how the memory location takes place in this code ? and what happen when we create sub-string of string whether the new allocation of string is created by sub-string?

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C#

String a="abc";
String b="xyz";
String c=a+b;

Posted 27-Jun-15 7:14am

shivakumar rudroju

Updated 27-Jun-15 7:19am

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-06-27T07:42:00

In all cases you described, new piece of memory is allocated for new string object.

But this does not happen in all cases. To understand different cases of memory allocation, you have to understand two facts: 1) Java strings are immutable objects, 2) string interning is used.

Please see:
https://en.wikipedia.org/wiki/String_interning[^],
http://javatechniques.com/blog/string-equality-and-interning[^].

By the way, look at this interesting answers to the questions not directly related to yours:

Strings are immutable: http://stackoverflow.com/questions/25138587/what-is-difference-between-mutable-and-immutable-string-in-java[^];
Interning: http://stackoverflow.com/questions/1091045/is-it-good-practice-to-use-java-lang-string-intern[^].

—SA