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Java: Streams & Lambda

36 cards · 🇺🇸 English

Functional-style operations with Java Streams and lambda expressions.

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WORA in Java

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1WORA in Java
Write Once, Run Anywhere - compiled Java code can run on all platforms that support Java without recompiling
2Lambda expression in Java
An anonymous function that can be passed as an argument or assigned to a variable, introduced in Java 8 for functional programming
3Stream API in Java
A functional programming feature for processing sequences of elements, supporting operations like filter, map, and reduce
4Functional interface
An interface with exactly one abstract method that can be implemented using a lambda expression
5Syntax of a lambda expression
(parameters) -> expression or (parameters) -> { statements; }
6Method reference in Java
A shorthand notation for calling a method, written as ClassName::methodName, that can replace a lambda expression
7Filter operation in Stream API
An intermediate operation that returns a stream with elements matching a predicate
8Map operation in Stream API
An intermediate operation that transforms each element in the stream using a function
9Reduce operation
A terminal operation that combines stream elements into a single result using an accumulator function
10intermediate vs terminal operations
Intermediate operations are lazy and return a stream; terminal operations trigger computation and return a result
11ForEach in Stream API
A terminal operation that performs an action for each element in the stream
12Collect in Stream API
A terminal operation that accumulates stream elements into a collection or other result container
13Parallel streams
Streams that process elements in parallel using multiple threads for improved performance on multi-core systems
14Create a parallel stream
Call .parallelStream() on a collection or .parallel() on an existing stream
15FindFirst operation
A terminal operation that returns an Optional containing the first element of the stream
16AnyMatch operation
A terminal operation that returns true if any element in the stream matches the predicate
17Optional in Java
A container object that may or may not contain a non-null value, used to avoid NullPointerException
18FlatMap in Stream API
An intermediate operation that flattens nested streams, transforming each element into a stream and concatenating them
19Distinct in Stream API
An intermediate operation that returns a stream with duplicate elements removed
20Sorted in Stream API
An intermediate operation that returns a stream with elements sorted according to natural order or a comparator
21Limit in Stream API
An intermediate operation that truncates the stream to contain no more than a specified number of elements
22Skip in Stream API
An intermediate operation that discards the first n elements of the stream
23Count in Stream API
A terminal operation that returns the number of elements in the stream
24Predicate functional interface
A functional interface representing a boolean-valued function of one argument, used for filtering
25Function functional interface
A functional interface representing a function that accepts one argument and produces a result
26Consumer functional interface
A functional interface representing an operation that accepts a single input and returns no result
27Supplier functional interface
A functional interface representing a supplier of results, taking no arguments and producing a value
28Lazy evaluation in streams
Intermediate operations are not executed until a terminal operation is invoked, optimizing performance
29Java.util.stream package
The package containing classes and interfaces for functional-style operations on streams of elements
30Benefit of using streams over loops
More concise and readable code, automatic parallelization, and better separation of concerns