Lesson 1 - Intro to Java Language

As of 2023, what do you think is the top three (3) programming languages employers want in job candidates?

• Python

• Java

• SQL

• JavaScript

Answer explanation

As of 2023, here is the ranking for Top Programming Languages Employers Want in Job Candidates:

(1) Python

(2) SQL

(3) Java

(4) JavaScript

(5) C

A Java program can be run on any platform or operating system e.g. Windows, Linux or Solaris without any change. Java is said to be...

• Robust

• Secure

• High Performance

• Platform Independent

Choose the correct devices that Java language can be integrated into.

• Airplane systems

• Robots

• ATM

• Medical Devices

JSE is a computing platform in which we can execute software, and it can be used for development and deployment of portable code for desktop and server environments.

What does JSE stands for?

• Java Standard Environment

• Java Studio Enterprise

• Java Standard Edition

• Not an acronym

JDK is a bundle of software development tools and supporting libraries combined with the Java Runtime Environment (JRE) and Java Virtual Machine (JVM).

What does JDK stands for?

• Java Developers Kit

• Java Development Kit

• Java Developers Knowledge

• Not an acronym

JDK 1.0 or Java 1 started on the year 1996. Going to the present, what do you think is the latest version of Java (as of 2024)?

• JSE 19

• JSE 20

• JSE 21

• JSE 22

Answer explanation

The JSE 22 is reported to be released on 2024. Old versions that are still maintained and that can be used is JSE 8, JSE 11, and JSE 17.

Object Oriented Programming (OOP) divides the program into small parts and refers to them as objects. Available data is capable of moving freely within the system from one function to another.

True or False. Java follows the concept of OOP.

• True

• False

Other programming languages such as C++ uses the run time environment of an operating system, thus, less secured. However, Java language is said to be secured as it uses it own runtime environment called Eclipse. True or False.

• True

• False

Answer explanation

JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed.

Java is said to be robust. Meaning...

• Its exception handling of runtime errors

• It uses runtime environment of its own

• It can be run on any platform or operating system

• It has strict compile time and runtime checking for data types

Answer explanation

Java is robust.

It is strong and reliable.

It provides many safeguards to ensure reliable code.

Has strict compile time and runtime checking for data types.

Automatic garbage collection prevents memory leaks;

Exception handling of runtime errors.

In which industry is Java mostly implemented or used?

• Internet

• Computer Software

• Hospital and Health Care

• Information Technology and Services

Answer explanation

Here is the list of industries Java is used in the following order:

(1) Computer software

(2) Information Technology and Services

(3) Internet

(4) Hospital and Health Care

(5) Higher Education

(6) Marketing and Advertising

(7) Financial Services

(8) Telecommunication

(9) Staffing and Recruiting

(10) Computer Hardware