You should almost always use equals. You can be certain that string1 == string2 will work if: You’ve already made sure you’ve got distinct values in some other way (e.g. you’re using string values fetched from a set, but comparing them for some other reason) You know you’re dealing with compile-time string constants You’ve manually … Read more
String interning is implementation specific and shouldn’t be relied upon, use equality testing if you want to check two strings are identical.
Yes. In general any literal string, identifier, or other constant string in JS source is interned. However implementation details (exactly what is interned for instance) varies, as well as when the interning occurs. Note that a string value is not the same as a String Object though, String Objects are not interned because that would … Read more
Java automatically interns String literals. This means that in many cases, the == operator appears to work for Strings in the same way that it does for ints or other primitive values. Since interning is automatic for String literals, the intern() method is to be used on Strings constructed with new String() Using your example: … Read more
This is implementation-specific, but your interpreter is probably interning compile-time constants but not the results of run-time expressions. In what follows CPython 3.9.0+ is used. In the second example, the expression “strin”+”g” is evaluated at compile time, and is replaced with “string”. This makes the first two examples behave the same. If we examine the … Read more
http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#intern() Basically doing String.intern() on a series of strings will ensure that all strings having same contents share same memory. So if you have list of names where ‘john’ appears 1000 times, by interning you ensure only one ‘john’ is actually allocated memory. This can be useful to reduce memory requirements of your program. But … Read more