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Josephin


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JAVA PROGRAMMING FOR BEGINNERS
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                                                  JAVA PROGRAMMING FOR BEGINNERS

Introduction to Java 

                                      Java is defined by a specification and consists of a programming language, a compiler, core libraries and a runtime (Java virtual machine) The Java runtime allows software developers to write program code in other languages than the Java programming language which still runs on the Java virtual machine. The Java platform is usually associated with the Java virtual machineand the Java core libraries.

 Properties of Java

·        Platform independent

·        Object-orientated programming language

·        Strongly-typed programming language

·        Interpreted and compiled language

·        Automatic memory management

 

Java virtual machine

        The Java virtual machine (JVM) is a software implementation of a computer that executes programs like a real machine.

The Java virtual machine is written specifically for a specific operating system, e.g., for Linux a special implementation is required as well as for Windows.

                            

Classes and Objects

                                       

                Classes and Objects are basic concepts of Object Oriented Programming which revolve around the real life entities.

Classes in Java

         The class is a group of similar entities. It is only an logical component and not the physical entity. A class can contain any of the following variable types.

Local variables − Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.

Instance variables − Instance variables are variables within a class but outside any method. These variables are initialized when the class is instantiated. Instance variables can be accessed from inside any method, constructor or blocks of that particular class.

Class variables − Class variables are variables declared within a class, outside any method, with the static keyword.

 

 Object in Java

                  An Object contains both the data and the function, which operates on the data. An entity that has state and behaviour is known as an object e.g., chair, bike, marker, pen, table, car, etc. It can be physical or logical (tangible and intangible).

             

The example of an intangible object is the banking system. An object has three characteristics:

State: represents the data (value) of an object.

Behaviour: represents the behaviour (functionality) of an object such as deposit, withdraw, etc.

Identity: An object identity is typically implemented via a unique ID. The value of the ID is not visible to the external user. However, it is used internally by the JVM to identify each object uniquely.

Example - chair, bike, marker, pen, table, car, etc.

Classification of OOPS

·        Unstructured Programming Languages

·        Structured Programming Languages

·        Object Oriented Programming

Unstructured Programming Languages

LET S = 0 

MAT INPUT V

LET N = NUM

IF N = 0 THEN 99

FOR I = 1 TO N

LET S = S + V(I)

NEXT I

PRINT S/N

GO TO 5

END

 

Structured Programming Languages

In object oriented programming, program is divided into small parts called objects. ... In object oriented programming, data is more important than function. Procedural programming is based on unreal world. Object oriented programming is based on real world.

Object Oriented Programming

Object-oriented programming (OOP) refers to a type of computer programming (software design) in which programmers define not only the data type of a data structure, but also the types of operations (functions) that can be applied to the data structure.

Conclusion: for further details about Java and step by step explanation visit. https://www.credosystemz.com/java-training/



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priyaldave


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Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. Java is known for its simplicity, ease of use, and portability. Java is an object-oriented language, with a simple, clear syntax. Java is platform-independent, meaning that programs written in Java can run on any operating system that supports the Java Runtime Environment, Java is used in a wide variety of applications, from desktop to enterprise and from web-based to embedded systems.

For More Visit : Java classes in Pune



-- Edited by priyaldave on Tuesday 29th of November 2022 11:28:36 AM

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Annyjones01


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Certainly! If you're new to Java programming, here's a basic introduction and some key concepts to get you started. We'll cover the essentials to help you begin your journey as a Java programmer.

What is Java?
Java is a versatile and widely-used programming language known for its platform independence, object-oriented nature, and strong community support. It's used for a variety of applications, including web development, mobile app development (Android), backend server applications, and more.

Setting Up Your Environment:
To write and run Java programs, you'll need to set up your development environment:

Install Java Development Kit (JDK): Download and install the latest version of the Java JDK from the official Oracle website or an OpenJDK distribution.

Choose a Text Editor or Integrated Development Environment (IDE): You can write Java code using a simple text editor (e.g., Notepad) or use a dedicated Java IDE like Eclipse, IntelliJ IDEA, or NetBeans. IDEs provide tools to make coding and debugging easier.

Basic Java Concepts:
Let's cover some fundamental Java concepts:

Hello World Program:

java
Copy code
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
This is the simplest Java program, which prints "Hello, World!" to the console.
Comments: You can add comments to your code to make it more readable. Single-line comments start with //, and multi-line comments are enclosed within /* */.

Data Types: Java has various data types for storing different kinds of values, including int, double, boolean, and String.

Variables: Declare variables to store data. Example:

java
Copy code
int age = 25;
double price = 19.99;
String name = "John";
Operators: Use operators like +, -, *, /, and % for arithmetic operations.

Control Statements: Java supports control statements like if, else, while, for, and switch for decision-making and looping.

Methods: Functions in Java are called methods. You can create your own methods to perform specific tasks.

Object-Oriented Programming (OOP):
Java is an object-oriented programming language, which means it revolves around the concept of objects. Key OOP concepts in Java include:

Classes and Objects: Classes define the blueprint for objects, while objects are instances of classes.

Inheritance: Allows you to create a new class based on an existing class, inheriting its properties and methods.

Polymorphism: Enables objects of different classes to be treated as objects of a common superclass.

Encapsulation: Encapsulates data and methods within a class, hiding the internal details and exposing a public interface.

Abstraction: Focuses on essential features while hiding the non-essential details.

Getting Started:
Start by writing simple programs to get a feel for the language.
Explore Java's standard library (Java API) for built-in classes and methods.
Read Java tutorials and books for beginners to deepen your understanding.
Practice regularly and solve coding challenges to build your skills.
Join online Java communities, forums, and consider taking online courses.
Remember that programming is a skill that improves with practice. Start small, be patient, and gradually take on more complex projects as you become more comfortable with Java.

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