Introduction to Java

Question 1

What is Java?

Answer 1

Java is a high level object oriented programing language developed by sun micro systems but it now owned by oracle it was developed for interact tv, but has now been adapted for gerneral computing

Question 2

Can you explain the evolution of Java?

Answer 2

Remember: 15 year Old 69 what the hotes rappter between 2004 to 2011, fell up, but had a come back in 2017

The evolution of Java

1991: Sun microsystems start a project called oak lead by James Gosling

1995: Oak is reneamed to Java an is lunched

1996: JDK 1.0 is released

1999: JIT or Just in time compilers were introduced together with UI framework called Swing

2004 to 2011: Java 5 to Java 7 intodruce generics, enums, and impove performance

2017 to present: Java has now adopted a 6 month release cycle leading to various java versions over time with the lates being java 24

Question 3

Why did java become popular or What are the advantages of Java

Answer 3

• Plartform independence
• Robust Security features
• a rech set of libraries and frame works
• Strong community and coperate support

Question 4

What does WORA stand for?

Answer 4

Write Once Run Anywhere

Question 5

Explain the concept of platform Indepencence?

Answer 5

Java programs can run on any device or operating system with modfication provided the system contains the Java virtual machine

Question 6

What are the three features of Java?

Answer 6

• The JDK
• The JRE
• The JVM

Question 7

What is the JDK?

Answer 7

It is a combination of the JRE, JVM and other development tools to write, compile and execute java programs

Question 8

What is the JRE?

Answer 8

It is a set of standard librabries that allow the execution of java programs, together with the JVM

Question 9

What is the JVM

Answer 9

It is an abstarct machine that executes java byte code, ans is a compination of class loaders, byte code verifiers, and an interpreter or the JIT(Just In Time Compiler) .

Question 10

What are the different Editions of java?

Answer 10

Acronym: SEEEMEFX

1. Java SE (Standard Edition)
2. Java EE (Enterprise Edition)
3. Java ME (Micro Edition)
4. Java FX

Question 11

What is the purpose of the java SE?

Answer 11

For general pupose, desktop, and server-side application programming

Question 12

What is the purpose of the Javae EE?

Answer 12

Developing lage scale web or enterprise applications

Question 13

What is the purpose of the java ME?

Answer 13

Developing Embeded systems, and mobile device OS

Question 14

What is the purpose of java FX

Answer 14

Developing rich desktop user interfaces.

Question 15

What are some applications of Java Programming?

Answer 15

1. Web applications: The Javae EE is used for web applications think spring boot, ava server pages(JSP), applets, et.c
2. Mobile Applications: Java is the primary language for android app development with the Android SDK framework
3. Enterprise applications: Java is used in ERP’s, banking systems, etc
4. Desktop GUI: Java FX and Swing are used to build deskop UI
5. Embeded Systems and IoT: Java ME powers TVS, smart appliances, ATM’s and IoT devices