Tag Archives: UML

Java interface can extend many interfaces

Posted on July 15, 2011 by Brian

Java is an object oriented programming language that follows these rules: An interface may extend any number of interfaces A class may extend no more than one class A class may implement any number of interfaces Implementation of these rules … Continue reading →

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Working with arrays of objects

Posted on July 15, 2011 by Brian

Consider the following UML class diagram which shows the relationship between a superclass (Vehicle) and two subclasses (Motorbike and Car). Because Motorbike is a Vehicle and Car is a Vehicle, we can create an array of vehicles like this: The … Continue reading →

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UML Composition Relationship — Java code example

Posted on July 4, 2011 by Brian

The UML diagram shown below describes a composition relationship between Book and Page. This is a strong type of relationship — Book is responsible for creating, managing, and destroying all instances of Page. The filled-in diamond indicates this is a … Continue reading →

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Java nested classes explained (alien head example)

Posted on June 4, 2011 by Brian

Are you confused about Java nested classes? Do you know the difference between an inner class and an outer class? How about a static nested class and an inner class? I have written this brief guide to revise these terms … Continue reading →

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