public ArrayList(Collection c)方法的一個注釋 c.toArray might (incorrectly) not return Object[] (see 6260652)

/**
 * Constructs a list containing the elements of the specified
 * collection, in the order they are returned by the collection's
 * iterator.
 * 使用集合類對象初始化ArrayList
 *
 * @param c the collection whose elements are to be placed into this list
 * @throws NullPointerException if the specified collection is null
 */
public ArrayList(Collection<? extends E> c) {
    elementData = c.toArray();
    size = elementData.length;
    //剛才看了一眼這個toArray方法，確實有時候返回的不是Obdect[],
    // c.toArray might (incorrectly) not return Object[] (see 6260652)
    if (elementData.getClass() != Object[].class)
        elementData = Arrays.copyOf(elementData, size, Object[].class);
}

　

以上為ArrayList的一個構造函數，在里面有一句

c.toArray might (incorrectly) not return Object[] (see 6260652)
這個注釋，參見bug6260652，java的bug官網http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6260652

問題就在這兒了，List<String> strList= Arrays.asList("abc");返回的結果是String[]，不謝。。。

以下為測試代碼

  public static void main(String[] args) {
        List<String> stringList= Arrays.asList("test");
        Object[] strList=stringList.toArray();
        System.out.println(strList.getClass());
    }

 

結果如下：