Why Grapheme Array Is Improve Than String For Storing Password Inwards Java
Why grapheme array is meliorate than String for storing password inward Java was recent enquiry asked to i of my friend inward a coffee interview. he was interviewing for a Technical atomic number 82 position together with has over half dozen years of experience.Both Character array together with String tin travel used to shop text information but choosing i over other is hard enquiry if you lot haven't faced the province of affairs already. But equally my friend said whatever enquiry related to String must convey a clue on especial belongings of Strings similar immutability together with he used that to convince interviewer. hither nosotros volition explore closed to reasons on why should you lot used char[] for storing password than String.
Why String is immutable inward Java or How Substring tin drive retention leak inward Java, if you lot haven't read those you lot may uncovering them interesting.Here are few reasons which makes feel to believe that grapheme array is meliorate selection for storing password inward Java than String:
1) Since Strings are immutable inward Java if you lot shop password equally evidently text it volition travel available inward retention until Garbage collector clears it together with since String are used inward String puddle for reusability at that spot is pretty high direct chances that it volition travel stay inward retention for long duration, which pose a safety threat. Since whatever i who has access to retention dump tin uncovering the password inward clear text together with that's closed to other argue you lot should e'er used an encrypted password than evidently text. Since Strings are immutable at that spot is no means contents of Strings tin travel changed because any alter volition arrive at novel String, piece if you lot char[] you lot tin however laid all his chemical subdivision equally blank or zero. So Storing password inward grapheme array clearly mitigates safety jeopardy of stealing password.
2) Java itself recommends using getPassword() method of JPasswordField which returns a char[] together with deprecated getText() method which returns password inward clear text stating safety reason. Its expert to follow advice from Java squad together with adhering to measure rather than going against it.
3) With String at that spot is e'er a jeopardy of printing evidently text inward log file or console but if purpose Array you lot won't impress contents of array instead its retention place larn printed. though non a existent argue but however brand sense.
String strPassword="Unknown";
char[] charPassword= new char[]{'U','n','k','w','o','n'};
System.out.println("String password: " + strPassword);
System.out.println("Character password: " + charPassword);
String password: Unknown
Character password: [C@110b053
char[] charPassword= new char[]{'U','n','k','w','o','n'};
System.out.println("String password: " + strPassword);
System.out.println("Character password: " + charPassword);
String password: Unknown
Character password: [C@110b053
That's all on why grapheme array is meliorate selection than String for storing passwords inward Java. Though using char[] is non merely plenty you lot demand to erase content to travel to a greater extent than secure. I likewise advise working amongst hash'd or encrypted password instead of evidently text together with clearing it from retention equally presently equally authentication is completed.
Further Learning
Data Structures together with Algorithms: Deep Dive Using Java
Why multiple inheritance is non supported inward Java
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