Get started with polymorphism in Java and how to do method invocation in polymorphic method calls.

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.

For example, a Java program obtains file I/O (input/output) services by creating objects from various file-related classes in Java’s class library and calling their methods.

A good working definition of safety-critical Java code is that it issoftware that must be certified according to DO-178B or equivalentguidelines.