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POInheritance and Object creation, Theoretically and in Real
 

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    <p>Lets say I have a class <code>A.java</code>,</p> <p><img src="https://i.stack.imgur.com/VpU4r.png" alt="enter image description here"></p> <p>When I will execute a constructor method of A, it will create a memory space for <code>xyz</code> Object.</p> <pre><code>A xyz = new A(); </code></pre> <p>The reference to memory may be something like, </p> <pre><code>[xyz] ---&gt; '0x34524' </code></pre> <p>Thats basics of OOP. Simple enough!</p> <h3>Now,</h3> <p>What happens if a class is inheriting from different parent classes? How many object space will be created in memory?</p> <p>Lets say we have,</p> <p><img src="https://i.stack.imgur.com/saRzP.png" alt="enter image description here"></p> <p>and then we create an object of class <code>D.java</code>,</p> <pre><code>D omg = new D(); </code></pre> <p>Here as we know that D's object will call construct of C.java and so on until A.java. Does this mean that in memory we are having 4 different memory reference, because we are instantiating all of the four objects (one directly and another 3 indirectly)?</p> <pre><code>[omg] ---&gt; '0x34525' [C] ---&gt; '0x34526' [B] ---&gt; '0x34527' [A] ---&gt; '0x34528' </code></pre> <hr /> <p><strong>Note :</strong> </p> <ol> <li>This isn't homework question, this is just a curiosity question.</li> <li>I am aware of the fact that if we have a instance variable inside an A.java then we will not create only object A but we will be creating other internal object whenever we hit <code>new</code> keyword.</li> </ol>
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