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Learn about the new features and enhancements of Java 8, such as lambda expressions, method references, functional interfaces, stream API, default methods, and more. See examples of how to use these features in your Java code and compare them with previous versions.
- Lambda Expressions. Lambda 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.
- Functional Interfaces. An 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.
- Method Reference. Method reference is a shorthand notation of a lambda expression to call a method. There are four types of method references that are as follows
- Streams. Stream API is introduced in Java 8 and is used to process collections of objects with the functional style of coding using the lambda expression.
Sep 11, 2022 · Here are the links to all the Java 8 tutorials in the systematic order: Java 8 features. 1. Java 8 – Lambda Expression 2. Java 8 – Method references 3. Java 8 – Functional interfaces 4. Java 8 – Interface changes: Default and static methods 5. Java 8 – Streams 6. Java 8 – Stream filter 7. Java 8 – forEach() 8. Java 8 ...
- Functional Interfaces And Lambda Expressions. In Java 8, a new notion called functional interfaces was introduced. A Functional Interface is an interface that has exactly one abstract method.
- forEach() Method In Iterable Interface. In Java 8, the Java.lang interface now supports a “forEach” function. Iterable that can iterate over the collection’s items.
- Optional Class. In Java 8, the “java.util” package included an optional class. The public final class “Optional” is used to handle NullPointerException in a Java program.
- Default And Static Methods In Interfaces. In Java 8, you may add non-abstract methods to interfaces, allowing you to create interfaces with method implementation.
- forEach() method in Iterable interface. Whenever we need to traverse through a Collection, we need to create an Iterator whose whole purpose is to iterate over, and then we have business logic in a loop for each of the elements in the Collection.
- default and static methods in Interfaces. If you read forEach method details carefully, you will notice that it’s defined in Iterable interface but we know that interfaces can’t have a method body.
- Functional Interfaces and Lambda Expressions. If you notice the above interface code, you will notice @FunctionalInterface annotation. Functional interfaces are a new concept introduced in Java 8.
- Java Stream API for Bulk Data Operations on Collections. A new java.util.stream has been added in Java 8 to perform filter/map/reduce like operations with the collection.
Nov 17, 2021 · Learn the important Java 8 features such as lambda expressions, functional interfaces, default methods, streams and date-time API changes with examples. This tutorial covers the syntax, rules, advantages and disadvantages of each feature and provides links to more resources.
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Learn the key features of Java 8, such as lambda expressions, functional interfaces, stream API, optional class, and date and time API. See coding examples, quizzes, and interview questions for Java 8.
