Exception in thread "main" java.lang.ClassCastException: class Superclass cannot be cast to class Subclass (Superclass and Subclass are in unnamed module of loader 'app') at BadDowncast.main ...

Learn how to use Java annotations to associate metadata with classes, methods, and other application elements in your Java programs. There are times when you need to associate metadata, or data ...

Quite often, a Java class simply represents data. In a data transfer class, no methods are required, the class has no need to support future extensibility and the data itself is immutable for the life ...

The Java input/output (I/O) facilities provide a simple, standardized API for reading and writing character and byte data from various data sources. This article explores the I/O classes ...