Java9 Interview questions for beginners

 Q1: Name some of significant changes in Java 9? 

The most important ones are: -

Module-A new type of Java programming component introduced as a module. This is a collection of named self-describing code and data.

REPL (JShell)-Added Read-Eval-Print Loop (REPL) function to Java platform.

HTTP2 Client-A new HTTP Client API that supports WebSockets and HTTP2 stream and server push capabilities.

Improved JavaDocs-Supports the generation of HTML5 output. Provides a search box for the generated API documentation.

Multi-release JAR-Extends the JAR format so that multiple Java release-specific versions of class files can coexist in a single archive.

 Q2: What are the main features of Java 9?

a) Java Platform Modular System
b) J Shell: Interactive JavaREPL
c) Private Interface Method
d) HTTP / 2
e) Improved Java Document
f) Multi-Release JAR

Q3: What are the advantages of Java 9 module system?

a) More Consistent Performance
b) Stronger Encapsulation
c) More Flexibility for Scaling
d) Better Performance

Q4: What is REPL in Java 9?

The REPL is the Read-Evaluate-Print-Loop console that ships with Java 9. The REPL allows users to run arbitrary code snippets and evaluate the results.

Q5: What is the stream improvement of Java 9?

Here are some improvements to Java 9 streams:
a) stream takeWhile / dropWhile
b) stream iteration
c) nullable stream

Q6: What are the improvements done for Try with Resources in Java 9?

The try-resource block serves to automatically close the resource after use.
The main drawback of this was that the resource had to be declared locally within that block.
Java 9 does not require local resource references to be declared.

Q7: What is JShell in Java 9?

The Java Shell Tool (JShell) is an interactive tool for learning the Java programming language and prototyping Java code. JShell is a Read-Evaluate-Print (REPL) loop that evaluates declarations, statements, and expressions as you type and displays the results immediately. This tool is run from the command line.

Q8: What is multi-release jar format in Java 9?

Multi-release JARs allow users to create a single JAR that contains bytecode for multiple versions of Java. The JVM then loads the code contained in that version.

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