Comments in java programs serve to explain the lines of code, these comments are "invisible" to the compiler and therefore do not affect the program.
Comments to a single line of text: To use this type of comment should be placed a double slash (/ /) at the beginning of the line.
Review of one or more lines: To use this type of comment should place a + slash asterisk (/ *) at the beginning of the first line of text and an asterisk + slash (* /) at the end of the last line of text.
Comments on Java