CodeFutures, a supplier of database performance tools, is now the sponsor of MapDB, a database for Java developers. MapDB provides a way to access a database from Java because it uses the Java ...

System.out.println(values); How to add multiple values per key to a Java HashMap It seems like an oversight for the standard Java API not to have a collection class that allows a key to have multiple ...

Donald Raab, creator of GS Collections, open sourced by Goldman Sachs in 2012, reveals the power of that framework, and how together with Lambda expressions, it sprinkles Java with some of the ...

Part 2 explores type dependency in the Java Collections API, in generics, and in lambda expressions. We’ll jump right in, so if you haven’t already read Part 1, I recommend starting there.

A key feature in Version 4.2 is a Java collections API that allows groups of Java objects to be easily stored, updated, and queried in a transactional, recoverable manner, Sleepycat said.