1. One-parameter reduce
format
Optional<T> reduce(BinaryOperator<T> accumulator)
T result = a[0];
for (int i = 1; i < n; i++) {
result = accumulator.apply(result, a[i]);
}
return result;2. Two-parameter reduce
Format
T reduce(T identity, BinaryOperator<T> accumulator)
T result = identity;
for (int i = 0; i < n; i++) {
result = accumulator.apply(result, a[i]);
}
return result;3. Reduce with three parameters, in which the get and set methods are omitted when used.
Format
<U> U reduce(U identity, BiFunction<U, ? super T, U> accumulator,BinaryOperator<U> combiner);
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