Скачать или смотреть what is the use of default methods in functional interface in java 8 || Functional Interface in java

The default methods were introduced to provide backward compatibility so that existing interfaces can use the lambda expressions without implementing the methods in the implementation class. Default methods are also known as defender methods or virtual extension methods.

For example, ‘List’ or ‘Collection’ interfaces do not have ‘forEach’ method declaration. Thus, adding such method will simply break the collection framework implementations. Java 8 introduces default method so that List/Collection interface can have a default implementation of forEach method, and the class implementing these interfaces need not implement the same.

let us assume our interface implemementing so many classes, if we add one more abstarct method it will effect other classes, either those classes have to override that new added method to resolve, then default method will comes in to picture.

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