Java的数组

我们知道，在Java中，数组也是一种对象，所以，数组应该也存储在堆区中。

既然数组是一种对象，那么它也应该有相应的方法和属性，通过IDE的帮助，我们可以得到以下方法：

根据猜测，数组应该直接继承Object类，并且复写了clone方法（测试过，应该是浅复制）。但是没有复写finalize方法（所以一共也就只有10种方法）

属性只有一个，即length，表明该数组的元素大小。

数组和集合的转换：

如果想把集合转换成数组，可以通过接口List的toArray方法进行。

    /**
     * Returns an array containing all of the elements in this list in proper
     * sequence (from first to last element).
     *
     * <p>The returned array will be "safe" in that no references to it are
     * maintained by this list.  (In other words, this method must
     * allocate a new array even if this list is backed by an array).
     * The caller is thus free to modify the returned array.
     *
     * <p>This method acts as bridge between array-based and collection-based
     * APIs.
     *
     * @return an array containing all of the elements in this list in proper
     *         sequence
     * @see Arrays#asList(Object[])
     */
    Object[] toArray();

数组转换成集合。

Arrays.asList(T... t);

    /**
     * Returns a fixed-size list backed by the specified array.  (Changes to
     * the returned list "write through" to the array.)  This method acts
     * as bridge between array-based and collection-based APIs, in
     * combination with {@link Collection#toArray}.  The returned list is
     * serializable and implements {@link RandomAccess}.
     *
     * <p>This method also provides a convenient way to create a fixed-size
     * list initialized to contain several elements:
     * <pre>
     *     List<String> stooges = Arrays.asList("Larry", "Moe", "Curly");
     * </pre>
     *
     * @param a the array by which the list will be backed
     * @return a list view of the specified array
     */
    @SafeVarargs
    public static <T> List<T> asList(T... a) {
        return new ArrayList<>(a);
    }