Java is a programming language that is object-oriented and class-based. It is fast, secure and reliable. Some Java 8 Interview questions will help you understand this topic and help you clear your interview.

Some features of Java 9 are:

  1. Java 9 REPL (JShell).
  2. Factory Methods for Immutable Map, Map.Entry, Set and List.
  3. Private methods in Interfaces.
  4. Java 9 Module System.
  5. Process API Improvements.
  6. Try With Resources Improvement.
  7. Completable Future API Improvements.
  8. Reactive Streams.
  9. Diamond Operator for Anonymous Inner Class.
  10. Optional Class Improvements.

Java 9 REPL (JShell)

Jshell also is known as Java shell is introduced by Oracle Corporation as a new tool. Jshellis also known as REPL (Read Evaluate Print Loop). It is used to test and execute any Java constructs like interface, enum, class, object, statement, etc.

Factory Methods for Immutable Map, Map.Entry, Set and List

In the earlier versions of Java to create immutable collection objects we have to use collection class utility methods. However, these methods are very complicated in their approach. But now Oracle corp has introduced some new convenient factory methods to create immutable lists for empty and non-empty collection objects.

Private methods in Interfaces

In the previous versions of Java, we cannot create private methods. but now in Java 9, we can create private methods to avoid redundant code and more re-usability.

Java 9 Module System

One of the biggest changes in Java 9 features is the Modular system. As a part of  Jigsaw project Oracle Corp has introduced the following features:

  1.  Modular JDK
  2.  Modular Java source code
  3.  Modular runtime images
  4.  Encapsulate Java internal APIs
  5.  Java Platform Module System.

Process API Improvements

The Java SE 9 process API has some improvements and they have also added a couple of new classes and methods for making it easier to control and manage the OS processes.

Two new interfaces in-process API:

  1. Java.lang.ProcessHandle

Try With Resources Improvement

In Java SE 7 a new exception handling construct was introduced: Try-With-Resources. The main goal was to manage the resources automatically. In Java SE 9 there are some improvements to this goal so the readability and verbosity can be improved.

CompletableFuture API Improvements

To solve some problems in Java SE 8 Oracle corp has improved the CompletableFuture API in JAVA SE 9.

Reactive Streams

In Java SE 9 Oracle Corp has also introduced a new reactive streams API. This API is a subscribe/publish framework to apply scalable parallel and asynchronous applications using  Java language.

These are the following API which is introduce to develop reactive streams in Java based applications:

  1. java.util.concurrent.Flow
  2. java.util.concurrent.Flow.Publisher
  3. java.util.concurrent.Flow. Subscriber
  4. java.util.concurrent.Flow.Processor

Diamond Operator for Anonymous Inner Class

In Java SE 7 a new feature was introduced:  Diamond operator to improve the readability and avoid redundant code and verbosity. It was found that there are some limitations in using diamond operators with anonymous inner classes in Java associate. So the Oracle Corp has fixed the issue in Java SE 9.

Optional Class Improvements

Some new methods have been added to Java.util.optional class by Oracle Corp in Java SE 9.

In the end, we can say that Java 9 has a lot of improvements and features which makes it one of the most popular object-oriented languages. These features help us understand how the improvements have been done by oracle corp keeping in mind the users. Best Interview Questions have introduced all the important features with you. If you have some other features in mind then you can share it in the comment section and we can try adding them in the article.