1 on 1 web hosting - Chapter 15 Multithreading 877 The constructor public Thread(
Chapter 15 Multithreading 877 The constructor public Thread( ThreadGroup threadGroup, Runnable runnableObject ) constructs a Thread that belongs to threadGroup and that invokes the run method of runnableObject when the thread is assigned a processor to begin execution. The constructor public Thread( ThreadGroup threadGroup, Runnable runnableObject, String stringName ) constructs a Thread that belongs to threadGroup and that invokes the run method of runnableObject when the thread is assigned a processor to begin execution. The name of this Thread is indicated by stringName. Class ThreadGroup contains many methods for processing groups of threads. Some of these methods are summarized here. For more information on these methods, see the Java API documentation. 1. Method activeCount reports the number of active threads in a thread group plus the number of active threads in all its child thread groups. 2. Method enumerate has four versions. Two versions copy into an array of Thread references the active threads in the ThreadGroup (one of these also allows you to recursively get copies of all the active threads in child Thread- Group). Two versions copy into an array of ThreadGroup references the active child thread groups in the ThreadGroup (one of these also allows you to recursively get copies of all the active thread groups in all the child Thread- Groups). 3. Method getMaxPriority returns the maximum priority of a ThreadGroup. Method setMaxPrioritysets a new maximum priority for a ThreadGroup. 4. Method getName returns as a Stringthe ThreadGroup s name. 5. Method getParent determines the parent of a thread group. 6. Method parentOf returns true if the ThreadGroup to which the message is sent is the parent of, or the same as, the ThreadGroup supplied as an argument and returns false otherwise. Testing and Debugging Tip 15.5 Method list lists the ThreadGroup. This can help in debugging. 15.12 (Optional Case Study) Thinking About Objects: Multithreading Real-world objects perform their operations independently of one another and concurrently (in parallel). As you learned in this chapter, Java is a multithreaded programming language that facilitates the implementation of concurrent activities. The UML also contains support for designing concurrent models, as we will see shortly. In this section, we discuss how our simulation benefits from multithreading.
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