Java Essential Training: Objects and APIs

Learn Java 9, in part two of our essential training series. Learn about debugging, creating custom classes, working with inheritance, and more.

Introduction

• Welcome
• What you should know
• How to use the exercise files
• Which version of Java do you want to learn?

1. Exception Handling and Debugging

• Syntax errors vs. exceptions
• Debug with IntelliJ IDEA
• Handle exceptions with try-catch
• Create multiple catch blocks
• Checked vs. unchecked exceptions

2. Create Custom Classes

• About encapsulation
• Use the Java runtime classes
• Wrap code in static methods
• Declare and use custom classes
• Organize code with packages
• Create and use instance methods
• Manage state with instance variables
• Declare multiple constructor methods
• Use static fields as constants
• Declare and use enum types
• Organize code with nested types

3. Work with Inheritance

• About inheritance and polymorphism
• Extend classes and override methods
• Cast objects as different types
• Create and implement interfaces
• Use abstract classes and methods

4. Manage Data Collections

• Store values in simple arrays
• Manage resizable arrays with List
• Manage key-value pairs with Map

5. Use Java Packages and Libraries

• Work with dates and times
• Copy files with readers and buffers
• Copy files with Path and Files classes
• Parse a JSON file
• Include packages with modules

6. Prepare a Java Application for Deployment

• Document code with Javadoc
• Package classes in JAR files

Conclusion

• Next steps