Explanation:As explained earlier in Section 12.22, the isAlive method returns true if thread on which
it is called isalive. Initially, after starting all the three methods, calling isAlive method on all the
threads result in true value from isAlivemethod. Then the main thread sleeps for 3 seconds. Next, when
the isAlive method is called on the threads again, it returns false as the threads have done their execution
and have terminated.
12.2.3 Implementing Thread Using Runnable
When thread methods are needed to be used, Runnable interface can be made use of for implementing
threads in the programs. ...
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