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Java 8, released by Oracle on March 18, 2014, was a landmark update to the Java programming language. It introduced a host of powerful features that significantly enhanced the language’s capabilities, especially around functional programming and stream processing.
Java 8 Features With Programming Examples
Java 8 introduced significant features that enhanced the language's capabilities and promoted a more functional programming style. Key features include:
Lambda Expressions:
Provide a concise syntax for representing anonymous functions, enabling functional programming paradigms.
Functional Interfaces:
Interfaces with a single abstract method, designed to be used with lambda expressions. Examples include Runnable and Comparator.
Stream API:
A powerful API for processing collections of objects in a declarative and functional manner, supporting operations like filtering, mapping, and reducing data.
Default and Static Methods in Interfaces:
Allow adding new methods to interfaces without breaking existing implementations, promoting backward compatibility. Default methods have an implementation, while static methods are utility methods tied to the interface.
Java Date and Time API (JSR 310):
A new, immutable, and thread-safe API for handling dates and times, addressing shortcomings of the older java.util.Date and Calendar classes.
Optional Class:
A container object that may or may not contain a non-null value, used to handle potential null values gracefully and reduce NullPointerException occurrences.
forEach() Method in Iterable Interface:
Allows iterating over elements of a collection in a more concise way, often used with lambda expressions.
Method References:
A shorthand syntax for referring to methods or constructors without executing them, often used with lambda expressions.
Nashorn JavaScript Engine:
An embedded JavaScript engine that allows running JavaScript code directly on the JVM.
Parallel Array Sorting:
Enhanced java.util.Arrays class with parallelSort methods for efficient parallel sorting of large arrays.
Concurrency Enhancements:
Improvements to the java.util.concurrent package, including new classes like LongAdder and DoubleAdder for high-contention scenarios.
Type Annotations:
Expanded annotation support to include type annotations, allowing annotations to be applied to types in various contexts.

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