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The javalangRunnable interface abstracts a unit of executable code You can construct a thread on any object that implements the Runnable interface Therefore, any class that you intend to run in a separate thread must implement Runnable Runnable defines only one method called run( ), which is declared like this: void run( ) Inside run( ), you will define the code that constitutes the new thread It is important to understand that run( ) can call other methods, use other classes, and declare variables just like the main thread The only difference is that run( ) establishes the entry point for another, concurrent thread of execution within your program This thread will end when run( ) returns Once you have created an instance of a class that implements Runnable, you create a thread by constructing an object of type Thread, passing in the Runnable instance To start the thread running, you will call start( ) on the Thread object, as described in the next section
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The Thread Class
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The Thread class encapsulates a thread It is packaged in javalang and implements the Runnable interface Therefore, a second way to create a thread is to extend Thread and override the run( ) method Thread also defines several methods that help manage threads Here are the ones used in this chapter:
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Method static Thread currentThread( ) long getID( ) final String getName( ) final int getPriority( ) ThreadState getState( ) static boolean holdsLock(Object obj) void interrupt( ) static boolean interrupted( ) final boolean isAlive( ) final boolean isDaemon( ) boolean isInterrupted( ) final void join( ) void run( ) final void setDaemon(boolean how) final void setName(String thrdName) final void setPriority(int level) static void sleep(long milliseconds) void start( ) static void yield( ) Meaning Returns a reference to a Thread object that represents the invoking thread Returns a thread s ID Obtains a thread s name Obtains a thread s priority Returns the current state of the thread Returns true if the invoking thread holds the lock on obj Interrupts a thread Returns true if the invoking thread has been interrupted Determines whether a thread is still running Returns true if the invoking thread is a daemon thread Returns true if the thread on which it is called has been interrupted Waits for a thread to terminate Entry point for the thread If how is true, the invoking thread is set to daemon status Sets a thread s name to thrdName Sets a thread s priority to level Suspends a thread for a specified period of milliseconds Starts a thread by calling its run( ) method Yields the CPU to another thread
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Pay special attention to the start( ) method After an instance of Thread has been created, call start( ) to begin execution of the thread The start( ) method calls run( ), which is the method defined by Runnable that contains the code to be executed in the thread This process is described in detail in the following recipes Another method of special interest is sleep( ) It suspends execution of a thread for a specified period of time When a thread sleeps, another thread can execute until the sleeping thread awakes and resumes execution Several examples in this chapter use sleep( ) to demonstrate the effects of multiple threads
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Thread defines two sets of constructors, one for constructing a thread on a separate instance of Runnable and the other for constructing a thread on classes that extend Thread Here are the constructors that take a separate instance of Runnable: Thread(Runnable thrdOb) Thread(Runnable thrdOb, String thrdName) Thread(ThreadGroup thrdGroup, Runnable thrdObj) Thread(ThreadGroup thrdGroup, Runnable thrdObj, String thrdName) Here, thrdObj is a reference to an instance of a class that implements Runnable This object s run( ) method contains the code that will be executed as the new thread The name of thread is passed in thrdName If no name is specified (or the name is null), then a name is supplied automatically by the JVM The thread group to which the thread belongs (if any) is passed via thrdGroup If the thread group is not specified, then the thread group is determined by the security manager (if there is one) or is set to the same group as the invoking thread Here are the constructors that create a thread for classes that extend Thread: Thread( ) Thread(String thrdName) Thread(ThreadGroup thrdGroup, String thrdName) The first constructor creates a thread that uses the default name and thread group, as described already The second lets you specify the name The third lets you specify the thread group and the name For both sets of constructors, the thread will be created as a user thread unless the creating thread is a daemon thread In this case, the thread will be created as a daemon thread There is another Thread constructor that lets you specify a stack size for the thread However, because of differences in execution environments, the API documentation states that extreme care should be exercised in its use Therefore, it is not used in this book
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