java - _ (underscore) is a reserved keyword -


i've replaced s in following lambda expression _:

s -> integer.parseint(s)

eclipse compiler says:

'_' should not used identifier, since reserved keyword source level 1.8 on.

i haven't found explanation in jls §3.9 lexical structure / keywords.

the place jls §15.27.1. lambda parameters

it compile-time error if lambda parameter has name _ (that is, single underscore character).

the use of variable name _ in context discouraged. future versions of java programming language may reserve name keyword and/or give special semantics.

so eclipse message misleading, same message used both cases, when error generated lambda parameter or when warning generated other _ identifier.


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