Java.util package tutorial
Java.util package contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes.
This reference will take you through simple and practical methods available in java.util package.
This reference has been prepared for the beginners to help them understand the basic functionality related to all the methods available in Java.util package.
Before you start doing practice with various types of examples given in this reference, I'm making an assumption that you are already aware of basic Java Programming.