Brian Goetz, from Oracle, has posted an updated proposal for the lambda expressions : State of the Lambda
Here are some examples of closures taken from the proposal :
We can use lambda expressions to replace the heavy usage of Single Abstract Method (SAM) interfaces :
public interface CallbackHandler {
public void callback(Context c);
}
CallbackHandler cb = { c -> System.out.println("pippo") };We can make references to methods to use it as SAM interfaces :
class Person {
private final String name;
private final int age;
public static int compareByAge(Person a, Person b) { ... }
public static int compareByName(Person a, Person b) { ... }
}
Person[] people = ...
Arrays.sort(people, #Person.compareByAge);
