Java 8 introduced default methods to evolve the Java Collections Framework, so that it could support the new Streams API without breaking backward compatibility.

When default methods were introduced in Java 8, some developers thought they would be the same as abstract classes. That’s not true, however, because interfaces can’t have state.

invokedynamic was the first new Java bytecode since Java 1.0 and was crucial in implementing the "headline" features of Java 8 (such as lambdas and default methods). In this article, we take a ...