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java.lang.* Trial and Error

For the last few hours I’ve been trying to find out which classes behave like java.lang.Object, i.e. which cannot be amended by a field. When I do not attempt to add fields to all of java.lang.*, it seems to work, but there are 230 classes in that package, and of course I want to treat as many of these classes just like the rest. I hope I don’t have to exclude too many classes.


It seems like excluding java.lang.Object and — interestingly enough — java.lang.String is enough. I’m not worried about Object, as I mentioned before nothing is ever just an Object. But how am I supposed to handle strings?

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