java - "Safe"在 Collections.toArray() JavaDoc 中意味着什么？

Question

当我阅读java源代码时，我发现在集合接口(interface)中，会很安全

The returned array will be "safe" in that no references to it are Maintained by this collection.(In other words, this method must allocate a new array even if this collection is backed by an array).The caller is thus free to modify the returned array.

我不明白什么意思，你能给我举个例子吗？

Answer 1

当然:

List<String> list = Arrays.asList("foo", "bar", "baz");
String[] array = list.toArray(new String[0]);
array[0] = "qux";
System.out.println(list.get(0));  // still "foo"