To make every object in Java, you need to invoke the mighty constructor! A step-by-step animation gently takes you through territory that's usually difficult to understand. In this video, gain a detailed understanding of how constructors work.
- [Speaker] To create objects in Java we use a constructor. … Here, I've written some code for a character class. … And, you can see that a character has 2 member variables. … One for name, and one for species. … Each character we create should have a different name … and species that's just specific to that object. … And, that's why we need to use the character constructor … to initialize that data. … So, I'm going to start creating a character. … This ones going to be called Bilbo. … And at this point, Java has made a little place in memory … for the character Bilbo, which is an object. … And, inside of the character there are two spaces … for name and species. … They're both blank right now. … Now, I want to initialize Bilbo with specific data … to describe his name and species. … And to do that, I'm going to use the new keyword … which we'll call a constructor. … So, when this code is run. … It sets the name inside of the Bilbo object to Bilbo. … To the string Bilbo, and species to the string hobbit. …
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: The mighty constructor