class Double { | |
public static Double sum(Double a, Double b) { | |
return null; | |
} | |
} | |
interface BinaryOperator<T> extends BiFunction<T,T,T> { | |
} | |
interface BiFunction<T, U, R> { | |
R apply(T t, U u); | |
} | |
class U { | |
{ | |
BinaryOperator<Double> doubleBinaryOperator = Double::sum; | |
} | |
} |