Though Java already has a character type and char keyword to represent and manipulate characters, the language also requires a Character class for two reasons: Character c1 = new Character ('A'); ...

In #93, we implement StringBuilder/StringBuffer serialization by converting to/from java.lang.String, which have some copy cost. A better solution is tackle inner data structure to avoid this copy.

Strings are often used to hold sensitive data such as database URLs, usernames, passwords, and file paths. If strings were mutable, an attacker could change the content of these strings and ...