
}
The anotherList.length is the problem. anotherList.length是问题所在。 It says I haven't defined that variable.
它说我还没有定义那个变量。 It's a parameter so I didn't think I'd need to define it again.
这是一个参数,因此我认为不需要再次定义它。 Because its length and contents are variable, I can't just create a new, empty array list.
因为它的长度和内容是可变的,所以我不能只创建一个新的空数组列表。
Help me stackoverflow, you're my only hope. 帮助我stackoverflow,您是我唯一的希望。
If ArrayListGeneric
is anything like java.util.ArrayList
, it won't have a public length
field. 如果
ArrayListGeneric
类似于java.util.ArrayList
,它将没有公共length
字段。 Maybe you wanted .size()
. 也许你想要
.size()
。
edit: or .size
, as that one line would suggest. 编辑:或
.size
,如那一行所建议。
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