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Abstract Class in Java





An abstract class is declared with the abstract keyword. Unlike a regular java class, an abstract class may not only contain the regular methods, defined with curly braces { } but may also contain the abstract methods, ending with a semicolon; or a mix of regular and abstract methods.






What are abstract methods?


Abstract methods are not implemented in the abstract class and are declared with -: Please remember, the internal logic of an abstract method is not provided, which means that an abstract method is not defined within a pair of curly braces {} and it ends with a semicolon ;






An example of an abstract method -
abstract public void add();

We have declared a method add with an abstract keyword, which makes it an abstract method. This method has a public access modifier and a void return-type, which means that this abstract method will not return any value. And as it should be, this abstract method ends with a semicolon ;

Note : An abstract method should never be declared with a private access modifier because doing so will make this abstract method inaccessible to the concrete class that extends the abstract class and wants to provide an implementation of its abstract method.


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Some very important points about an abstract class.



interface A
{
void a();
void a_show();
}

abstract class B implements A
{
}

An abstract class has implemented an interface without implementing any of the methods of an interface.



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