asList(T... a)

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/**
     * 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 Collection.toArray.  The returned list is
     * serializable and implements {@link RandomAccess}.
     *
     * 
This method also provides a convenient way to create a fixed-size
     * list initialized to contain several elements:
     * 
     *     List stooges = Arrays.asList("Larry", "Moe", "Curly");
     * 
     *
     * @param a the array by which the list will be backed.
     * @return a list view of the specified array.
     * @see Collection#toArray()
     */
    public static  List asList(T... a) {
	    return new ArrayList(a);
    }

从上面的说明中可以发现，他返回的是一个固定大小的list，所以后面如果你进行添加元素的操作时，他就会报unSupport Operation异常。