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By Scott Oaks; Henry Wong

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After its start() method has been called, the new thread is said to be alive. In fact, the Thread class has anisAlive() method that tells you the state of the thread: if the isAlive() method returns true, the thread has been started and is executing itsrun() method. If the isAlive( ) method returns false, however, the thread may not be started yet or may be terminated. com to register . it. 3 Terminating a Thread Once started, a thread executes only one method: the run() method. The run() method may be very complicated, it may execute forever, and it may call millions of other methods.

Here the data to be sent to the clients is the same; you don't want each client to require a separate server process which must then replicate all the data held by every other server process. Instead, you want multiple threads in one program so that they may share data and each perform discrete tasks on that data. That type of sharing is shown in Figure 2-2. Figure 2-2. com to register it. Thanks. Conceptually, the threads seem to be the same as programs. The key difference here is that the global memory is the entire Java heap: threads can transparently share access between any object in the heap.

Your Java application is highly threaded, whether you program additional threads into it or not. Returning to our example, let's suppose that we wrote a program that performed two tasks: one calculated the factorial of a number and one calculated the square root of that number. These are two separate tasks, and so you could choose to write them as two separate threads. Now how would your application run? The answer to that depends on the conditions under which the application is run. The Java virtual machine now has two distinct lists of instructions to execute.

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