Writing Comments in Java

Objective :

• How to write comments in Java?
• How to write single line comment in Java?
• How to write multi line comment in Java?
• How to write documentation comment in Java?
• What are the types of comments in Java?

Writing Comments in Java :

• Comments are the statements which are never executed (i.e. non-executable statements).
• Comments are often used to add notes between source code so that it becomes easy to understand & explain the function or operation of the corresponding part of source code.
• Java Compiler doesn’t read comments; comments are simply ignored during compilation.
• There are 3 types of comments available in Java as follows;

1. Single Line Comment
2. Multi Line Comment
3. Documentation Comment

Single Line Comment :

This comment is used whenever we need to write anything in single line.

Syntax : 

//< write comment here >

Example :

//This is Single Line Comment.

Multi Line Comment :

This type of comments are used whenever we want to write detailed notes (i.e. more than one line or in multiple lines)related to source code.

Syntax :

/*

< write comment here >

*/

Example :  

/*

This

Is

The

Multi

Line

Comment

*/

Documentation Comment :

• The documentation comment is used commonly to produce the javadoc for the respective program.
• The javadoc is generally HTML, if used in project it is a set of multiple HTML files describing each java program in the corresponding project.
• In the documentation comment we can add different notations such as author of the project or program, version, parameters required, information on results in return if any, etc.
• To add these notations, we have ‘@’ operator.  We just need to write the required notation along with the ‘@’ operator.
• Some javadoc tags are;
• @author – To describe the author of the project.
• @version – To describe the version of the project.
• @param – To explain the parameters required to perform respective operation.
• @return – To explain the return type of the project.

Syntax :

/**

*< write comment/description here >

*@author

*@version

*@param

*@return

*/

Example :  

/**

*This is Documentation Comment.

*@author Atul Palandurkar

*@version 1.0.0

*/

Shutting down 100 times faster

Hey frinds, do you want to Shut down your computer 100 times faster?

Procedure :

*Press ctrl+alt+del to open Task Manager

* Click the Shutdown Tab.

* Holding ctrl key, Press TURN OFF

Done!

Escape Sequences in Java

Objectives :

• What are the escape sequences in Java?
• What are the escape characters in Java?

Generally we enter all the characters directly. The escape sequences are used for those characters which cannot be entered directly.

Sequence	Purpose
\n	New Line (i.e. Line feed)
\b	Backspace
\t	Tab
\r	Carriage return
\f	Form Feed
\\	Backslash
\’	Single quote
\”	Double quote
\ddd	Octal Characters (i.e. ddd)
\uxxxx	Hexadecimal Unicode Characters (i.e. xxxx)
Escape Sequences in Java

Boost performance of computer/laptop

Objective :

* How to boost performance of computer/laptop?
* How to speed up computer/laptop?
* How to increase Virtual Memory of computer/laptop?
* How to increase performance of computer/laptop?

Procedure :

1. Right click "My Computer".
2. Go to "Properties" option from pop-up menu.
3. Go to "Advanced" tab.
4. Go to "Performnce" option.
5. Go to "Advancd".
6. Change "Virtual Memory" as follows :
    a. Kep Initial Size = Same
    b. Set Max Size = Double