StackOverflow2013

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18201828
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2013-08-13T06:09:02.717
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2013-08-13T06:15:54.730
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2017-05-23T11:56:38.037
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1065197
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18201661
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text
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<blockquote> when i run this code display method of derived class is being called </blockquote> Looks like you have programmed in other programming languages like C++ or C# where you must specify the method as <code>virtual</code> in order to use the subclass method. In Java, all the methods except <code>private</code>, <code>final</code> and <code>static</code> are virtual. Knowing this, since <code>Child</code> class already overrides <code>display</code> method from <code>Parent</code> class, when you do this: <pre><code>Parent a1 = new Child(); a1.display(); </code></pre> <code>a1.display</code> will execute the <code>display</code> method of the actual object reference class, in this case, <code>Child#display</code>. In order to fix the code, change the initialization of <code>a1</code> to be a new <code>Parent</code>: <pre><code>Parent a1 = new Parent(); a1.display(); </code></pre> More info: <ul> <li><a href="https://stackoverflow.com/q/4547453/1065197">Can you write virtual functions / methods in Java?</a></li> </ul> <hr> After your edit, now you face the problem when printing <code>a1</code> in the console, probably printing <code>9</code> instead of <code>8</code>. What you're doing here is hiding the field. Fields do not get overridden, so the value of the <code>i</code> variable will depend on the actual class type declared for the variable. Since you have declared <code>a1</code> as <code>Parent</code>, then <code>a1.i</code> will take the value of <code>Parent#i</code>. In order to fix this code, change the <code>a1</code> variable type to <code>Child</code>: <pre><code>Child a1 = new Child(); System.out.println(a1.i); a1.display(); </code></pre> Or a even better solution: NEVER try to override a field, and what's worse, don't try to access to class fields from other classes directly, instead use the respective getters and setters. More info: <ul> <li><a href="http://docs.oracle.com/javase/tutorial/java/IandI/hidevariables.html" rel="nofollow noreferrer">Hiding fields</a></li> </ul> <hr> <blockquote> How to access methods of ancestor class when intermediate parent class overrides it? </blockquote> Assuming this is your real question, then the answer is simple: you can't.
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