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Friday, August 10, 2018

Introduction to Java



Introduction to Java
 

i) Introducing Java Programming Language

ii) Java Environment Setup

iii) Java Program Structure
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i) Introducing Java Programming Language
 

> Java Programming Language was developed at Lord's Day Microsystems inwards 1991 (The offset publicly available version of Java (Java 1.0) released inwards 1995, Now it is subsidiary of Oracle corporation.

> Java is an Object oriented Programming language, In Java every affair is object, coffee tin hold out easily extended since it is based on Object model.

> Java is a Platform independent language, it tin hold out compiled together with Interpreted.

> Java is simple, slow to acquire together with implement.

> Java is Securable, using Java nosotros tin railroad train virus costless together with tamper costless systems.
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Usage of Java
 

> To railroad train Desktop Applications (ex: Acrobat Reader)

> To railroad train Web Applications

> To railroad train Enterprise Applications (Ex: Banking, Insurance Applications etc...)

> To railroad train Mobile Applications

> To railroad train Embedded Systems.

> Smart Cards

> Games software etc...
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> Test Automation
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Java Syntax Rules
 

> Java is a illustration sensitive language.

> First missive of the alphabet of Class mention should hold out inwards Upper case.

> Method names should laid about amongst lower illustration letter.

> Java plan file mention should just fit amongst shape name.

> Java plan execution starts from primary method, which is mandatory inwards every Java program.

> Every statement/step should halt amongst semi colon symbol.

> Code blocks enclosed amongst {}.
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ii) Java Environment Setup
 

Steps:
 

1) Download Java Software (JDK) together with Install.

2) Set Environment Variable path (Path variable)

3) Download Eclipse IDE together with extract
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Download Java (JDK) Software from either java.com or oracle.com, together with Install.

After Java Installation together with then y'all tin decease Java folder inwards C:\Program Files.
-----------------------------
Set Environment Variable path (Path variable)
 

Navigation
 

First guide maintain jdk bin directory path

Select MyComputer together with correct click
> Properties
> Advanced System Settings
> Environment Variables
> Select Path variable from organisation variables
> Edit
> Paste coffee bin directory path inwards variable value field
> OK
> Ok
>OK
> Close
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1) write together with execute a Java plan using ascendance promt.

2) write together with execute a Java plan using Eclipse IDE.
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1) write together with execute a Java plan using ascendance prompt.
 

In Computer Programming nosotros guide maintain iii steps.

i) Write Program

ii) Compile the Program

iii) Run / Execute the program.
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Step 1: Write a Program
 

public shape Sample {
public static void primary (String [] args) {
System.out.println ("Hello Java World");
}
}
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Step 2: Compile the Program
 

> Launch Command prompt
> Chang to Java plan file directory.
> Type javac Sample.java

* It creates Java shape file
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Step 3: Run / Execute the program.
 

Type coffee Sample

Then it display the Output on the Console.
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2) write together with execute a Java plan using Eclipse IDE.
 

Eclipse IDE (Integrated Development Environment)

> Eclipse IDE is a platform to write together with execute estimator programs similar Java, Perl, Python, Ruby, PHP etc...

> Eclipse IDE is opened upwards source.

> It provides Editor for writing programs, Syntax guidence, Context help, car compilation etc...
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Steps to Write together with Execute a Java Program using Eclipse IDE :
 

> Launch Eclipse IDE

> Create Java Project

> Create Java Package

> Create Java Class

Write Java Program together with Run.

Note: Eclipse IDE provides car compilation facility.
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A Sample Java Program
 

package abcd;
public shape Smitha {
public static void main(String[] args) {
int a = 100;
System.out.println("Hello Java");
System.out.println(a);
}
}
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