This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Please don't use bold red letters like that. It makes your post hard to read.
Also, it pays to ShowSomeEffort(←click). If you google for java collections tutorial you'll find explanations and examples, and the javadocs for those classes to a good job of explaning their respective purposes.