How do abstract classes differ from interfaces?
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Answer / Deepali Sharma
An abstract class is a class that cannot be instantiated and is intended to be subclassed. It provides a general blueprint for a set of methods, but some or all of the methods may be unimplemented. An interface in Delphi defines a contract of what a class should do, without providing any implementation. A class implementing an interface must provide implementations for all the methods defined in the interface.
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