![]() ![]() sleep(int m )/sleep(int m ,int n ) The thread sleeps for m milliseconds plus n nanoseconds. ![]() If it is suspended, it does not die until it starts running again. Currently, the thread does not stop unless it is running. stop() This method stops and kills a running thread.It has no effect on a thread that is not suspended. resume() This method resumes the execution of a suspended thread.It remains suspended until resume() is called. suspend() This method suspends the execution of the thread.It starts executing in the run() method of its Runnable target that was set when the constructor was called. start() This method starts the thread.Some of the methods that control the thread execution are the following: Some of them (like destroy()) don't seem to have been implemented yet, and may never be. There are many methods in the Thread class. The thread will start executing in the run() method of the Runnable parameter when Thread.start() has been called. Runnable The Runnable parameter is an object that has implemented the Runnable interface.A ThreadGroup can be used to organize a thread. ThreadGroup The new thread will belong to the group specified by the parameter ThreadGroup.A thread can get its name by calling Thread.getName(). String The name of the new thread is the parameter String.The constructors can use three possible parameters: Thread() Thread(Runnable) Thread(ThreadGroup) Thread(String) Thread(ThreadGroup,String) Thread(Runnable,String) Thread(ThreadGroup,Runnable,String) When Thread.start() is called, the new thread starts running in the run() method of an object. The thread does not start running until Thread.start() is called. Examples of both approaches are in this chapter. But if the thread is going to be running in its own class, it may be more convenient to extend the Thread class. The interface approach must me used if the thread is to actually start in the applet class. Both extending the Thread class and implementing the Runnable interface have the same functionality. There isn't much difference between the two approaches. An applet with the Runnable interface must have a run() method for the thread to start. The applet cannot inherit from both the Thread and Applet classes. If a thread is to start running in the applet, it must use the Runnable interface. It is not necessary to define a new class to run the thread. This technique is probably more common than extending the Thread class. The thread can start running in the class's run method. With this technique the new class inherits from the class Thread. A new Thread class always starts running the public void run() method of a class. When Thread.start() is called, the thread begins executing in the run() method of the target class. Thread.start() must be called to actually make the thread run. However, the thread does not start running right away. To create a thread, a new instance of this class must be created. The class is used to create and control threads. One thread controls an animation, while another does a computation. Threads are used to do more than one thing at once. If the user clicks the mouse, a new thread is created to render a new frame in an image. A thread displays a frame, sleeps for a while, and then repeats the process. Every few milliseconds a new frame is shown. A common example of this is found in animations. Threads are used to do tasks that happen repetitively. A thread is used so that the system thread can handle other events. The applet may need to do something like wait for an image to be loaded. Threads are used in applets that may take a while to initialize. Some specific uses for threads are listed below: If an applet needs to do something that will take some time in one of its methods, it should start a new thread. If the applet holds theses threads too long, it locks up the browser. While the threads are running in the applet methods, they cannot do anything else. The underlying thread calls the appropriate thread in the applet. When there is a mouse click, or a repaint() has been called. These threads are created by the Web browser. The applet methods start(), paint(), and so on are all called by underlying threads. Two threads running through three classes. Figure 16.1 shows threads, constructors, and methods in a typical applet.įigure 16.1. Methods and constructors reside in the computer's memory. The threads go into the methods and follow their instructions. The methods and constructors themselves are lifeless. A thread also creates a new thread or kills an existing one. Some threads can run for the entire life of the applet, while others are alive for only a few milliseconds. Every line of code that is executed is done so by a thread. A Solution to the Dining Philosophers ProblemĪ thread executes a series of instructions.When Are The Methods in InfiniteThreadExample Called?. ![]()
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