小编Ami*_*adi的帖子

Oracle 临时表中提交的目的是什么？交易范围：

ON COMMIT DELETE ROWS

当前事务的提交或当前会话中发生的任何提交？

我有一些像这样的代码:

    String[] colors = {"black", "blue", "yellow", "red", "pink", "green", "cyan"};
    String[] alphabets = {"A", "B", "C", "D", "E", "F", "G", "H", "I"};
    LinkedList<String> links = new LinkedList<>(Arrays.asList(colors));
    System.out.println(links);
    colors = links.toArray(alphabets);
    System.out.println(Arrays.asList(colors));

它的输出是:

[black, blue, yellow, red, pink, green, cyan]
[black, blue, yellow, red, pink, green, cyan, null, I]

第二个输出行中的null是什么？为什么？