Stream API
stream.filter().map().collect()
public List stringTransform_upperCase(List namesList){
return namesList
.parallelStream()
.map(String::toLowerCase) // Intermediate operation
.collect(Collectors.toList()); //Terminal operation
}
The entire operation is called Pipeline
Summary Table
| Interface | Functional Method Signature | Use Case Example |
|---|---|---|
Predicate<T> |
boolean test(T t) |
Used in filter |
Function<T, R> |
R apply(T t) |
Used in map |
Consumer<T> |
void accept(T t) |
Used in forEach |
Supplier<T> |
T get() |
Used in Stream.generate |
BinaryOperator<T> |
T apply(T t1, T t2) |
Used in reduce |
UnaryOperator<T> |
T apply(T t) |
Similar to Function<T, T> |