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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  variable with any access specifier   interface  can  have only static final (constant) variable i.e. by default http://beginnersbook.com/2013