You may have guessed that objects are the foundation of object-oriented programming. The reason they were created was to make programming feel intuitive, to mirror how humans experience the world. Learning to write good object-oriented code, that can be reused by others, is the key to being a great Java developer.
- What is an object? Well an object is like a capsule that contains data and behavior. Objects are instances of classes and a class is like a template, like a blank form from which objects are created. Let's imagine an example class Wizard. An object or an instance of that class might be Gandalf. You take the template class Wizard, then you fill in its data, and then you get the object Gandalf. Now Gandalf is an instance of the class Wizard where the properties or member variables have been filled in specific to him. And he exists in a space in memory allocated for a wizard. So an object is a combination of two things: The state of the object, stored as member variables, and a set of methods that give the object the power to do certain tasks. You may have guessed that objects are the foundation of object-oriented programming, and Java. The reason they were created was to make programming feel intuitive, to mirror how we as humans experience the world. Learning to write good object-oriented code that could be reused will make you popular with other humans.
Released
11/11/2019This course was created by Madecraft. We are pleased to host this content in our library.

- What is an object in Java?
- Building Java classes
- Retrieving and updating variables with getters and setters
- Using the static keyword
- Understanding inheritance
- Diagramming code with UML
- Implementing polymorphism
Skill Level Advanced
Duration
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Introduction
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1. The World of Objects
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What is an object in Java?1m 13s
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Prerequisites21s
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Exercise files1m 44s
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2. Inside Classes
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The anatomy of a class1m 48s
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The mighty constructor2m 34s
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Construct a duck3m 18s
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3. Getters and Setters
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Using setters3m 13s
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Testing with JUnit2m 16s
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4. Static
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What is static?1m 26s
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Static runs a marathon5m 58s
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Exercise: Static1m 29s
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5. Inheritance
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The mother of all objects1m 35s
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6. UML
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Drawing with UML2m 44s
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7. Polymorphism
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What is polymorphism?1m 24s
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Polymorphism in action2m 11s
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The purpose of polymorphism1m 17s
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Implements vs. extends1m 59s
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Conclusion
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Next steps1m 30s
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Video: What is an object in Java?