evolution of java and key features

Question 1

Who developed the Java programming language?

Answer 1

James Gosling and his team at Sun Microsystems

Java was initially called Oak before being renamed to Java.

Question 2

What was the slogan for the first public release of Java?

Answer 2

“Write Once, Run Anywhere” (WORA)

The first public release was Java 1.0 in 1995.

Question 3

What year was Java 1.1 released and what features did it introduce?

Answer 3

1997: Inner classes, JavaBeans, JDBC

JDBC stands for Java Database Connectivity.

Question 4

What major features were introduced in Java 2?

Answer 4

• Swing
• Collection Framework
• JIT (Just-In-Time) Compiler

These features enhanced Java’s performance and usability.

Question 5

What improvements were made in Java SE 5?

Answer 5

• Generics
• Enhanced for-loop
• Annotations
• Autoboxing

Java SE 5 was released in 2004.

Question 6

What significant performance improvements were introduced in Java SE 6?

Answer 6

Improved performance and Web Services support

Java SE 6 was released in 2006.

Question 7

List three features introduced in Java SE 7.

Answer 7

• try-with-resources
• Diamond Operator
• Improved exception handling

Java SE 7 was released in 2011.

Question 8

What are the major features of Java SE 8?

Answer 8

• Lambda Expressions
• Streams API
• Default Methods
• New Date-Time API

Java SE 8 was released in 2014.

Question 9

What is Project Jigsaw introduced in Java SE 9?

Answer 9

Modules

Project Jigsaw was part of efforts to improve modularity in Java.

Question 10

What new feature was introduced in Java 10?

Answer 10

Var keyword

This feature allows for local variable type inference.

Question 11

What is a key feature of Java that supports parallel execution?

Answer 11

Multi-threading

Java allows multiple threads to run concurrently.

Question 12

What does Java’s automatic memory management utilize?

Answer 12

Garbage Collection

This helps in reclaiming memory automatically.

Question 13

What is one of the security features built into Java?

Answer 13

Bytecode verification

This helps ensure that the bytecode adheres to Java’s safety standards.

Question 14

What does platform independence in Java refer to?

Answer 14

Java bytecode runs on JVM, making it cross-platform

This allows Java applications to run on any device with a compatible JVM.

Question 15

What feature of Java supports Encapsulation, Inheritance, Polymorphism, and Abstraction?

Answer 15

Object-Oriented Programming

These principles are fundamental to Java’s design.

Question 16

What are some enhancements introduced in Java SE 14 and 15?

Answer 16

• Records
• Sealed Classes

These features simplify data modeling and restrict class inheritance.

Question 17

What is the latest Long-Term Support (LTS) version of Java?

Answer 17

Java 21

It includes enhanced pattern matching, garbage collection, and performance improvements.

Question 18

True or False: Java supports automatic memory management through manual memory allocation.

Answer 18

False

Java uses Garbage Collection for memory management.

Question 19

What is the purpose of the Just-In-Time (JIT) compiler in Java?

Answer 19

Improves performance by compiling bytecode into native machine code

This allows for faster execution of Java applications.