To create an abstract class, just use the abstract keyword before the class keyword, in the class declaration. You can observe that except abstract methods the Employee class is same as normal class in Java. The class is now abstract, but it still has three fields, seven methods , and one constructor.
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The Purpose of Abstract Classes. The purpose of abstract classes is to function as base classes which can be extended by subclasses to create a full implementation . For instance, imagine that a certain process requires 3 steps: The step before the action.
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ABSTRACT METHOD in Java, is a method that has just the method definition but does not contain implementation . A method without a body is known as an Abstract Method. It must be declared in an abstract class. The abstract method will never be final because the abstract class must implement all the abstract methods.
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To declare an abstract method, use this general form: abstract type method-name(parameter-list); As you can see, no method body is present. Any concrete class(i.e. class without abstract keyword) that extends an abstract class must override all the abstract methods of the class.
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Observation 3: In Java, we can have an abstract class without any abstract method . This allows us to create classes that cannot be instantiated but can only be inherited.9 Ara 2021
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It’s not necessary for an abstract class to have abstract method . We can mark a class as abstract even if it doesn’t declare any abstract methods. If abstract class doesn’t have any method implementation, its better to use interface because java doesn’t support multiple class inheritance.
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An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
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