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. Jan 20, 2015 · Multiple inheritance of implementations is not allowed. Components can inherit multiple interfaces, though. Inheriting multiple interfaces isn't problematic, since you're simply defining new method signatures to be implemented. 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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