What are the overloads of java Reduce?

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);

rrree

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