Granted, each language has its public and should not be forced to be used in a way it is not designed.
However, Java, and C++ for instance are very alike and can be treated the same. But, on the other hand you should very well know the differences.
As for comments, i love javadoc, really.
Code:
/**
* This is a comment that will show up in a HTML generated file, and with Eclipse it automaticly pops up when i hover my mouse over the function/method
**/
void someFunction() {
// do something
}