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The following example shows how to create a thread by extending Thread It is functionally equivalent to the example in the previous recipe
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// Create a thread by extending Thread // This class extends Thread Constructing an // instance of this class creates a thread of execution class MyThread extends Thread { int count; MyThread() { count = 0; } // Override the run( ) method public void run() { Systemoutprintln("MyThread starting"); try { do { Threadsleep(500); Systemoutprintln("In MyThread, count is " + count); count++; } while(count < 5); } catch(InterruptedException exc) { Systemoutprintln("MyThread interrupted"); }
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Systemoutprintln("MyThread terminating"); } } class ExtendThreadDemo { public static void main(String args[]) { Systemoutprintln("Main thread starting"); // Construct a MyThread object Because MyThread // extends Thread, this creates a new thread MyThread mt = new MyThread(); // Start execution of the thread mtstart(); // Give the main thread something to do do { Systemoutprintln("In main thread"); try { Threadsleep(250); } catch(InterruptedException exc) { Systemoutprintln("Main thread interrupted"); } } while (mtcount != 5); Systemoutprintln("Main thread ending"); } }
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The output is the same as shown in the previous recipe
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When extending Thread, you may want to invoke a Thread constructor from within the constructor of your thread class For example, if you want to give a name to the thread, then you will need to invoke this version of Thread s constructor: Thread(String thrdName) Of course, this is accomplished via a call to super For example, this version of MyThread( ) gives the thread the name Alpha
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MyThread() { super("Alpha"); count = 0; }
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See Use a Thread's Name and ID for information on thread names Since it is possible to create a thread by implementing Runnable in a separate class, or by extending Thread, a question naturally arises: which is the better approach Although there is no hard and fast rule to this effect, many programmers believe that classes should be extended only when they are being expanded or changed in some way Therefore, often
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7:
Multithreading
Thread is extended only when there is a reason to do so (for example, if you are providing a custom implementation of start( )) Otherwise, it usually makes more sense to simply implement Runnable
Use a Thread s Name and ID
Key Ingredients
Classes javalangThread Methods long getId( ) final String getName( ) final void setName(String thrdName)
All threads have a name This name is either created by the runtime system or specified by you when a thread is created Although released code won t always make use of a thread s name, thread names are very helpful when developing, testing, and debugging Although a thread name can be used to identify a thread, doing so has two drawbacks First, thread names are not necessarily unique More than one thread can have the same name Second, because thread names are strings, comparing a name involves a string comparison, which is costly in terms of time To avoid these problems, you can use another mechanism to identify a thread Beginning with Java 5, all threads are given a thread ID, which is a long integer value Thread IDs are unique, and because they are integers, comparisons are very fast Thus, you can efficiently identify a thread through its ID This recipe shows how to use both thread names and IDs
NOTE Remember that thread IDs were added by Java 5 Thus, thread IDs are available only if you
are using a modern version of Java
Step-by-Step
To use thread names and IDs involves the following steps: 1 There are two ways to give a thread a name First, and most convenient, you can specify its name when constructing a thread by passing it to one of Thread s constructors Second, you can change a thread s name by calling setName( ) 2 You can obtain a thread s name by calling getName( ) 3 Beginning with Java 5, threads are automatically given ID numbers when they are created These numbers cannot be set by your program, but you can obtain the ID by calling getID( )
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