Here are the most important concepts developers must know when they size Java arrays and deal with a Java array’s length: To determine the size of a Java array, query its length property. Here is an ...

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. Programmers frequently need ...

Another type of array in Java is the map. A map is an associative array that uses key/value pairs that do not change. This is a perfect way to store phone numbers, for example. Here, you might use ...