sealed classes can improve effectiveness and clarify the intended usage patterns for developers using the code. Sealed classes in Java represent a significant step forward in the language's ongoing ...

A class can implement multiple interfaces ... Only functional interfaces can use the lambda feature in Java. Abstract classes with only one abstract method cannot use lambdas.

Solve real world problems with Java using multiple classes. Learn how to create programming solutions that scale using Java interfaces. Recognize that software engineering is more than writing code - ...

See how to read the file to get the data back and process it. Organize information using multiple classes in Java's class hierarchy and inheritance. Explore some of the hundreds of classes that are ...