What is Java? A Beginners Guide to Java

Beginners Guide to Java: An Overview

What is Java?

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History of Java

Why Use Java?

How does Java work?

• Java code is created using a Java Development Kit (JDK) that is compatible with Windows, Linux, and macOS.
• Programmers use the Java programming language, which the JDK converts to computer-readable code.
• The JDK includes a compiler that translates high-level Java code to bytecode, which is readable by a variety of devices.
• A Java Virtual Machine (JVM) interprets bytecode.
• JVMs may run on a variety of software and hardware platforms, making Java programs portable.
• JVMs load, verify and provide a runtime environment that allows Java code to be executed properly.

Editions in Java

Java Standard Edition

Java Micro Edition

Java Enterprise Edition

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Java Concept

Java primarily depends on the features of object-oriented programming. This programming language assists in simplifying the development of the application and software as well as maintaining some concepts which will be discussed further

• Object: An object is an entity of object-oriented programming that has a particular behavior and a definite status. Class and object in Java are some of the most essential features of Java.

• Class: a class stands for a collection of various objects. To create an object, the class needs to generate some blueprint for it. The class assists in organizing the codes for a particular program.
• Constructor: It seemingly worked as a method, but it is a class name and does not have or return any value.
• Inheritance: in this concept, one particular class needs to have the properties and behavior of their parents' class.
• Polymorphism: Polymorphism is the concept of performing a particular task in various ways. Sometimes programmers use the same, particular word but it means different based on the platforms and contexts.
• Abstraction: this feature in Java shows the relevant and essential details of the task and hides the internal details.
• Encapsulation: as a capsule, this Encapsulation method helps to bind the data and code together.

Java's Component

The Java programming language has three main components, which include:

1. JVM: The Java Virtual Machine (JVM) is a platform-independent Java component that offers an environment for running Java programs. So, the JVM loads the code, validates it, runs it, and offers a runtime environment.
2. JRE: The Java Runtime Environment, or JRE, creates an environment in which Java files can run and execute. It is a software bundle that includes the Java Virtual Machine (JVM), Java class libraries, and the Java class loader.
3. JDK: The Java Development Kit, or JDK, is a software development environment that is used to create Java programs and applets. It is a superset of JRE. The JDK offers a private JVM and a few other tools for completing the construction of a Java program.

Features of Java

1. Java is object-oriented, which allows for the versatile modeling of real-world entities.
2. Java's simple syntax, which is similar to C++, makes it easy to learn and use.
3. Java compiles to bytecode that can run on any platform that supports the JVM.
4. Distributed applications can be built and deployed.
5. Bytecode is platform-independent, allowing it to be executed on any JVM-enabled system.
6. Enables secure application development by including security measures.
7. Code is compiled into bytecode, which is then interpreted by the JVM for improved portability and security.

Java Setup for Windows

1. First, download the Java application for Windows
2. Install the application on Windows
3. Run the file
4. Try to configure the "Installation Wizard".
5. Set the environmental variables in Java programming
6. Test if it is installed correctly

Java QuickStart

Summary