Java数组:属性大小?

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问题描述

我在堆栈溢出中找到了这个答案:

I found this answer on Stack Overflow:

示例:

int a[] = new int[5]

a.length始终返回5，这称为数组，因此length始终返回CAPACITY.但是

a.length always returns 5 which is called the capacity of an array, so length always returns the CAPACITY. but

示例:

int a[] = new int[5]
a[0] = 10

将得到a.size = 1和a.length = 5.

size()适用于集合，length适用于Java中的数组

size() works with collection, length works with arrays in java

(大小和长度方法之间的区别?，2017年9月06)

(Difference between size and length methods? , 2017-09-06)

由于该答案获得了五次投票，我认为这是正确的.但是，实际上Java中没有数组的size属性.我知道有一个ArrayLists的方法.但是，如果使用普通数组，a.size怎么等于1?我想念什么吗?

As this answer received five upvotes I thought it is correct. But there is actually no size attribute for arrays in Java. I know there's a method for ArrayLists. However, how can a.size be equal to one if normal arrays are used? Am I missing something?

推荐答案

您是正确的，答案是错误的:Java数组没有.size属性，只有.length.

You are correct and the answer is mistaken: Java arrays don't have a .size attribute, only .length.

为了给答案的作者带来疑问的好处，我怀疑他们正在尝试解释ArrayList在内部如何使用数组.

To give the answer's author the benefit of the doubt, I suspect they are trying to explain how an array gets used internally by an ArrayList.

ArrayList实际上实际上通常在元素数组旁边还有一个.size成员 :

An ArrayList does in fact typically have a .size member alongside the element array:

class ArrayList<T> implements ... {
    private T[] elements;
    private int size;
    ...
}

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Capacity