Question

I have seen that java provides IntegerCache,ShortCache,ByteCahce.. but there is no cache logic in Double/Float class. Is it because use of double values will not be that much frequent , compared to int?

Answer 1

Java doc of Double#valueOf suggests that there is a cache but there isn’t

Returns a Double instance representing the specified double value. If a new Double instance is not required, this method should generally be used in preference to the constructor Double(double), as this method is likely to yield significantly better space and time performance by caching frequently requested values.

Values from -128 to 127 are cached from all three you have mentioned which are used while auto-boxing.