Difference between Abstract class and interface
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Unlike interfaces,abstract classes can contain fields that are not static and final, and they can contain
implemented methods. Such abstract classes are similar to interfaces, except that they provide a partial
implementation, leaving it to subclasses to complete the implementation. If an abstract class containsonly abstract
method declarations, it should be declared as an interface instead.
Multiple interfaces can be implemented by classes anywhere in the class hierarchy, whether or not they are
related to one another in any way. Think of Comparable or Cloneable, for example.
By comparison, abstract classes are most commonly subclassed to share pieces of implementation. A single
abstract class is subclassed by similar classes that have a lot in common (the implemented parts of the abstract
class), but also have some differences (the abstract methods).
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