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* Added utility `jdeps` for analyzing .class files.
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## Q. Can you declare an interface method static?
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Java 8 interface changes include static methods and default methods in interfaces. Prior to Java 8, we could have only method declarations in the interfaces. But from Java 8, we can have default methods and static methods in the interfaces.
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## Q. What is a lambda?
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## Q. What variables do lambda expressions have access to?
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The default methods of the implemented functional interface are not allowed to be accessed inside the lambda expression.
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## Q. How to sort a list of strings using a lambda expression?
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## Q. What is a method reference?
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Method references are potentially more efficient than using lambda expressions. In addition, they provide the compiler with better information about the type, and if you can choose between using a reference to an existing method and using a lambda expression, you should always use a method reference.
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## Q. What types of method references do you know?
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* to the constructor.
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## Q. Explain the expression `System.out::println`?
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The specified expression illustrates passing a reference to a static method of a `println()`class `System.out`.
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## Q. What is a Functional Interface?
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An interface can include as many `default` methods as you like while remaining functional, because `default` methods are not abstract.
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## Q. What is StringJoiner?
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## Q. What are `default`interface methods?
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* One of the main reasons for introducing default methods is the ability of collections in Java 8 to use lambda expressions.
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## Q. How to call `default` interface method in a class that implements this interface?
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## Q. What is `static` interface method?
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* Static methods in the interface are used to provide helper methods, for example, checking for null, sorting collections, etc.
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## Q. How to call `static` interface method?
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## Q. What is Optional
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## Q. What is Stream?
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* support additional end operations `sum()`, `average()`, `mapToObj()`.
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## Q. What are the ways to create a stream?
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## Q. What is the difference between `Collection` and `Stream`?
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Collections allow you to work with elements separately, while streams do not allow this, but instead provides the ability to perform functions on data as one.
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## Q. What is the method `collect()`for streams for?
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## Q. Why do streams use `forEach()`and `forEachOrdered()` methods?
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* `forEachOrdered()` applies a function to each stream object while maintaining the order of the elements.
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## Q. What are `map()`, `mapToInt()`, `mapToDouble()` and `mapToLong()` methods in Stream?
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## Q. What is the purpose of `filter()` method in streams?
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The method `filter()` is an intermediate operation receiving a predicate that filters all elements, returning only those that match the condition.
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## Q. What is the use of `limit()` method in streams?
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The method `limit()`is an intermediate operation, which allows you to limit the selection to a certain number of first elements.
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## Q. What is the use of `sorted()` method in streams?
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The order of the elements in the original collection remains untouched - `sorted()`it just creates its sorted representation.
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## Q. What streamers designed methods `flatMap()`, `flatMapToInt()`, `flatMapToDouble()`, `flatMapToLong()`?
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`flatMapToInt()`, `flatMapToDouble()`, `flatMapToLong()`- are analogues `flatMap()`, returns the corresponding numerical stream.
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## Q. Tell us about parallel processing in Java 8?
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## Q. What are the final methods of working with streams you know?
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## Q. What intermediate methods of working with streams do you know?
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For numerical streams, an additional method is available `mapToObj()`that converts the numerical stream back to the object stream.
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## Q. What additional methods for working with associative arrays (maps) appeared in Java 8?
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## Q. What is LocalDateTime?
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`LocalDateTime`combines together `LocaleDate`and `LocalTime`contains the date and time in the calendar system ISO-8601 without reference to the time zone. Time is stored accurate to the nanosecond. It contains many convenient methods such as plusMinutes, plusHours, isAfter, toSecondOfDay, etc.
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## Q. What is ZonedDateTime?
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`java.time.ZonedDateTime`- an analogue `java.util.Calendar`, a class with the most complete amount of information about the temporary context in the calendar system ISO-8601. It includes a time zone, therefore, this class carries out all operations with time shifts taking into account it.
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## Q. How to determine repeatable annotation?
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## Q. What is Nashorn?
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**Nashorn** is a JavaScript engine developed in Java by Oracle. Designed to provide the ability to embed JavaScript code in Java applications. Compared to Rhino , which is supported by the Mozilla Foundation, Nashorn provides 2 to 10 times better performance, as it compiles code and transfers bytecode to the Java virtual machine directly in memory. Nashorn can compile JavaScript code and generate Java classes that are loaded with a special loader. It is also possible to call Java code directly from JavaScript.
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## Q. What is jjs?
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`jjs` - This is a command line utility that allows you to execute JavaScript programs directly in the console.
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## Q. How to create a Base64 encoder and decoder?
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## Q. What are the functional interfaces `Function<T,R>`, `DoubleFunction<R>`, `IntFunction<R>` and `LongFunction<R>`?
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## Q. What are the functional interfaces `UnaryOperator<T>`, `DoubleUnaryOperator`, `IntUnaryOperator`and `LongUnaryOperator`?
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## Q. What are the functional interfaces `BinaryOperator<T>`, `DoubleBinaryOperator`, `IntBinaryOperator`and `LongBinaryOperator`?
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## Q. What are the functional interfaces `Predicate<T>`, `DoublePredicate`, `IntPredicateand` `LongPredicate`?
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## Q. What are the functional interfaces `Consumer<T>`, `DoubleConsumer`, `IntConsumer`and `LongConsumer`?
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## Q. What are the functional interfaces `Supplier<T>`, `BooleanSupplier`, `DoubleSupplier`, `IntSupplier`and `LongSupplier`?
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#### Q. When do we go for Java 8 Stream API?
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