Why is executing Java code in comments with certain Unicode characters allowed?

In Java, executing code within comments is not allowed, regardless of the characters used. Comments in Java are meant for documentation and explanations, and any code placed within comments is treated as plain text and not executed by the Java compiler. This behavior is consistent across all Unicode characters.

For example, consider the following code:

java

// This is a comment with code: System.out.println("Hello, world!");

Even though the comment contains a line of code (System.out.println("Hello, world!");), it will not be executed by the Java compiler, and it won't produce any output when the program is run. Instead, the entire line is treated as a comment and ignored during compilation and execution.

Java's syntax rules are strict, and code execution is limited to code blocks and statements within method bodies, constructors, and other executable parts of the program. Comments are designed to provide explanations and annotations to improve code readability and maintainability but do not have any impact on the program's behavior when it is executed.

In summary, executing Java code within comments, regardless of the characters used, is not allowed and has no effect on the program's behavior. Comments should only be used for documentation and not for code execution.