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CHAPTER 10 Multithreading
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this reference to call the start() method Remember that the start() method calls the run() method Next, we define the run() method Statements within the run() method become the portion of the program that executes when the thread executes There are only two displayed statements in the run() method Later in this chapter, we ll expand the run() method to include more interesting statements Next, we define the program class The program class explicitly executes the new thread by creating an instance of the MyThread class This is done by using the new operator and calling the constructor of MyThread Finally, the program finishes by displaying two lines on the screen
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Creating a Thread by Using extends
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You can inherit the Thread class as another way to create a thread in your program As you ll recall from 8, you can cause your class to inherit another class by using the keyword extends when defining your class When you declare an instance of your class, you ll also have access to members of the Thread class Whenever your class inherits the Thread class, you must override the run() method, which is an entry into the new thread The following example shows how to inherit the Thread class and how to override the run() method This example defines the MyThread class, which inherits the Thread class The constructor of the MyThread class calls the constructor of the Thread class by using the super keyword and passes it the name of the new thread, which is My thread It then calls the start() method to activate the new thread The start() method calls the run() method of the MyThread class As you ll notice in this example, the run() method is overridden by displaying two lines on the screen that indicate that the child thread started and terminated Remember that statements within the run() method constitute the portion of the program that runs as the thread Therefore, your program will likely have more meaningful statements within the definition of the run() method than those used in this example The new thread is declared within the main() method of the Demo class, which is the program class of the application After the thread starts, two messages are displayed, indicating the status of the main thread
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class MyThread extends Thread { MyThread(){ super("My thread"); start(); }
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public void run() { Systemoutprintln("Child thread started"); Systemoutprintln("Child thread terminated"); } } class Demo { public static void main (String args[]){ new MyThread(); Systemoutprintln("Main thread started"); Systemoutprintln("Main thread terminated"); } }
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As a rule of thumb, you should implement the Runnable interface if the run() method is the only method of the Thread class that you need to override You should inherit the Thread class if you need to override other methods defined in the Thread class
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It is not unusual to need to run multiple instances of a thread, such as when your program prints multiple documents concurrently Programmers call this spawning a thread You can spawn any number of threads you need by first defining your own class that either implements the Runnable interface or inherits the Thread class and then declaring instances of the class Each instance is a new thread Let s see how this is done The next example defines a class called MyThread that implements the Runnable interface The constructor of the MyThread class accepts one parameter, which is a string that is used as the name of the new thread We create the new thread within the constructor by calling the constructor of the Thread class and passing it a reference to the object that is defining the thread and the name of the thread Remember that the this keyword is a reference to the current object The start() method is then called, which calls the run() method The run() method is overridden in the MyThread class Two things happen when the run() method executes First, the name of the thread is displayed on the screen Second, the thread pauses for 2 seconds when the sleep() method is called The sleep() method is defined in the Thread class can accept one or two parameters The first parameter is the number of milliseconds the thread is to pause The
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