Java 8 Features - Complete Tutorial Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Java 8 is the most awaited release of the Java programming language development because, in the entire history of Java, it has never released that many major features. It consists of major features of Java. It is a new version of Java and was released by Oracle on 18 March 2014. Java provided support for functional programming, new Java 8 APIs, a new JavaScript engine, a new Java 8 streaming API, functional interfaces, default methods, date-time API changes, etc. Major Java 8 Features IntroducedThere are a few major Java 8 features mentioned below: Lambda Expressions: Concise functional code using ->.Functional Interfaces: Single-method interfaces.Introduced and Improved APIs: Stream API: Efficient Data Manipulation.Date/Time API: Robust Date and Time Handling.Collection API Improvements: Enhanced Methods for Collections (e.g., removeIf, replaceAll).Concurrency API Improvements: New classes for parallel processing (e.g., CompletableFuture).Optional Class: Handle null values safely.forEach() Method in Iterable Interface: Executes an action for each element in a Collection.Default Methods: Evolve interfaces without breaking compatibility.Static Methods: Allows adding methods with default implementations to interfaces.Method References: Refer to methods easily.This Java 8 tutorial covers all the important Java 8 features like Java 8 APIs, Java arrays, Java 8 ArrayList, and many more included in the Java 8 programming language. To explore detail features of Java language you can explore Java course, in this course you will get a free full beginner to advanced topics of Java programming.Java 8 FeaturesLambda ExpressionsFunctional InterfacesMethod ReferenceStreamsComparable and ComparatorOptional ClassDate/Time APILambda ExpressionsLambda Expression basically expresses an instance of the functional interface, in other words, you can say it provides a clear and concise way to represent a method of the functional interface using an expression. Lambda Expressions are added in Java 8.Lambda Expressions in Java 8Lambda Expressions ParametersJava Lambda Expression with CollectionsLambda Expression Variable Capturing with ExamplesHow to Create Thread using Lambda Expressions in Java?Serialization of Lambda Expression in JavaBlock Lambda Expressions in JavaMatch Lambdas to Interfaces in JavaConverting ArrayList to HashMap in Java 8 using a Lambda ExpressionCheck if a String Contains Only Alphabets in Java Using Lambda ExpressionRemove Elements From a List that Satisfy a Given Predicate in JavaFunctional InterfacesAn interface that contains only one abstract method is known as a functional interface, but there is no restriction, you can have n number of default and static methods inside a functional interface.Functional Interfaces in JavaConsumer Interface in Java with ExamplesBiConsumer Interface in Java with ExamplesPredicate Interface with ExamplesFunction Interface in Java with ExamplesSupplier Interface in Java with ExamplesMethod ReferenceMethod reference is a shorthand notation of a lambda expression to call a method. There are four types of method references that are as follows:Static Method ReferenceInstance Method Reference of a particular objectInstance Method Reference of an arbitrary object of a particular typeConstructor Reference.Example:numList.stream().filter(n -> n > 5).sorted().forEach(System.out::println);Method References in Java with examplesConverting ArrayList to HashMap using Method Reference in Java 8StreamsStream API is introduced in Java 8 and is used to process collections of objects with the functional style of coding using the lambda expression. So to understand what stream API is, you must have knowledge of both lambda and functional interfaces.Java 8 StreamDifference Between Streams and Collections in JavaImplement Filter Function using Reduce in Java 8 StreamsJava Stream API – FiltersParallel vs Sequential Stream in JavaFunctional Programming in Java 8+ using the Stream API with ExampleIntermediate Methods of Stream in JavaDifference Between map() And flatMap() In Java StreamArray to Stream in Java10 Ways to Create a Stream in JavaHow to Print Elements of a Stream