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

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

java unicode comments

java

Why does this code, written backwards, print "Hello World!"

java unicode right-to-left

java

What are "connecting characters" in Java identifiers?

java unicode identifier scjp

java

What is a "surrogate pair" in Java?

java unicode utf-16 surrogate-pairs

java

Java FileReader encoding issue

java file unicode encoding

java

Converting Symbols, Accent Letters to English Alphabet

java unicode special-characters diacritics

java

Difference between UTF-8 and UTF-16?

java unicode utf-8 utf-16 utf

java

Unicode equivalents for \w and \b in Java regular expressions?

java regex unicode character-properties

java

Creating Unicode character from its number

java string unicode character

java

How can I iterate through the unicode codepoints of a Java String?

java string unicode

java

Java equivalent to JavaScript's encodeURIComponent that produces identical output?

java javascript unicode utf-8

java

Why does Apache Commons consider '१२३' numeric?

java unicode number-systems apache-commons-lang3

java

How can I replace non-printable Unicode characters in Java?

java string unicode

java

Remove diacritical marks (ń ǹ ň ñ ṅ ņ ṇ ṋ ṉ ̈ ɲ ƞ ᶇ ɳ ȵ) from Unicode chars

java unicode diacritics transliteration

java

Regex: what is InCombiningDiacriticalMarks?

java regex unicode

java