Learn the four types of polymorphism in Java, then start using subtype polymorphism to execute different forms of the same Java method. Polymorphism refers to the ability of some entities to occur ...

These custom types might be implemented as Data Transfer Objects (DTOs), as JavaBeans, as Value Objects, as Reference Objects, or any other custom type (in Java, typically a class or enum).

The convention for packages is different from the Java naming conventions used for variables, methods and reference types. Packages are always written in lowercase letters, with a dot between words. A ...