in Java 8Collecting a Stream to an Immutable Collection in JavaComparing Streams to Loops in JavaWhy You Need to Close the Java Streams in Finally Block?Convert an Iterable to Stream in JavaConvert an Iterator to Stream in JavaDifference Between Stream.of() and Arrays.stream() method in JavaConvert Stream to Set in JavaConvert a Set to Stream in JavaStreams on Arrays in Java 8Java Stream ProgramsJava Streams provide a powerful and expressive way to process sequences of elements in Java, enabling functional-style operations on collections of data. The Stream API, introduced in Java 8, facilitates efficient data manipulation and transformation using a sequence of operations that can be performed in parallel or sequentially. Java Stream Programs will give a clear view to the topic: Program to Convert a Map to a Stream in JavaProgram to Convert Boxed Array to Stream in JavaProgram to Convert Primitive Array to Stream in JavaProgram to Convert a Set to Stream in Java using GenericsProgram to Convert List to Stream in JavaProgram to Convert Stream to an Array in JavaHow to get Slice of a Stream in JavaFlattening Nested Collections in JavaHow to Convert a Stream into a Map in JavaFind the First Element of a Stream in JavaFind the Last Element of a Stream in JavaHow to Find Duplicate Elements in a Stream in JavaCount the Occurrence of a Given Character in a String Using Stream API in JavaReverse Elements of a Parallel Stream in JavaHow to Get ArrayList From Stream in Java 8Generate Infinite Stream of Double in JavaGenerate Infinite Stream of Integers in JavaProgram to Iterate over a Stream with Indices in Java 8Flatten a Stream of Arrays in Java using forEach loopFlatten a Stream of Lists in Java using forEach loopFlatten a Stream of Map in Java using forEach loopConvert a String to a List of Characters in JavaInitialize a List in a Single Line with a Specified Value using Java StreamJava Stream MethodsMethods related to one of the most powerful features of Java Stream are mentioned below.Stream forEach() method in Java with ExamplesStream forEachOrdered() Method in Java with Examplesforeach() loop vs Stream foreach() vs Parallel Stream foreach()Stream of() method in JavaJava Stream findAny() with ExamplesStream anyMatch() in Java with ExamplesStream allMatch() in Java with ExamplesStream filter() in Java with ExamplesStream sorted (Comparator comparator) Method in JavaStream sorted() in JavaStream.distinct() in JavaStream.concat() in JavaStream.reduce() in Java with Examplesstream.limit() method in JavaStream ofNullable(T) method in Java with ExamplesStream dropWhile() method in Java with ExamplesStream iterate(T,Predicate,UnaryOperator) Method in Java with ExamplesStream takeWhile() method in Java with Examplesconcat() Method of Stream Interface in Java APIStream findFirst() in Java with ExamplesDoubleStream mapToObj() in JavaStream.Builder accept() Method in JavaIntStream.Builder add() Method in JavaDoubleStream.Builder build() in JavaStream.Builder build() in JavaCollectors.joining() Method with ExamplesStream builder() in Java with ExamplesStream empty() in Java with ExamplesLongStream flatMap(LongFunction mapper) in JavaLongStream filter() in Java with ExamplesComparable and ComparatorComparable and Comparator are interfaces used to order objects. They are particularly useful in sorting operations and collections that require natural ordering. Here we will learn about Comparable and Comparator in depth.Comparable vs Comparator in JavaComparator Interface in Java with ExamplesWhy to Use Comparator Interface Rather than Comparable Interface in Java?Sort an Array of Triplet using Java Comparable and ComparatorJava Program to Sort LinkedList using ComparableHow to Sort HashSet Elements using Comparable Interface in Java?Sort LinkedHashMap by Values using Comparable Interface in JavaSort LinkedHashMap by Keys using Comparable Interface in JavaHow to Sort LinkedHashSet Elements using Comparable Interface in Java?Optional ClassJava 8 Optional ClassOptional ofNullable() Method in Java with ExamplesOptional orElse() Method in Java with ExamplesOptional ifPresentOrElse() Method in Java with ExamplesOptional orElseGet() Method in Java with ExamplesOptional filter() Method in