About asterisks

Question

What is the function of the asterisk again?

Answer 1

/* comments */
/** comments for javadoc tool */

Answer 2

Commentary is any additional text, a note written for people reading the code for better understand. The compiler ignores it.
in your example:

class TheirClass {
/*
this is example of comment
this comment is longer
*/

// other way how to write comment, just for one line
String main;
}

Answer 3

what are comments?