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A thread is a single sequential flow of control with its own stack and program counter Programs that use multiple threads appear to be doing more than one thing at a time A thread is able to operate independently of other threads in the same process while, at the same time, sharing all the process objects The Web server itself is an example of where threads can be useful A simple Web server operates as follows: 1 Creates a ServerSocket and invokes its accept() method to wait for HTTP clients requests 2 Gets the client Socket object returned by the accept() method and starts a separate thread to handle its request 3 Returns to Step 1 to accept more requests at the same time the last one is being processed by the other thread Java in general (not only in JSP pages) makes creating and using multiple threads easy Both the language and the class libraries are built from the ground up with threads in mind javalangObject, the ultimate base class of all objects, has methods for synchronizing thread operations, which are inherited by every Java object A thread is represented by an instance of the javalangThread class A new Thread object isn t actually associated with an underlying operating system thread until its start() method is called, which allows its characteristics (name, priority, and so forth) to be set before it starts After start() is called, an operating system thread is created by the Java virtual machine and this thread begins executing the thread s run() method A Thread continues to run until its run() method returns or its interrupt() method is called
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Three techniques are available for starting new threads The first is to subclass Thread and override its run() method Objects of this class can then be created and started individually The following Example1java illustrates this technique It uses a subclass of Thread called CounterThread to count to eight, printing the thread name and time for each iteration, and waiting a random length of time between iterations
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import javatext*; import javautil*; /** * A class that demonstrates simple multithreading */ public class Example1 { public static void main(String[] args) { /** * Create, name, and start two counter threads */ Thread t1 = new CounterThread(); t1setName("A"); t1start(); Thread t2 = new CounterThread(); t2setName("B"); t2start(); } } /** * A thread that counts to eight, waiting * a random length of time between iterations */ class CounterThread extends Thread { /** * Date format used in message Includes milliseconds */ public static final SimpleDateFormat FMT = new SimpleDateFormat("hh:mm:ssSSS aa"); /** * Starts the run method in a new thread */ public void start() { Systemoutprintln("Starting " + getName());
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superstart(); } /** * Where the counter loop takes place */ public void run() { for (int i = 0; i < 8; i++) { try { sleep((long) (Mathrandom() * 500 + 100)); } catch (InterruptedException e) { break; } Systemoutprintln (FMTformat(new Date()) + " Thread " + getName() + ": Count = " + i); } Systemoutprintln( Leaving + getName()); } }
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The mainline launches two CounterThread instances named A and B The following program output shows both threads execute simultaneously and occasionally overlap in their iterations:
Starting A Starting B 09:55:40465 09:55:40545 09:55:40615 09:55:40846 09:55:41056 09:55:41346 09:55:41366 09:55:41687 09:55:41717 09:55:41847 09:55:41967
PM PM PM PM PM PM PM PM PM PM PM
Thread Thread Thread Thread Thread Thread Thread Thread Thread Thread Thread
B: A: B: A: B: B: A: A: B: B: B:
Count Count Count Count Count Count Count Count Count Count Count
= = = = = = = = = = =
0 0 1 1 2 3 2 3 4 5 6
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09:55:42017 09:55:42137 Leaving B 09:55:42268 09:55:42428 09:55:42848 Leaving A
PM Thread A: Count = 4 PM Thread B: Count = 7 PM Thread A: Count = 5 PM Thread A: Count = 6 PM Thread A: Count = 7
The second technique is to have a class implement the Runnable interface In this case, the class must provide its own run() method and also create a Thread object to do the actual work The class must pass a reference to itself (using the this variable) in the Thread constructor The following Example2java shows this technique in operation Modeled closely after Example1, it creates two threads and passes each of them its this variable Note, both threads can run the same run() method simultaneously
import javatext*; import javautil*; /** * A class that demonstrates simple multithreading * using the Runnable interface */ public class Example2 implements Runnable { public static void main(String[] args) { new Example2(); } public Example2() { /** * Start two Runnable threads each using this run method */ Thread t1 = new Thread(this); t1setName("A"); t1start(); Thread t2 = new Thread(this); t2setName("B");
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