You need to import 64 class in your source file to use its methods. Java provides a class Base64 to deal with encryption and decryption. This method takes predicate as an argument and returns a stream of resulted elements.įor more information and examples: click here Java Base64 Encoding and Decoding Suppose, you want to get only even elements of your list, you can do this easily with the help of filter() method. Java stream provides a method filter() to filter stream elements on the basis of given predicate. So, it executes only when it requires.įor more information and examples: click here Stream Filter Java 8 package consists of classes, interfaces and an enum to allow functional-style operations on the elements. It provides reduction operations, such as accumulating elements into collections, summarizing elements according to various criteria etc.įor more information and examples: click here Stream API Now, you can create string by passing delimiters like comma(,), hyphen(-) etc.įor more information and examples: click here CollectorsĬollectors is a final class that extends Object class. It is used to construct a sequence of characters separated by a delimiter. Java added a new final class StringJoiner in java.util package. You can execute JavaScript code by two ways:įor more information and examples: click here StringJoiner Java provides a command-line tool jjs which is used to execute JavaScript code. It is used to execute JavaScript code dynamically at JVM (Java Virtual Machine). These methods are non-abstract methods and can have method body.įor more information and examples: click here Nashorn JavaScript Engine 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.įor more information and examples: click here Default Methods Java has introduced a new Date and Time API since Java 8. So, you can pass lambda expression as an argument.įor more information and examples: click here Date/Time API 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.įor more information and examples: click here forEach 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).įor more information and examples: click here Optional 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.įor more information and examples: click here Functional InterfaceĪn 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 Method References 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. OpenJDK 64-Bit Server VM (build 25.Oracle released a new version of Java as Java 8 in March 18, 2014. OpenJDK Runtime Environment (build 1.8.0_252-b09) OpenJDK 64-Bit Server VM AdoptOpenJDK (build 13.0.2+8, mixed mode, sharing)įor reference, my system jdk is 1.8.0.252. OpenJDK Runtime Environment AdoptOpenJDK (build 13.0.2+8) Is an updated version of java included with 7.7? Everything else is working fine and don't want to start messing around with reconfiguring it to use the system java instead if I don't have to. Anyone else come across this and if so, how did you overcome it? To be honest, I had no idea that a jdk was bundled with Elasticsearch and thought it used the system default, but here we are. I am running a 3 node, 7.6.2 cluster and came across the following critical alert during my latest Nessus scan on each: The following Java JRE installation is unsupported :
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