1/19/2024 0 Comments Default methods in java interface![]() ![]() If we add a new method to an interface, all the existing concrete implementations will break and fail to compile. Or, a class might inherit the implementation of an interface from a superclass.Īdding a new method to an interface is a backward-incompatible or a breaking change before Java 8. The class that is implementing the interface must provide an implementation for all the methods in the interface. Those are abstract (just the method name, parameter names and types and the return type. In Java, an interface is a contract that has methods declared in it. – A default method that can break the contract Throwing an exception as a default implementation.Default method implementations need not always be the great.Interfaces before Java 8 – Set in stone?.This concludes the tutorial on default methods where we understood what are default methods, how we implement default methods in Java 8 interfaces, what kind of a basic design extensibility default methods solve,had a look at making default methods optional and lastly saw that default methods enable multiple inheritance in Java. Multiple inheritance in Java 8 using default methods is a topic on its own and I have written a separate tutorial on it here - multiple inheritance tutorial Click to Read Tutorial on Multiple Inheritance in Java 8. Then this becomes an instance of multiple inheritance which was till Java 7 not possible in Java while it was possible in languages such as C++. A default method written in the above way thus becomes optional.Ī class can implement multiple interfaces and each of these interfaces can have default methods. ![]()
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