Freaks City

The Functon interface in Java 8 represents an operation that accepts one argument and produces a result. This functional interface contains the abstarct method apply which defines the transformation logic. @FunctionalInterface public interface Transformer<T, R> { R transform(T input); default <V> Transformer<V, R> com ...

To enable iteration over a collection using enhanced for-loops, a class must implement the Iterable interface. This contract requires providing an Iterator instance via the iterator() method — essentially granting permission to be traversed element by element. // Minimal Iterable interface public interface Iterable<T> { Iterator<T& ...

Core Date-Time Classes in Java 8 Java's traditional date and time handling prior to Java 8 presented challenges due to unintuitive design and thread safety concerns in java.util.Date and java.util.Calendar. The Java 8 Date-Time API introduced immutable, thread-safe alternatives including LocalDate, LocalTime, and LocalDateTime. Date Handling wi ...

Method referecnes in Java 8 provide a concise syntax to refer directly to methods or constructors without executing them. They are useful when a lambda expression merely calls an existing method, allowing the code to be more readable and reusable. Consider a Person class: public class Person { public enum Sex { MALE, FEMALE } String na ...