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abstract Classes Interfaces abstract class can extend only one class or one abstract class at a time    interface can extend any number of interfaces at a time abstract  class  can extend from a class or from an abstract class     interface   can extend only from an interface abstract  class  can  have  both  abstract and concrete methods   interface can  have only abstract methods  A class can extend only one abstract class A class can implement any number of interfaces In abstract class keyword ‘abstract’ is mandatory to declare a method as an abstract   In an interface   keyword   ‘abstract’ is optional to declare a method as an abstract abstract  class can have  protected , public and public abstract methods   Interface can have only public abstract methods i.e. by default abstract class can have  static, final  or static final  variab...