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What’s the difference between an interface and an abstract class?

April 26, 2017abstract class interface

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What’s the difference between an interface and an abstract class?

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A. An abstract class may contain code in method bodies, which is not allowed in an interface. With abstract classes, you have to inherit your class from it and Java does not allow multiple inheritance. On the other hand, you can implement multiple interfaces in your class. Q3. Why would you use a synchronized block vs. synchronized method? A. Synchronized blocks place locks for shorter periods than synchronized methods.

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A. An abstract class may contain code in method bodies, which is not allowed in an interface. With abstract classes, you have to inherit your class from it and Java does not allow multiple inheritance. On the other hand, you can implement multiple interfaces in your class.