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. % /usr/libexec/java_home -v 1.8.0_06 -exec javac -versionįor more information, see the java_home(1) man page.Oracle released a new version of Java as Java 8 in March 18, 2014. To run a different version of Java, either specify the full path, or use the java_home tool: Java HotSpot(TM) 64-Bit Server VM (build 23.2-b04, mixed mode) Java(TM) SE Runtime Environment (build 1.8.0_06-ea-b13) If the installed version is 8u6, you will see a string that includes the text 1.8.0_06. You can determine which version of the JDK is the default by typing java -version in a Terminal window. It is possible for the version of the JRE to be different than the version of the JDK. When launching a Java application through the command line, the system uses the default JDK. There can be multiple JDKs installed on a system, as many as you wish. See 'Note for Users of OS X that Include Apple Java 6 Plug-in'. If you have not yet installed Apple's Java OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences app. Determining the Default Version of the JDK

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