java - Do we have pool of objects for wrapper classes too? -


i clarify few of queries. know wrapper classes final , immutable. have pool of objects string class did? , there mutable versions wrapper classes? string class has mutable versions stringbuilder , stringbuffer.

some wrapper classes (for example long , integer) have cache values (for integer , long, cache values between -128 , 127), behaves string pool, unlike string pool constant, adding new objects not possible.

as second question, i'm assuming it's typo , meant ask if wrapper classes have mutable versions string has stringbuilder. answer no.


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