Web Reference: Jul 23, 2025 · Interfaces are similar to classes in that they define a set of methods that can be implemented by classes. Here's how to implement multiple inheritance using interfaces in Java. The Java programming language supports multiple inheritance of type, which is the ability of a class to implement more than one interface. An object can have multiple types: the type of its own class and the types of all the interfaces that the class implements. An interface contains variables and methods like a class but the methods in an interface are abstract by default unlike a class. Multiple inheritance by interface occurs if a class implements multiple interfaces or also if an interface itself extends multiple interfaces.
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