Java with ExamplesOptional empty() Method in Java with ExamplesOptional hashCode() Method in Java with ExamplesOptional toString() Method in Java with ExamplesOptional equals() Method in Java with ExamplesOptional stream() Method in Java with examplesOptional or() Method in Java with ExamplesOptional get() Method in Java with ExamplesOptional isPresent() Method in Java with ExamplesOptional orElseThrow() Method in Java with ExamplesOptional of() method in Java with ExamplesDate/Time APIThis section gives you to handle the ever-changing world of dates and times within your Java programs. Explore working with calendars, timestamps, and time manipulation – essential skills for building applications that deal with deadlines, scheduling, or even historical data analysis.Date-Time API in Java 8java.time.LocalDate Class in Javajava.time.LocalTime Class in Javajava.time.LocalDateTime Class in Javajava.time.MonthDay Class in Javajava.time.OffsetTime Class in Javajava.time.OffsetDateTime Class in Javajava.time.Clock Class in Javajava.time.ZonedDateTime Class in Javajava.time.ZoneId Class in Javajava.time.ZoneOffset Class in Javajava.time.Year Class in Javajava.time.YearMonth Class in Javajava.time.Period Class in Javajava.time.Duration Class in Javajava.time.Instant Class in JavaJava 8 Clock instant() method with ExamplesJava 8 Clock fixed() method with ExamplesMiscellaneousJava is a versatile and powerful programming language that encompasses a wide range of features and tools, enabling developers to build robust, high-performance applications. Let us learn some Java Miscellaneous topics are mentioned below:Default Methods In Java 8Static method in Interface in JavaCan We Override Default Method in Java?forEach() method in JavaNashorn JavaScript Engine in Java with ExamplesMetaSpace in Java 8 with ExamplesJava class dependency analyzer in Java 8 with ExamplesLongUnaryOperator Interface in JavaIntUnaryOperator Interface in JavaDoubleUnaryOperator Interface in JavaUnaryOperator Interface in JavaObjLongConsumer Interface with ExampleObjIntConsumer Interface with ExampleObjDoubleConsumer Interface with ExampleDoubleSupplier Interface with ExamplesBooleanSupplier Interface with ExamplesIntSupplier Interface with ExamplesLongSupplier Interface with ExamplesLongConsumer Interface in Java with ExamplesDoubleConsumer Interface in Java with ExamplesIntConsumer Interface in Java with ExamplesLongFunction Interface in Java with ExamplesIntFunction Interface in Java with ExamplesToDoubleFunction Interface in Java with ExamplesDoubleFunction Interface in Java with ExamplesToIntFunction Interface in Java with ExamplesLongToIntFunction Interface in Java with ExamplesToLongFunction Interface in Java with ExamplesLongToDoubleFunction Interface in Java with ExamplesToLongBiFunction Interface in Java with ExamplesToIntBiFunction Interface in Java with ExamplesToDoubleBiFunction Interface in Java with ExamplesDoubleToLongFunction Interface in Java with ExamplesIntToDoubleFunction Interface in Java with ExamplesIntToLongFunction Interface in Java with ExamplesDoubleToIntFunction Interface in Java with ExampleArrayDeque removeIf() method in Java with ExamplesConclusionJava 8 has brought many exciting features that make it a powerful tool for developers. With the introduction of Lambda expressions, Stream API, and new Date and Time API, Java 8 has improved code efficiency and readability. These Java 8 features allow developers to write more flexible and concise code, making their work easier and more enjoyable. Overall, Java 8 continues to be a valuable update that has significantly enhanced the Java programming language. Comment More infoAdvertise with us Next Article Introduction to Java A abhishek1 Follow Improve Article Tags : Java Java 8 Tutorials Practice Tags : Java Similar Reads Java Tutorial Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. Known for its Write Once, Run Anywhere capability, which means code written in Java can run on any device that supports the Java Virtual Machine (JVM).Syntax and s 7 min read BasicsIntroduction to JavaJava is a high-level, object-oriented programming language developed by Sun Microsystems in 1995. 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