Arrays.asList(), huh?--透明思考

Arrays.asList(), huh?- -

Dion says (http://www.almaer.com/blog/archives/000639.html):

I think that the Arrays.* methods are not that well known among Java developers.

But it's not true. If your application involved with any remoting ... in fact, any customized serialization (such as XMLEncoder/XMLDecoder), Arrays.asList() can be an error prone. Its result is of type java.util.Arrays$ArrayList, a private type, so serialization framework cannot instantiate it. And so...

For example, you can run the following JUnit test case:

public void testXmlSerialize() throws Exception {
Object[] anArray = new Object[]{"Jeff"};
List aList = Arrays.asList(anArray);

ByteArrayOutputStream baos = new ByteArrayOutputStream();
XMLEncoder encoder = new XMLEncoder(baos);
encoder.writeObject(aList);
encoder.close();
byte[] someBytes = baos.toByteArray();

String result = new String(someBytes);
System.out.println(result);
// huh, our content is missed
assertTrue(result.indexOf("Jeff") == -1);
}

I found this bug when using Hessian remoting. If you want some simplified syntax for List initialization, try this:

List aList = new ArrayList() {
{
add("Jeff");
add("Gigix");
}
};

- 作者：透明 2005年01月18日, 星期二 17:41

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透明思考