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What is Java?
Java is:
Object Oriented
Platform independent:
Simple
Secure
Architectural- neutral
Portable
Robust
Multi-threaded
Interpreted
High Performance
Distributed
Dynamic
Java Environment Setup:
Java SE is freely available from the link Download Java. So you download a version based on your operating system.
You can refer to installation guide for a complete detail.
Java Basic Syntax:
Object - Objects have states and behaviors. Example: A dog has states-color, name, breed as well as behaviors -wagging, barking, eating. An object is an instance of a class.
Class - A class can be defined as a template/ blue print that describe the behaviors/states that object of its type support.
Methods - A method is basically a behavior. A class can contain many methods. It is in methods where the logics are written, data is manipulated and all the actions are executed.
Instant Variables - Each object has its unique set of instant variables. An object's state is created by the values assigned to these instant variables.
First Java Program:
Let us look at a simple code that would print the words Hello World. public class MyFirstJavaProgram{
/* This is my first java program. * This will print 'Hello World' as the output */
public static void main(String []args){ System.out.println("Hello World"); // prints Hello World }
}
About Java programs, it is very important to keep in mind the following points.
Case Sensitivity - Java is case sensitive which means identifier Hello and hello would have different meaning in Java.
Class Names - For all class names the first letter should be in Upper Case.
If several words are used to form a name of the class each inner words first letter should be in Upper Case.
Example class MyFirstJavaClass
Method Names - All method names should start with a Lower Case letter.
If several words are used to form the name of the method, then each inner word's first letter should
Java is:
Object Oriented
Platform independent:
Simple
Secure
Architectural- neutral
Portable
Robust
Multi-threaded
Interpreted
High Performance
Distributed
Dynamic
Java Environment Setup:
Java SE is freely available from the link Download Java. So you download a version based on your operating system.
You can refer to installation guide for a complete detail.
Java Basic Syntax:
Object - Objects have states and behaviors. Example: A dog has states-color, name, breed as well as behaviors -wagging, barking, eating. An object is an instance of a class.
Class - A class can be defined as a template/ blue print that describe the behaviors/states that object of its type support.
Methods - A method is basically a behavior. A class can contain many methods. It is in methods where the logics are written, data is manipulated and all the actions are executed.
Instant Variables - Each object has its unique set of instant variables. An object's state is created by the values assigned to these instant variables.
First Java Program:
Let us look at a simple code that would print the words Hello World. public class MyFirstJavaProgram{
/* This is my first java program. * This will print 'Hello World' as the output */
public static void main(String []args){ System.out.println("Hello World"); // prints Hello World }
}
About Java programs, it is very important to keep in mind the following points.
Case Sensitivity - Java is case sensitive which means identifier Hello and hello would have different meaning in Java.
Class Names - For all class names the first letter should be in Upper Case.
If several words are used to form a name of the class each inner words first letter should be in Upper Case.
Example class MyFirstJavaClass
Method Names - All method names should start with a Lower Case letter.
If several words are used to form the name of the method, then each inner word's first letter should