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Multithreading
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different or more compact ways (see Options and Alternatives), all threads based on a separate Runnable will construct and start a thread using the same general approach After creating and starting MyThread, main( ) enters a loop that also contains a call to sleep( ) In this case, it sleeps for only 250 milliseconds Therefore, the loop in main( ) will iterate twice for each iteration of the loop in MyThread, as the output confirms
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The preceding example is designed to clearly show each step in the thread creation/ execution process Therefore, each step is handled individually First, a MyThread object is created Next, a Thread is created using this object Finally, the thread is started by calling start( ) However, it is possible to streamline this process by combining these three steps so that when a MyThread object is created, it is automatically passed to Thread( ), and then the thread is started To do this, create the Thread instance within the MyThread constructor, and then call start( ) on the thread This approach is shown here:
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// Streamlining the creation of a thread // This class implements Runnable Its constructor // automatically creates a Thread object by passing // this instance of MyThread to Thread The thread // is then started by calling start() Therefore, // the thread begins execution as soon as a MyThread // object is created class MyThread implements Runnable { int count; MyThread() { count = 0; // Create the thread and start its execution new Thread(this)start(); } // Entry point of thread 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"); } Systemoutprintln("MyThread terminating"); } }
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class RunnableDemo { public static void main(String args[]) { Systemoutprintln("Main thread starting"); // Construct and start running a MyThread object MyThread mt = new MyThread(); // 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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This program produces the same output as the previous version The sleep( ) method also has a second form, which allows you to specify the delay period in terms of milliseconds and nanoseconds It is shown here: static void sleep(long milliseconds, int nanoseconds) Of course, this version of sleep( ) is useful only if you need nanosecond precision Another way to create a thread is to extend Thread This approach is shown in the next recipe
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Classes javalangThread Methods void run( ) static void sleep(long milliseconds) void start( )
Instead of creating a separate class that implements Runnable, you can extend Thread to create a thread This works because Thread implements the Runnable interface You simply override the run( ) method, adding the code that will be executed by the thread This recipe shows the process
7:
Multithreading
Step-by-Step
To create a thread by extending Thread involves these steps: 1 Create a class that extends Thread 2 Override the run( ) method, specifying the code that you want to execute in a thread 3 Create an instance of the class that extends Thread 4 Begin execution of the thread by calling start( ) on that instance
Discussion
When you create a thread by extending Thread, you must override the run( ) method, which is specified by the Runnable interface Inside run( ), put the code that you want executed by the thread The thread will end when run( ) returns Next, construct an object of the class that extends Thread This creates a new thread To start the thread, call start( ) The call to start( ) results in the overridden run( ) method being invoked
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