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copied!<blockquote> <p>Is a sub class of an interface also an interface?</p> </blockquote> <p>There is no such thing as a subclass of an interface. You can <code>extend</code> an interface with another interface, or you can <code>implement</code> an interface with a class.</p> <blockquote> <p>Is a class implementing Runnable Interface also an interface?</p> </blockquote> <p>No - it's a class. An interface is defined with <code>interface</code>, not <code>class</code>.</p> <blockquote> <p>Can't methods/functions be called Operations of a class?</p> </blockquote> <p>Sure - method/function/operation - sounds like reasonable synonyms to me. Internally, Java calls them Methods (see <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/reflect/Method.html" rel="nofollow">reflection related javadoc</a>)</p> <blockquote> <p>Are global variables the only attributes of a class or local variables within a function can also be called so?</p> </blockquote> <p>I assume you're referring to class attributes as the objects/primitives owned by a class instance - in your first example, this would be <code>myID</code> in the <code>SomeThread</code> class. Local variables within a method are only accessible within that method (for example, <code>i</code> in your <code>run</code> method in the same class), and are not class attributes.</p> <blockquote> <p>In the 2nd Program the author is sending an object to the Thread constructor. Is it correct?</p> </blockquote> <p>Yes; <code>new SomeThread2(3)</code> returns an instance of <code>SomeThread</code>, which is also an object.</p> <blockquote> <p>Can someone body please draw the UML for the two programs?</p> </blockquote> <p>Not likely. This sounds too much like homework.</p>

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