Java 8 Question
What are the new features in Java8?

Question

Java 8 Question

What are the new features in Java8?

Accepted Answer

1. Lambda Expressions
Lambda expression helps us to write our code in functional style. It provides a clear and concise way to implement SAM interface(Single Abstract Method) by using an expression. It is very useful in collection library in which it helps to iterate, filter and extract data.

2. Method References
Java 8 Method reference is used to refer method of functional interface . It is compact and easy form of lambda expression. Each time when you are using lambda expression to just referring a method, you can replace your lambda expression with method reference.

3. Optional
Java introduced a new class Optional in Java 8. It is a public final class which is used to deal with NullPointerException in Java application. We must import java.util package to use this class. It provides methods to check the presence of value for particular variable.

4. Default Methods
Java provides a facility to create default methods inside the interface. Methods which are defined inside the interface and tagged with default keyword are known as default methods. These methods are non-abstract methods and can have method body.

5. StringJoiner
Java added a new final class StringJoiner in java.util package. It is used to construct a sequence of characters separated by a delimiter. Now, you can create string by passing delimiters like comma(,), hyphen(-) etc.

Accepted Answer

Lambda Expressions: Allows you to write functions in a more concise and functional style.

Functional Interfaces: Interfaces with a single abstract method, used extensively with lambda expressions (e.g., Consumer, Predicate, Supplier).

Streams: A powerful abstraction for working with sequences of data, supporting map, filter, reduce, and other operations.

Default Methods: Methods in interfaces with default implementations to add new methods to existing interfaces without breaking compatibility.

Method References: A shorthand notation for referring to methods by their names.

Optional: A container object which may or may not contain a non-null value, reducingthe likelihood of null pointer exceptions.

New Date and Time API: The java.time package provides comprehensive date and time functionality, overcoming limitations of the old Date and Calendar classes.

Nashorn JavaScript Engine: A lightweight, high-performance JavaScript engine that allows you to run JavaScript code within Java applications.

Accepted Answer

Some of the important Java 8 features are;

forEach() method in Iterable interface
default and static methods in Interfaces
Functional Interfaces and Lambda Expressions
Java Stream API for Bulk Data Operations on Collections
Java Time API
Collection API improvements
Concurrency API improvements
Java IO improvements

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