03 Java Features

7/27/2019 03 Java Features

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Amity School of Engineering

B.Tech., CSE(5th Sem.)

Java Programming

Topic: Features of Java

ANIL SAROLIYA


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Some Revision of Programming

Software: It is the logical part of computer system, which is made up by severalprograms. In short, It is set of Programs.

Program: These are the set of instructions directing the computer to do some

action

Machine language: This language is directly access by computer system. It is

based on circuit switching, means mapping the binary values(based on only 0, 1

combinations) towards circuit.

High-level programming languages

Languages approximating(similar to) natural language syntax

Example terms: read, write, and add

Syntax: This is the grammatical rules of programming language

Compiler: It translates high-level code into object program or object code

Interpreter: It converts and executes statements line by line (but directly into

machine code)

Debugging: Its locating(discovering or finding) and repairing the errors


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Learning About Java

Java was developed by Sun Microsystems

Object-oriented language modeled after C++

Designed for interactive Web-based applications

Also suitable for general purpose applications

Java is architecturally neutral

(Means Machine Independent orOperating System(OS) Independent)

Java Source Code is compiled and interpreted

Source code: It is the form of Java program

Java programs run on Java Virtual Machine (JVM)

Three step process from source code to executable

Source code written in text editor

Java compiler translates into bytecode (binary program)

Java interpreter executes the bytecode line by line in JVM


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Features of Java (Through features you can also define the java)

Simple

Object Oriented

Distributed

Interpreted

Robust

Secure

Architecture NeutralPortable

High Performance

Multithreaded and Dynamic programming language.

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Java is Simple

Java was developed by taking the best points from

other programming languages,

It manly borrows the C and C++ syntax

Is free from pointers

Uses Garbage Collection (Automatic)

Does not use header files and preprocessors (like

#include or #define)

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Java is Object Oriented Java is not hybrid like C++.

Java supports the basic notions of OO Methodology:

Encapsulation

Data Abstraction

Inheritance (gives the reusability aspect)

Single and multiple inheritance

Polymorphism Persistence [object (data) survives in the program execution time]

Delegation

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Java is distributed by nature

Works on a variety of platforms

Provides support for:

Networking: via Socket Programming

Internet: The widely used protocols like HTTP and FTP are

developed in java

Remote Objects: Internet programmers can call functions on

above protocols and can get access the files from any remotemachine on the internet rather than writing codes on their local

system.

Example: Remote Method Invocation

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The Java Compiler generates bytecode for a JVM (Java Virtual

Machine)

A Java Interpreter is needed to execute the bytecode

9Java Program codedby the Programmer

Intermediate form between

High Level Language code to

machine code

Java Virtual Machine,

it converts bytecodeinto machine language

JAVA is Interpreted


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JAVA is Robust (Strong)

Exception and Error handling

Multi-Tasking

Memory protection and management

Allows Modular development

Extensive compile-time checking

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JAVA is Secure

The Java language has built-in capabilities to ensure that

violations of security do not occur.

The features of bytecode and its interpretation, preventunintentional or intentional sabotage of compiled programs.

Java uses the public key encryption system to allow the

java applications to transmit over the internet in the secureencrypted form.

Apart from all these, java security has been considered in

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JAVA is Architecture Neutral Bytecode can run on any platform (with the help of JVM).

Write once run anywhere.

JDK implementation on many platforms.

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JAVA is Portable

The bytecodes can be run on virtual machines (VM) above

different operating systems :

MacOS, Windows XP/Vista/2007,

Solaris,

It can also run directly on hardware

OS2, Linux,

Unix, etc


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JAVA is High-Performance

Java language supports many high-performance features such as

multithreading, just-in-time compiling, and native code usage.

Multithreading concept allows the java programming language to do

more than one task in a program

Some times interpreted code are proper for particular hardware (processor

and its instruction set), for this JIT compilers were introduced.

JIT compilers (available with latest JVM) again compiles the interpretedcode at run time and gives almost native code (only made for specific type

of hardware according to its instruction-set ) speed.

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Thanks

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Amity School of Engineering

B.Tech., CSE(5th Sem.)

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03 Java Features