Ever since Java 8 introduced default and static methods in JDK 8, it's become possible to define non-abstract methods in interfaces. Since Java, one class can implement multiple interfaces and because there can be concrete methods in interfaces, the diamond problem has surfaced again. What will happen if two interfaces have methods o the same name and a Java class inherit from it? Many Java programmer also asks me the question that, is Java 8 is also supporting multiple inheritances of classes? Well, it's not but the doubt is genuine because the interface with methods is similar to an abstract class or in that any Class in Java.
What is Default or Defender Methods in Java 8? Tutorial Example
Whenever someone talks about Java 8, the first thing they speak about is lambda expression and how lambda expression has changed the way you use Collections API today. In truth, lambda expression would not be that useful had language not been enhanced to support default methods on Java Interface. Also known as virtual extension or defender methods, they allow you to declare a non-abstract method inside the Java interface. This means, finally you can add new methods without breaking all classes, which implements a certain interface. This opens a new path for enhancing and evolving the existing Collection API to take advantage of lambda expressions. For example, now you can iterate over all elements of Collection in just one line, as opposed to four lines it requires you to do prior to Java 8.
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