One can implement threads in two ways
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Firstly subclassing the Thread class and overriding its run() method
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Secondly by creating a Thread with a Runnable object (i. e. that implements Runnable interface)
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Only the second way is possible for applets as these already extend Applet class and so cannot multiply inherit from the Thread class
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Threads must have a run method which is code Thread executes.
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If you are using first way, this is written for this particular thread and overrides run() in Thread class
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In second way, the created Thread automatically takes its run() method to be the run method of the applet
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