Util package In Java

Package java.util contain the collections frame legacy collection classes, date and time facilities, event model, internationalization, and miscellaneous utility classes such as -a string tokenizer, random-number generator, and a bit array.

1. Collection
2. Comparator
3. Iterator & ListIterator
4. Enumeration
5. EventListener
6. Map
7. Observer
8. RandomAccess
9. Set
10. SortedMap & SortedSet