Since Java 21, wrapper classes have played an increasingly sophisticated role in Java’s type system. Here’s everything you ...

To illustrate how generics are used in the Java Collections Framework, let’s look at some examples. List and ArrayList with generics. In the above example, we already briefly explored a simpler ...

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 ...

However, instead of returning a single Element, it returns a collection of them. For this Java screen scraper example, we will look at all of the anchor tags on the page and print the URL, or href ...

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 values. If this is an ...