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java8-practice

readme.md

References

Main functional interfaces(6)

  • Consumer => represents an operation that accepts the one argument and returns no result.

  • Supplier => accept no argument and produces a result.

  • Function<T,R> => accept the one argument and produces a result.

  • Predicate => represents the predicate(boolean valued functio)n of one arugment.

  • BinaryOperator => represents an operation upon two operands of the same type, producing a result of the same type as the operands.

  • UnaryOperator => represents an operation on single operands that produces the result of the same type as the operand.

  • Runnable => that takes nothing and returns nothing.

Bi(4)

  • BiConsumer<T,U> => accepts the two input argument and produces no result.
  • BiFunction<T,U,R> => function that accepts the two argument and produces a result.
  • BiPredicate<T,U> => represent the predicate of two arguments.
  • BinaryOperator => above.

Double(6)

  • DoubleConsumer => represents the operation that accepts single double-valued arugment and returns no result.
  • DoubleSupplier => represents the supplier of double-valued result.
  • DoubleFunction => function that accepts a double-valued argument and produces a result.
  • DoublePredicate => represents the predicate of one double-valued arugment.
  • DoubleBinaryOperator => represents the operation upon two double-valued operands and producing a double-valued result.
  • DoubleUnaryOperator => represents the operation on a single double-valued operand and producing a double-valued result.

Int(6)

  • IntConsumer => represent the operation that accepts a single int-valued argument and produces no result.
  • IntSupplier => represents a supplier of int-valued results.
  • IntFunction => represents the function that accepts an int-valued arugment and produces a result.
  • IntPredicate => represents the predicate of one int-valued argument.
  • IntBinaryOperator => represents the operation on two int-valued operands and producing an int-valued result.
  • IntUnaryOperator => represents the operation on a sigle int-valued operands and producing an int-valued result.

Long(6)

  • LongConsumer
  • LongSupplier
  • LongFunction
  • LongPredicate
  • LongBinaryOperator
  • LongUnaryOperator

Boolean(1)

  • BooleanSupplier => supplier of the boolean valued results.

(6)

  • DoubleToIntFunction => represents the function that accepts the a doubled-valued argument and preduces int-values result.
  • DoubleToLongFunction
  • IntToDoubleFunction
  • IntToLongFunction
  • LongToDoubleFunction
  • LongToIntFunction

Object & Consumer(3)

  • ObjIntConsumer => represents an operation that accepts the object-valued and int-valued argument and retuns no argument
  • ObjDoubleConsumer
  • ObjLongConsumer

Function(6)

  • ToDoubleFunction => function that produces a double-valued result.
  • ToLongFunction
  • ToIntFunction
  • ToDoublBiFunction<T,U> => function that accepts the two argument and produces a double-valued result.
  • ToIntDoubleFunction
  • ToLongBiFunction

Optional

  1. static Optional of(T value); => returns the optional with specified present not null value.

  2. static Optional ofNullable(T value) => returns the optional describing the specified value, if not null , otherwise returns an empty optional.

  3. isPresent() => returns true if the value is present.

  4. ifPresent(Consumer<? super T> consumer) => if the value is present then it invokes the specified consumer with the value , otherwise does nothing

  5. T get() => if the value is present then it returns the value otherwise throws NoSuchElementFound Exception.

  6. static Optional empty() => returns empty optional instance.

  7. T orElse(T other) => returns the value if present otherwise returns the other.

  8. T orElseGet(Supplier<? extends T> supplier) => returns the value if present otherwise invokies the supplier and returns its result.

  9. T orElseThrow(Supplier<? extends T> exceptionSupplier) => returns the value if present otherwise throws the exception to be created by the provided supplier.

  10. Optional map(Function<? super T,? extends R>) => if the value is present , applies the provided mapping functions to it and if the result is not null,returns object describing the result

  11. Optional filter<Predicate<? super T>> 12 Optional flatMap<Function<? super T,? extends R>> => if a value is present , it applies the provided optional bearing function to it, returns that result , otherwise returns an empty stream.

  12. boolean equals(T t) => whether the some other Object equal to this Optional

  13. Strinng toString() => returns not empty string representation.

  14. hashCode() => retuns the hash code of the present value . otherwise zero if not presernt.