The Javadoc API documentation for java.util.Collections explains the basics of this class such as the fact that all of its methods are static and that they all either operate on a provided ...

java.lang.ref: A collection of reference-related language classes, such as SoftReference and ReferenceQueue, organized in the ref sub-subpackage of the java package’s lang subpackage ...

The Java Platform provides the most commonly used data structures in the form of the Collections Framework, and it provides a rich API to operate on them. This article explains the concepts behind ...