Mapping between Numeric Streams – Oracle Certified Professional Java SE 17 Developer

Building Streams – Streams

07/23/2024Aspects of Streams, Revisited, Converting between Stream Types, Execution Mode of a Stream, Mapping between Numeric Streams, Oracle Exams, Selecting Distinct Elements Standard

16.4 Building Streams A stream must have a data source. In this section we will explore how streams can be created from various data sources: collections, arrays, specified values, generator functions, strings, and I/O channels, among others. Aspects to Consider When Creating Streams When creating a stream from a data source, certain aspects to consider […]

Mapping between Numeric Streams – Streams

02/23/2024Mapping between Numeric Streams, Oracle Exams Standard

Mapping between Numeric Streams In contrast to the methods in the Stream<T> interface, the map() and the flatMap() methods of the numeric stream interfaces transform a numeric stream to a numeric stream of the same primitive type; that is, they do not change the type of the numeric stream. The map() operation in the stream […]

Using Generator Functions to Build Infinite Streams – Streams

10/23/2023Aspects of Streams, Revisited, Mapping between Numeric Streams, Oracle Exams Standard

Using Generator Functions to Build Infinite Streams The generate() and iterate() methods of the core stream interfaces can be used to create infinite sequential streams that are unordered or ordered, respectively. Infinite streams need to be truncated explicitly in order for the terminal operation to complete execution, or the operation will not terminate. Some stateful […]

Streams from Collections – Streams

05/23/2023Converting between Stream Types, Mapping between Numeric Streams, Oracle Exams Standard

Streams from Collections The default methods stream() and parallelStream() of the Collection interface create streams with collections as the data source. Collections are the only data source that provide the parallelStream() method to create a parallel stream directly. Otherwise, the parallel() intermediate operation must be used in the stream pipeline. The following default methods for […]

Setting a Stream as Unordered – Streams

01/23/2023Execution Mode of a Stream, Mapping between Numeric Streams, Oracle Exams Standard

Setting a Stream as Unordered The unordered() intermediate operation does not actually reorder the elements in the stream to make them unordered. It just removes the ordered constraint on a stream if this constraint is set for the stream, indicating that stream operations can choose to ignore its encounter order. Indicating the stream to be […]

Streams from Factory Methods in the Files Class – Streams

11/23/2022Mapping between Numeric Streams, Oracle Exams, Selecting Distinct Elements Standard

Streams from Factory Methods in the Files Class A detailed discussion of the NIO2 File API that provides the classes for creating the various streams for reading files, finding files, and walking directories in the file system can be found in Chapter 21, p. 1285. Analogous to the lines() method in the BufferedReader class, a […]

Streams from Arrays – Streams

10/23/2022Aspects of Streams, Revisited, Converting between Stream Types, Execution Mode of a Stream, Mapping between Numeric Streams, Oracle Exams, Selecting Distinct Elements Standard

Streams from Arrays We have seen examples of creating streams from arrays when discussing the variable arity of() method of the stream interfaces and the overloaded Arrays.stream() methods earlier in the chapter (p. 893). The sequential stream created from an array has the same order as the positional order of the elements in the array. […]

Streams from a CharSequence – Streams

08/23/2022Mapping between Numeric Streams, Oracle Exams Standard

Streams from a CharSequence The CharSequence.chars() method creates a finite sequential ordered IntStream from a sequence of char values. The IntStream must be transformed to a Stream<Character> in order to handle the values as Characters. The IntStream.mapToObj() method can be used for this purpose, as shown at (2). A cast is necessary at (2) in […]

Truncating a Stream – Streams

11/23/2021Aspects of Streams, Revisited, Mapping between Numeric Streams, Oracle Exams Standard

Truncating a Stream The limit() operation returns an output stream whose maximum size is equal to the max size specified as an argument to the method. The input stream is only truncated if its size is greater than the specified max size. In Figure 16.6, Query 4 creates a list with the first two CDs […]

Flattening Streams – Streams

07/23/2021Converting between Stream Types, Mapping between Numeric Streams, Oracle Exams Standard

Flattening Streams The flatMap() operation first maps each element in the input stream to a mapped stream, and then flattens the mapped streams to a single stream—that is, the elements of each mapped stream are incorporated into a single stream when the pipeline is executed. In other words, each element in the input stream may […]

Category : Mapping between Numeric Streams