T1
T2
R
Lambda
Lambda2<T1,T2>
LambdaN
LambdaR<T1>
LambdaRN<R>
@FunctionalInterface public interface R2<T1,T2,R> extends LambdaRN<R>, Lambda2<T1,T2>
$(T1 t1, T2 t2)
arity
hasThrows
isVoid
R $(T1 t1, T2 t2)
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