java - Can someone explain what this error means please? -

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java.lang.nullpointerexception     @ java.lang.integer.compareto(unknown source)     @ java.lang.integer.compareto(unknown source)

i edited code, deleted no methods changed name of 1 or two, , now...boom! nothing works ! annoying because had working, went , commented , can't see whats changed...help ? :)

you're trying this:

integer = null; integer j = 42; i.compareto(j); // throws nullpointerexception since null

or this:

integer = 21; integer j = null; i.compareto(j); // throws nullpointerexception since j null

but haven't shown code.


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