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You can include comments in Java programs in two ways. First,
whenever the Java compiler encounters two adjacent forward slashes,
//, anywhere in a line, the Java compiler ignores both slashes
and the remainder of the line on which the slashes appear:
// Short comment
Second, whenever Java encounters a slash followed
immediately by an asterisk, /*, Java ignores both
of those
characters and all other characters up to and including the next
asterisk followed immediately by a slash, */.
/* Long comment that just goes on and on */
If you wish to test how a program works when you remove certain lines of source code, you can hide those lines in a comment, instead of deleting them.