Which symbol is used for comments in Java?

In Java, comments are utilized to improve the readability of the code and to provide explanations or annotations that are not executed as part of the program. The correct answer highlights that both // and /*...*/ are valid comment symbols in Java.

The // symbol is used to create a single-line comment. Anything following this symbol on that line is considered a comment and will not be executed by the compiler. This is useful for adding brief notes or explanations about a particular line or section of code.

The /*...*/ symbol is used for multi-line comments. This notation allows you to comment out blocks of text that can span several lines. This is particularly useful when you want to document larger sections of code or temporarily disable a chunk of code during development.

Therefore, since both methods are valid in Java for commenting, the answer that combines them accurately reflects the options available for comments in the language. This understanding of comments will help students annotate their code effectively, making it easier for themselves and others to read and maintain the code in the future.