But as per Java 8 specification this difference is removed means interface can contain the method with implementation. Interface can define default and static methods with implementation code.

Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

Get a deep dive into using method references in your Java programs, including stream operations, event listeners, and constructors and factories.

Also, discovering the skeletal implementation may require a global analysis. Java 8 enhanced interfaces alleviate these problems by allowing interfaces to contain (default) method implementations, ...

When adding a static method to an interface (java 8) for using in an expression the decorator created will try to override it and calling it using the mapper interface instance given to the decorator.

While languages like Ruby provide the pertinent information you need, why can't Java provide a decent, useable, toString() method right out of the box?