In this Java 101 tutorial, I’ve explained how interfaces differ from classes, and showed you how to declare, implement, and extend interfaces in your Java programs.

The Java 2 SDK organizes its vast collection of classes and interfaces into a tree-like hierarchy of packages within packages, which is equivalent to directories within directories.

To enable serialization, a class must implement the Serializable interface. This is known as a marker interface, meaning it doesn’t have any methods, but it serves as a flag to the Java Virtual ...

While there are workarounds -- for example, you could introduce a Factory class to generate transaction objects -- this adds complexity and could become a maintenance burden. Another approach could be ...

Here’s an example of how a Function and lambda expression work together: Function<Integer, String> verboseLambda = (Integer x)-> { return Integer. toString (x*x); }; System.

Java is influenced by C and C++, so it has many similarities with those languages (and C#). One of the big advantages of Java is that it is “platform independent.” This means that code you ...