class Test { | |
public static final BinaryOperator<Integer> rPlus = (x, y) -> x + y; | |
interface BinaryOperator<T> extends Combiner<T,T,T> { | |
public T operate(T left, T right); | |
@Override | |
default T combine(T t1, T t2) { | |
return operate(t1, t2); | |
} | |
} | |
interface Combiner<T, U, V> { | |
V combine(T t, U u); | |
} | |
} |