Methods which are defined inside the interface and tagged with default keyword are known as default methods. Java provides a facility to create default methods inside the interface. The java.time package contains Java 8 Date and Time classes. Java has introduced a new Date and Time API since Java 8. So, you can pass lambda expression as an argument. This method takes a single parameter which is a functional interface. Collection classes which extends Iterable interface can use forEach() method to iterate elements. It is a default method defined in the Iterable interface. It is defined in Iterable and Stream interfaces. Java provides a new method forEach() to iterate the elements. It provides methods to check the presence of value for particular variable. We must import java.util package to use this class. It is a public final class which is used to deal with NullPointerException in Java application. Java introduced a new class Optional in Java 8. It can also declare methods of object class.įunctional interfaces are also known as Single Abstract Method Interfaces (SAM Interfaces). It can have any number of default and static methods. Each time when you are using lambda expression to just referring a method, you can replace your lambda expression with method reference.Īn Interface that contains only one abstract method is known as functional interface. It is compact and easy form of lambda expression.
Java 8 Method reference is used to refer method of functional interface.
It is very useful in collection library in which it helps to iterate, filter and extract data.įor more information and examples: click here It provides a clear and concise way to implement SAM interface(Single Abstract Method) by using an expression. Lambda expression helps us to write our code in functional style. Java 8 provides following features for Java Programming: It includes various upgrades to the Java programming, JVM, Tools and libraries. It was a revolutionary release of the Java for software development platform. Oracle released a new version of Java as Java 8 in March 18, 2014.
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