Do you need to know how to sort Java objects in a collection, array, or map? Here's how to use the Comparable and Comparator interfaces and avoid ClassCastExceptions.

What is the contract between equals() and hashcode()? Learn how these methods work together when comparing objects in Java.

Java array size and length Here are the most important concepts developers must know when they size Java arrays and deal with a Java array’s length: The theoretical maximum Java array size is ...

Here's a quick JDBC with HSQLDB tutorial to get you up and running with Java database connectivity and the popular HyperSQL database.