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18939887
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2013-09-22T03:09:22.217
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2013-09-22T03:09:22.217
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18939597
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I've prepared a simple test app. <pre><code>public class TEST { static abstract class Flight { String type = "Flight"; abstract String getDirection(); public String getType() { return this.type; } public void schedule() { System.out.printf("Scheduled a %s towards %s",this.getType(),this.getDirection()); System.out.println(); System.out.printf("ReadyToGo: %s",this.isReadyToGo()); } public boolean isReadyToGo() { return false; } } static class SouthWestFlight extends Flight { String type = "SouthWestFlight"; @Override String getDirection() { return "SouthWest"; } @Override public boolean isReadyToGo() { return true; } } public static void main(String... args) { new SouthWestFlight().schedule(); } } </code></pre> Output: Scheduled a Flight towards SouthWest ReadyToGo: true Conclusions Here the <code>SouthWestFlight</code> object is still a <code>Flight</code> Object. But when you extend a class the child class overrides all the methods of parent class. That is why <code>isReadyToGo()</code> of SouthWestFlight() returned true. None of the properties are overriden. That is why <code>this.getType()</code> returns <code>Flight</code>. But if you override the <code>getType()</code> method with a new method in <code>SouthWestFlight</code> like this: <pre><code>@Override public String getType() { return this.type; } </code></pre> It will return <code>type</code> field of <code>SouthWestFlight</code>. Wondering why? It is because, the first <code>getType()</code> method is defined in parent <code>class Flight</code>. So it returns <code>type</code> field of <code>class Flight</code>. The second <code>getType()</code> method is defined in <code>SouthWestFlight</code> so it returns <code>type</code> field of <code>SouthWestFlight</code>. Hope you've got it clear. Please comment if you found any mistake or got any doubt.
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1. POIn an abstract class does the "this" keyword refrerence the parent or child class?
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