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lecture-34 - Method Overriding • In a class hierarchy...

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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 37 Method Overriding In a class hierarchy, when a method in a subclass has the same return type and signature as a method in its superclass, then the method in the subclass is said to override the method in the superclass.
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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 38 Method Overriding When an overridden method is called from within a subclass, it will always refer the version defined by the subclass.
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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 39
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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 40
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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 41 Method Overriding Method overriding occurs only when the return types and signatures of the two methods are identical. If they are not, then the two methods are simply overloaded.
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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 42
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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 43 Overridden Methods and Polymorphism Method overriding forms the basis for one of Java’s most powerful concepts: dynamic method dispatch . Dynamic method dispatch is the mechanism by which a call to an overridden method is resolved at run time rather than compile time.
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Object Oriented Programming Java - Inheritance and Polymorphism Winter 2006 R.B. Lenin DA-IICT 44
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