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copied!<p>I think you either did something wrong when you copied the code into SO or you're not placing the trace statements correctly. You need to place the <code>trace("This is TestOne");</code> inside a constructor in TestOne.as, like this: </p> <pre><code>public function TestOne() { trace("This is TestOne"); } </code></pre> <p>The same goes for the code inside the Init class, which now reads:</p> <pre><code>trace("This is Main Class"); var testOne : TestOne = new TestOne; </code></pre> <p>but should be(note the bracers after new TestOne):</p> <pre><code>public function Init() { trace("This is Main Class"); var testOne : TestOne = new TestOne(); } </code></pre> <p>What happens when you run your SWF, is that the constructor of the class <code>Init</code> will:</p> <p>1) Trace "This is Main Class" to your console.</p> <p>2) It will construct a new object(thus the name constructor) by calling the constructor of the class <code>TestOne</code>.</p> <p>If you were to add this line to the end of the constructor in the class <code>Init</code>:</p> <pre><code>testOne.testing(); </code></pre> <p>you should see this in the console: "This is the testing method".</p> <p>If you would now comment out the line: <code>var testOne : TestOne = new TestOne();</code> and run the SWF again, you'll get an error telling you something is null. This is because you attempt to call the method <code>testing</code> on an object that does not exist.</p> <p>I do realize this is primarily fixing some coding errors of yours, and not so much helping you understand OOP. But hopefully you can pick up some help regarding object construction. I see some answers already mention key OOP principle that you really should look into.</p> <p>Edit:</p> <p>Remember that duplicating code is never a good thing, so if you find that all of the classes TestOne - TestFive contain the same code, except for some minor detail. You should probably change them into one class.</p> <p>In your case you could for example change TestOne so that the constructor accepts a <code>String</code>, and then in your <code>testing</code> function you could just trace that <code>String</code>. By changing your TestOne class into the following you effectively get rid of 4 other classes. You also encapsulate a <code>String</code> inside of the class TestOne. </p> <pre><code>package classes { import flash.display.MovieClip; public class TestOne extends MovieClip { private var message : String; public function TestOne(myMessage:String) { message = myMessage; trace("This is TestOne"); } public function testing() : String { return message; } } } </code></pre>

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