which of the following are types of comments in java code example

Example 1: java comments

//Single line
System.out.println("Hello world"/*+"This is code commented out inline."*/); //You can also put comments at the end
/*
Multi
Line
comment
*/

Example 2: comments in java

// single line comment example
// integer variable 'a' is assigned value 5
int a = 5;

/*
This is
an example for
java multiline comment
*/

// Documentation comments example
/**
* <h1>Area of Square</h1>
* Area of Square java program calculates area
* using given side value and prints the area.
* <p>
* <b>Note: Adding comments in a java program makes it more
* user friendly and is presumed as good quality code
* 
* @author Sachin
* @version 1.0
* @since 2015-04-12
* </b>
* </p>
*/