Java 8 introduced the new concept of default method implementation in interfaces. This feature was added for backward compatibility so that legacy interfaces can be used to take advantage of Java 8's lambda expression functionality.
For example, the "List" or "Collection" interface does not have a "forEach" method declaration. Therefore, adding such a method will only break the collection framework's implementation. Java 8 introduced default methods so that the List/Collection interface can have a default implementation of the forEach method, and classes that implement these interfaces do not need to implement the same method.
Starting with Java 8, interfaces can also have static helper methods
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