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Create a Thread by Implementing Runnable
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Classes and Interfaces javalangRunnable javalangThread Methods void run( ) static void sleep(long milliseconds) void start( )
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Perhaps the most common way to construct a thread is to create a class that implements Runnable and then construct a Thread using an instance of that class If you won t be overriding any of Thread s methods or extending its functionality in some way, then
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implementing Runnable is often the best approach This recipe describes the process The example also demonstrates Threadsleep( ), which suspends execution of a thread for a specified period of time
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To create a thread by implementing Runnable involves these steps: 1 Create a class that implements the Runnable interface Objects of this class can be used to create new threads of execution 2 Inside the run( ) method specified by Runnable, put the code that you want to execute in the thread 3 Create an instance of the Runnable class 4 Create a Thread object, passing in the Runnable instance 5 Begin execution of the thread by calling start( ) on the Thread instance
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As explained in Multithreading Fundamentals, Runnable specifies only one method, run( ), which is defined like this: void run( ) Inside the body of this method, put the code that you want to be executed in a separate thread The thread will continue to execute until run( ) returns To actually create a thread, pass a Runnable instance to one of Thread s constructors The one used by this recipe is shown here: Thread(Runnable thrdObj, String thrdName) Here, thrdObj is an instance of a class that implements Runnable and thrdName specifies the name of the thread To begin execution of the thread, call start( ) on the Thread instance This results in a call to run( ) on the Runnable on which the thread was constructed The example program uses Threadsleep( ) to temporarily suspend execution of a thread When a thread sleeps, another thread can execute Thus, sleeping relinquishes the CPU for the specified period of time The sleep( ) method has two forms The one used by the example is shown here: static void sleep(long milliseconds) throws InterruptedException The number of milliseconds to suspend is specified in milliseconds This method can throw an InterruptedException
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Example
The following example shows the steps needed to create and execute a thread It defines a class called MyThread that implements Runnable Inside the main( ) method of DemoRunnable, an instance of MyThread is created and passed to a Thread constructor, which creates a new thread of execution The thread is then started by calling start( ) on the new thread
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Multithreading
// Create a thread by implementing Runnable // This class implements Runnable, which means that // it can be used to create a thread of execution class MyThread implements Runnable { int count; MyThread() { count = 0; } // 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"); } } class RunnableDemo { public static void main(String args[]) { Systemoutprintln("Main thread starting"); // First, construct a MyThread object MyThread mt = new MyThread(); // Next, construct a thread from that object Thread newThrd = new Thread(mt); // Finally, start execution of the thread newThrdstart(); // Give the main thread something to do do { Systemoutprintln("In main thread"); try { Threadsleep(250); } catch(InterruptedException exc) { Systemoutprintln("Main thread interrupted"); }
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} while (mtcount != 5); Systemoutprintln("Main thread ending"); } }
Sample output is shown here (The precise output may vary, based on platform, task load, processor speed, and which version of the Java runtime system is used)
Main thread starting In main thread MyThread starting In main thread In MyThread, count is In main thread In main thread In MyThread, count is In main thread In main thread In MyThread, count is In main thread In main thread In MyThread, count is In main thread In main thread In MyThread, count is MyThread terminating Main thread ending
Let s look closely at how this program works As stated, MyThread implements Runnable This means that an object of type MyThread is suitable for use as a thread and can be passed to the Thread constructor Inside MyThread s run( ) method, a loop is established that counts from 0 to 4 This is the code that will be executed in a separate thread Inside run( ), notice the call to Threadsleep(500) This static method causes the thread from which it is called to suspend execution for the specified period of milliseconds, which is 500 milliseconds (one-half second) in this case The sleep( ) method is used to delay the execution of the loop within run( ) As a result, the message output by the loop is displayed only once each half second Inside main( ), the following sequence is used to create and start a thread:
// First, construct a MyThread object MyThread mt = new MyThread(); // Next, construct a thread from that object Thread newThrd = new Thread(mt); // Finally, start execution of the thread newThrdstart();
First, a Runnable instance is created, which is a MyThread object in this case Then, the Runnable instance is passed to the Thread constructor to create the thread Finally, the thread is started by calling start( ) Although it is possible to write this sequence in
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