XML

XStream
XStream is a simple library to serialize objects to XML and back again.

Java-Zone

Thinking in Java, Introduction

The Java Tutorials

LRU cache

http://www.khanspot.com/2006/11/27/a-simple-lru-cache-in-5-lines/

http://www.roseindia.net/java/example/java/util/LRUCacheExample.shtml

Java Util

Making a Collection Read-Only:

Creating a Hash Table : Java Util

Finding an Element in a Sorted Array

Determining the Number of Days in a Month

Thinking in Java,Collections of Objects performance

Controlling Java heap size (memory) allocation

The Java serialization algorithm revealed

Lock Objects