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 ...

We will focus on the relationship between polymorphism and Java inheritance. The main thing to keep in mind is that polymorphism requires an inheritance or an interface implementation. You can see ...

It’s easy to remove duplicates from a list in Java. There are a variety of functions in Java ... If you only need a unique list of the duplicate items, you could use a HashSet instead of an ArrayList ...

all the collection classes in the JDK hold data as objects. If a developer has a set of int values they want to store in an ArrayList, it can’t be done. Unless, of course, they use a corresponding ...