Language Java Tutorial

It is good practice to write comments explaining your code.
There are two types of comments in Java, both with syntax similar to comments in C and C++.
Traditional comments: Enclose a traditional comment in /* and */.
End-of-line comments: Use double slashes (//) which causes the rest of the line ignored by the compiler.
Traditional comments do not nest, which means

/*
  /* comment 1 */
  comment 2 */
is invalid because the first */ after the first /* will terminate
which will generate a compiler error
End-of-line comments can contain anything, including the sequences of characters /* and */, such as this:

// /* this comment is okay */