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.

Follow these five guidelines when you include Java's default constructor in your code: A default constructor exists only when no other constructors exist in the class. The default constructor takes no ...

The java.util.function.Consumer class has one non-default method named accept which takes a single object as its argument and has a void return type. java.util.function.Consumer<T> Consumer function ...