Becoming popular in the early 1990s and the norm today, object-oriented programming ... data types are called "classes," and one instance of a class is an "object." For example, in a payroll ...

Implementation is done similarly in Java. For example, using the keyword implements will make a Java interface, while the keyword extends makes an abstract class. Encapsulation in object-oriented ...

An introduction to the principles of object-oriented programming. It covers both object-oriented programming techniques and their application to program design including classes ... the level of the ...