[PDF] Cours 7 : Classes et méthodes abstraites - Loria
Java Classes et méthodes abstraites ▫ Exemple public abstract class Dés qu'une classe comporte une méthode abstraite, elle est abstraite, et ce même si
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AbstractCollection class in java libraries Account example below Abstract Method The "abstract" keyword can be added to a method e g public abstract void
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The class containing an abstract method MUST be qualified as Java does not support multiple inheritance Defines a set of abstract methods (prototypes)
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o class containing abstract methods o cannot create instances, i e , objects, with the new operator Listing 11 1 GeometricObject java public abstract class
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Subclasses must implement all abstract methods, or must also be abstract classes • Why make a method abstract? – Provide some default behaviors in concrete
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Overrid den methods are generally omitted in the UML diagram for subclasses GeometricObject java Circle java Rectangle java abstract method in abstract
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It needs to be extended and its method implemented It cannot be instantiated A method that is declared as abstract and does not have implementation is known
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Java has this rule because it wants to be sure that the method exists at runtime It wouldn't exist at runtime if some subclass of Shape didn't declare area(), and
[PDF] Abstract class The abstract modifier indicates that the thing being
An abstract method is implicitly a virtual method Abstract method declarations are only permitted in abstract classes method body; the method declaration
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