英文:
Exceed capacity
问题
以下是您要翻译的代码部分：
让我们假设我们有一个简单的ArrayList/Vector实现，这是在超出容量时调用的分配函数private void allocateCapacity(int capacity){// private Object [] m_elems;Object [] tmp = Arrays.copyOf(m_elems, capacity);Arrays.fill(m_elems, null); // 这个地方让我困惑，我是否应该写这一行或不写？m_elems = tmp;}
英文:
Let's say we have simple ArrayList/Vector implementation, Here is my alloc function when we exceeded capacity
private void allocateCapacity(int capacity){// private Object [] m_elems;Object [] tmp = Arrays.copyOf(m_elems, capacity);Arrays.fill(m_elems, null); // this point where I confused, Should I have to write this line or not?m_elems = tmp;}
答案1
得分: 0
Arrays.copyOf(m_elems, capacity);将会创建一个大小为 capacity 的 m_elements 副本。我将在这里引用 javadoc：> 复制指定的数组，如果需要，截断或填充为 null，以使副本具有指定的长度。这意味着如果 capacity 大于原始数组，您的数组将已经填充了 null。我可能会写成一行代码：m_elems = Arrays.copyOf(m_elems, capacity);
英文:
Arrays.copyOf(m_elems, capacity);
Will create a copy of the m_elements with size capacity. And I will reference the javadoc here:
> Copies the specified array, truncating or padding with nulls (if
> necessary) so the copy has the specified length.
Which means your array will already be padded with nulls if capacity is bigger than your original array.
I would have probably written a one liner:
m_elems = Arrays.copyOf(m_elems, capacity);
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