Install libfastutil-java by entering the following commands in the terminal:
sudo apt update sudo apt install libfastutil-java
Description:
Java API providing type-specific maps, sets, lists and queues
Fastutil extends the Java™ Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files. . The classes implement their standard counterpart interface (e.g., Map for maps) and can be plugged into existing code. Moreover, they provide additional features (such as bidirectional iterators) that are not available in the standard classes. . Besides objects and primitive types, fastutil classes provide support for references, that is, objects that are compared using the equality operator rather than the equals() method.
Homepage: http://fastutil.di.unimi.it/
Version: 7.1.0-2
Section: universe/java