Re: HashMap.put error in Xcode

From:

"Mike Schilling" <mscottschilling@hotmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 22 Apr 2007 19:40:39 GMT

Message-ID:

<XSOWh.17509$JZ3.13807@newssvr13.news.prodigy.net>

"Composer" <composer@uwclub.net> wrote in message
news:1177264618.014691.17080@n59g2000hsh.googlegroups.com...

I'm using Apple's Xcode 1.1 and have had no big problem with it until
now. I've created a HashMap and used the put() method to insert a
BitSet into it, but cannot get the compiler to like it. A paraphrase
of my code:

import java.util.*;
HashMap hm = new HashMap(72);
BitSet bs = new BitSet(12);
hm.put(bs.hashCode(), bs);

The error message from Xcode is:

cannot resolve symbol : method put(int,java.util.BitSet)

If I change the BitSet to a String, or change the HashMap to a
Hashtable, I get the same error. I don't understand this, because the
put() method takes an integer and an Object, and I believe that's what
I'm providing it. Is it possible that Xcode 1.1 is doing something
wrong? Thanks.

HashMap requires an Object as the key. This will compile if you code

hm.put(new Integer(bs.hashCode()), bs);

But it seems unlikely that hashCode() will give you a useful key. It's not
something you're likely to know if you don't already have the object handy,
nor is it guaranteed to be unique. What are you trying to do?