Java developers

This rather belongs to dailyWTF.

        StringBuffer sbf1 = new StringBuffer("abcd");
        StringBuffer sbf2 = new StringBuffer("abcd");
        sbf1.equals(sbf2)

will return false!

Hello again. I can't find information about com.sun.* package. I want to know is it good to use classes from this package and is this package implemented on all platforms? What differences between standart java.*, javax.* and com.sun.*?

And another thing: why Eclipse 3.1 is so slow when I want to invoke autocompletion for com.sun.*?

Thanks a lot.

- sim