January 2020
Beginner
672 pages
18h 17m
English
Content preview from Sams Teach Yourself Java in 21 Days (Covers Java 11/12), 8th Edition
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Lesson 3. Working with Objects
Java is an object-oriented programming language. When you do work in Java, you primarily use objects to get the job done. You create objects, modify them, change their variables, call their methods, and combine them with other objects. You develop classes, create objects out of those classes, and use them with other classes and objects.
In this lesson, you’ll work extensively with objects as you undertake these essential tasks:
Creating objects
Testing and modifying objects’ class and instance variables
Calling an object’s methods
Converting objects from one class to another
Creating New Objects
When you write a Java program, you define a set of classes. As you learned during Lesson 1, “Getting Started with ...
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