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By Monica Pawlan
July 1999

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This series of lessons builds on the material presented in Java Programming Language Basics, Part 1, which introduced applications, applets, and servlets; simple file and database access operations; and remote method invocation (RMI).

The lessons and code examples for Part 2 are somewhat more complex. They walk you through network communications, building a user interface using more components, data encryption and decryption (pseudo code only), grouping multiple data elements into one object (collections), and internationalizing a program. Part 2 concludes with some object-oriented programming concepts.

Note: This tutorial is available as a book from online book sellers.

Contents

Lesson 1: Socket Communications

• What are Sockets and Threads?
• About the Examples
• Example 1: Server-Side Program
• Example 1: Client-Side Program
• Example 2: Multithreaded Server Example
• More Information

Lesson 2: User Interfaces Revisited

• About the Example
• Fruit Order Client Code
  • Global Variables
  • Constructor
  • Event Handling
  • Cursor Focus
  • Converting Strings to Numbers and Back
• Server Program Code
• View Order Client Code
• Program Improvements
• More Information

Lesson 3: Cryptography

• About the Example
• Running the Example
• Pseudo Code
• More Information

Lesson 4: Serialization

• About the Example
• Wrapping the Data
• Sending Data
• Server Program
• Receiving Data
• More Information

Lesson 5: Collections

• About Collections
• Creating a Set
• Printing
• More Information

Lesson 6: Internationalization

• Identify Culturally Dependent Data
• Create Keyword and Value Pair Files
• Internationalize Application Text
• Localize Numbers
• Compile and Run the Application
• Program Improvements
• More Information

Lesson 7: Packages and Java Archive File Format

• Setting up Class Packages
  • Create the Directories
  • Declare the Packages
  • Make Classes and Fields Accessible
  • Change Client Code to Find the Properties File
  • Compile and Run the Example
• Using JAR Files to Deploy
  • Server Set of Files
  • Fruit Order Client Set of Files
  • View Order Client Set of Files
  • More Information

Lesson 8: Object-Oriented Programming

• Object-Oriented Programming Defined
• Classes
• Objects
• Well-Defined Boundaries and Cooperation
• Inheritance
• Polymorphism
• Data Access Levels
• Your Own Classes
• Program Improvements
• More Information

In Closing

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