Features of Java (or) Java Buzz words

 Features of Java  (or) Java Buzz words 

The primary objective of Java programming language creation was to make it portable, simple and secure programming language. Apart from this, there are also some excellent features which play an important role in the popularity of this language. The features of Java are also known as java buzzwords.A list of most important features of Java language is given below.

1. Simple
2. Object-Oriented
3. Portable
4. Platform independent
5. Secured
6. Robust
7. Architecture neutral
8. Interpreted
9. High Performance
10. Multithreaded
11. Distributed
12. Dynamic

Simple :

Java is very easy to learn, and its syntax is simple, clean and easy to understand. According to Sun, Java language is a simple programming language because:

• Java syntax is based on C++ (so easier for programmers to learn it after C++).
• Java has removed many complicated and rarely-used features, for example, explicit pointers, operator overloading, etc.
• There is no need to remove unreferenced objects because there is an Automatic Garbage Collection in Java.

Object-oriented:

Java is an object-oriented programming language. Everything in Java is an object. Object-oriented means we organize our software as a combination of different types of objects that incorporates both data and behavior.  Object-oriented programming (OOPs) is a methodology that simplifies software development and maintenance by providing some rules.

Basic concepts of OOPs are:

1. Object
2. Class
3. Inheritance
4. Polymorphism
5. Abstraction
6. Encapsulation

Platform Independent

Java is platform independent because it is different from other languages like C, C++, etc. which are compiled into platform specific machines while Java is a write once, run anywhere language. A platform is the hardware or software environment in which a program runs.

Robust

Robust simply means strong. Java is robust because:

o        It uses strong memory management.

o        There is a lack of pointers that avoids security problems.

o        There is automatic garbage collection in java which runs on the Java Virtual Machine to get rid of objects which are not being used by a Java application anymore.

o        There are exception handling and the type checking mechanism in Java. All these points make Java robust.

Architecture-neutral

Java is architecture neutral because there are no implementation dependent features, for example, the size of primitive types is fixed.

In C programming, int data type occupies 2 bytes of memory for 32-bit architecture and 4 bytes of memory for 64-bit architecture. However, it occupies 4 bytes of memory for both 32 and 64-bit architectures in Java.

Portable

Java is portable because it facilitates you to carry the Java bytecode to any platform. It doesn't require any implementation.

High-performance

Java is faster than other traditional interpreted programming languages because Java bytecode is "close" to native code. It is still a little bit slower than a compiled language (e.g., C++). Java is an interpreted language that is why it is slower than compiled languages, e.g., C, C++, etc.

Distributed

Java is distributed because it facilitates users to create distributed applications in Java. RMI and EJB are used for creating distributed applications. This feature of Java makes us able to access files by calling the methods from any machine on the internet.

Multi-threaded

A thread is like a separate program, executing concurrently. We can write Java programs that deal with many tasks at once by defining multiple threads. The main advantage of multi-threading is that it doesn't occupy memory for each thread. It shares a common memory area. Threads are important for multi-media, Web applications, etc.

Dynamic

Java is a dynamic language. It supports dynamic loading of classes. It means classes are loaded on demand. It also supports functions from its native languages, i.e., C and C++.

Java supports dynamic compilation and automatic memory management (garbage collection).

FOP versus OOP
	Function Oriented Programming (FOP)	Object Oriented Programming (OOP)
Program organization	Program is divided into small parts called functions.	Program is divided into parts called objects.
Importance	Importance is not given to data but to functions	Importance is given to the data rather than procedures
Approach	FOP follows top down approach	OOP follows bottom up approach
Access Specifiers	Does not have any access specifier	Has three access specifiers, namely Public, Private, Protected
Data Moving	Data can move freely from function to function in the system	Objects can move and communicate with each other
Maintainability	To add new data and function is not so easy	Provides an easy way to add new data and function
Data Access	Function uses global data for sharing that can be accessed freely from function to function in the  system.	Object uses local data and can be accessed in a control manner
Data Hiding	No data hiding is possible, hence security is not possible	Provides data hiding, hence secured programming is possible
Overloading	Polymorphism is not possible	Polymorphism is possible
Examples	C, Visual Basic, FORTRAN, Pascal.	C++, JAVA, VB.NET, C#.NET.

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Java Class and Objects

 

Classes and Objects in Java

In Java, classes and objects are basic concepts of Object Oriented Programming (OOPs) that are used to represent real-world concepts and entities. The class represents a group of objects having similar properties and behavior. For example, the animal type Dog is a class while a particular dog named Tommy is an object of the Dog class.

Java Classes

A class in Java is a set of objects which shares common characteristics/ behavior and common properties/ attributes. It is a user-defined blueprint or prototype from which objects are created. For example, Student is a class while a particular student named Ravi is an object.

class Circle {

double x,y; // The coordinates of the center

double r;          // The radius

// Method that returns circumference

double circumference(){

return 2*3.14159*r;

}

// Method that returns area double area(){

return (22/7)*r*r;

}

}

class CircleDemo1 {

public static void main(String args[]){ Circle c = new Circle();

c.x = 0.0;

c.y = 0.0;

c.r = 5.0;

System.out.println("Circumference" + c.circumference());

System.out.println("Area" + c.area());

}

}

Points to remember:

1. There should be a class which contains a method main(). This class is called main class.
2. There should be only one main class.
3. The name of the program file should be same as the name of the main class followed by .java as an extension.
4. If there is no main class, then there should be compilation error.

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1. Atlassian Women Tech 3.0 Intern

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1. Linear Algebra - Scalars, Vectors, Matrices and Tensors

2. Linear Algebra (Matrix operations)

Java: 

1. Class and Objects

Deep learning  CNN