Difference between interface and abstract class

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An interface is a contract that defines a set of methods that a class must implement, while an abstract class is a class that cannot be instantiated and can contain both abstract and non-abstract methods.

An interface can only have abstract methods, while an abstract class can have both abstract and non-abstract methods.
A class can implement multiple interfaces, but can only inherit from a single abstract class.
Interfaces are used to achieve multiple inheritance in Java.
Abstract classes can have instance variables, while interfaces cannot.
Interfaces are used to define common behavior across unrelated classes, while abstract classes are used to define common behavior among related classes.

Difference between interface and abstract class

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