The main purpose of abstraction is hiding the unnecessary details from the users . Abstraction is selecting data from a larger pool to show only relevant details of the object to the user. It helps in reducing programming complexity and efforts.
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Abstract classes are used to express broad concepts from which more concrete classes can be derived . An abstract class type object cannot be created. To abstract class types, however, you can use pointers and references.
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The purpose of an abstract class is to provide an appropriate base class from which other classes can inherit .
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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.
Read moreWhy do we use abstract methods in C#?
The abstract modifier can be used with classes, methods, properties, indexers, and events. Use the abstract modifier in a class declaration to indicate that a class is intended only to be a base class of other classes, not instantiated on its own .
Read moreWhat is a abstract method?
An abstract method is a method that is declared without an implementation (without braces, and followed by a semicolon), like this: abstract void moveTo(double deltaX, double deltaY);
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