Learning Java by Example

Introduction

• Welcome
• What you need to know
• Using exercise files

1. Create a Command-Line Application That Searches Text Files

• Use a main method to get parameters
• Structuring the code
• Get all the files in a directory
• Open and read each file
• Search text using regular expressions
• Use arrays to store the results
• Add an option to zip the results

2. Create a Command-Line Application That Accesses a Database

• Use a properties file to get parameters
• Use JDBC to access a database
• Use Java crypto to decrypt strings
• Use Java logging to report errors
• Package your application in a JAR file

3. Create a GUI Application That Resizes Images

• Use Swing to create a GUI
• Use anonymous classes and lambdas for buttons
• Use Java 2D classes for image manipulation
• Basic Java math
• Image rotation and saving
• Use message boxes and prompts for user interaction

4. Create a Java API That Searches Stack Overflow

• What is an API?
• Set up the code
• Access webpages using Java.net
• Parse REST calls using JSON-P
• Parse REST calls using Jackson
• Test the API with JUnit
• Final refactoring of classes
• Document the API with Javadoc

Conclusion

• Next steps