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Head First Java, 2nd Edition

Head First Java, 2nd Edition

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Contents

Table of Contents

Head First Java™

A Note Regarding Supplemental Files

What they’re saying about Head First

Praise for Head First Java

Praise for other Head First books co-authored by Kathy and Bert

Creators of the Head First series

How to Use This Book: Intro

1. Dive in A Quick Dip: Breaking the Surface

2. Classes and Objects: A Trip to Objectville

3. Primitives and References: Know Your Variables

4. Methods Use Instance Variables: How Objects Behave

5. Writing a Program: Extra-Strength Methods

6. Get to Know the Java API: Using the Java Library

7. Inheritance and Polymorphism: Better Living in Objectville

8. Interfaces and Abstract Classes: Serious Polymorphism

9. Constructors and Garbage Collection: Life and Death of an Object

10. Numbers and Statics: Numbers Matter

11. Exception Handling: Risky Behavior

12. Getting GUI: A Very Graphic Story

13. Using Swing: Work on Your Swing

14. Serialization and File I/O: Saving Objects

15. Networking and Threads: Make a Connection

Real-time Beat Box Chat

Connecting, Sending, and Receiving

Make a network Socket connection

A TCP port is just a number. A 16-bit number that identifies a specific program on the server

To read data from a Socket, use a BufferedReader

To write data to a Socket, use a PrintWriter

The DailyAdviceClient

DailyAdviceClient code

Writing a simple server

DailyAdviceServer code

Writing a Chat Client

Java has multiple threads but only one Thread class

What does it mean to have more than one call stack?

Every Thread needs a job to do. A method to put on the new thread stack

To make a job for your thread, implement the Runnable interface

The Thread Scheduler

Putting a thread to sleep

Using sleep to make our program more predictable

Making and starting two threads

What will happen?

Um, yes. There IS a dark side

The Ryan and Monica problem, in code

We need the makeWithdrawal ( ) method to run as one atomic thing

Using an object’s lock

The dreaded “Lost Update” problem

Let’s run this code...

Make the increment() method atomic. Synchronize it!

The deadly side of synchronization

New and improved SimpleChatClient

The really really simple Chat Server

16. Collections and Generics: Data structures

17. Package, Jars and Deployment: Release Your Code

18. Remote Deployment with RMI: Distributed Computing

A. Final Code Kitchen

B. The Top Ten Topics that almost made it into the Real Book...

C. This isn’t goodbye

About the Authors

URL

Help

To write data to a Socket, use a PrintWriter

We didn’t use PrintWriter in the last chapter, we used BufferedWriter. We have a choice here, but when you’re writing one String at a time, PrintWriter is the standard choice. And you’ll recognize the two key methods in PrintWriter, print() and println()! Just like good ol’ System.out.

Make a Socket connection to the server
Make a PrintWriter chained to the Socket’s low-level (connection) output stream
Write (print) something

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