Difference between abstract vs interface vs concrete class

abstract vs interface vs concrete class:
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1.Abstract:
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==>abstract class talks about implementation but not completely.

==>It contains some implemented methods and some abstract methods.

==>We cannot create object for abstract classes.

==>We can execute the constructor for abstract classes through their child classes.

2.interface:
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==>Interface only contains abstract methods i.e it never talks about implementation.

==>It is fully abstract.

==>We cannot create object for interfaces and we cannot execute constructor for interfaces.

3.concrete class:
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==>Concrete class completely talks about implementations.

==>It is ready to provide service.

==>We can create object for concrete classes.


==>We can execute the constructors as well.