jdk8 new features

New features of jdk8: 1. Lambda expression; 2. Stream API; 3. Functional interface; 4. Default method; 5. Method reference; 6. New date and time API; 7. Concurrency enhancement ; 8. Other improvements, etc.

JDK 8 is a version of the Java Development Kit (Java Development Kit) that introduces many new features and improvements to provide Java developers with more Lots of features and flexibility. Below I will introduce in detail some of the major new features of JDK 8.

Lambda expression: Lambda expression is one of the most important new features in JDK 8. It allows us to write code in a more concise and functional way. Through Lambda expressions, we can pass functions as parameters to other methods, allowing for more flexible programming. Lambda expressions make the code easier to read and write, and can improve the maintainability of the code.

Stream API: The Stream API is a new API introduced in JDK 8 for processing collections and arrays. It provides a streaming method that makes it easier to operate and process data. Stream API supports parallel processing, which can improve program execution efficiency. By using the Stream API, we can more easily implement operations such as filtering, mapping, and reduction, and process collection data in a more elegant way.

Functional interface: JDK 8 introduced the concept of functional interface. A functional interface is an interface that contains only one abstract method, which can be used as a type for Lambda expressions. A functional interface can be marked with the @FunctionalInterface annotation to ensure that it contains only one abstract method. The introduction of functional interfaces enables Java to support functional programming and make it easier to use Lambda expressions.

Default method: Before JDK 8, interfaces could only contain abstract methods and constants. JDK 8 introduced the concept of default methods, which can implement default implementations of methods in interfaces. Default methods can provide a default implementation in the interface, thereby avoiding the need to modify the implementation class due to changes in the interface. Default methods allow the interface to be extended more flexibly while maintaining backward compatibility.

Method reference: Method reference is a more concise way of representing Lambda expressions. It allows us to reference existing methods directly rather than through Lambda expressions. Method references can improve the readability and maintainability of code while reducing the writing of duplicate code.

New date and time API: JDK 8 introduces a new set of date and time API to replace the old Date and Calendar classes. The new date and time API is simpler to use and provides more functionality. It supports the processing of date, time, time zone, time interval, etc., and provides more operation methods and formatting options.

Concurrency enhancements: JDK 8 has enhanced concurrent programming. It introduces some new concurrency tools and classes to make concurrent programming easier and more efficient. These include CompletableFuture class, StampedLock class, parallel array, etc. These enhancements allow developers to better handle concurrency issues and improve program performance and scalability.

Other improvements: In addition to the major new features mentioned above, JDK 8 also introduces many other improvements, including improved type inference, duplicate annotations, new compiler APIs, etc. These improvements make the Java language more modern and powerful, providing more programming options and flexibility.

To summarize, JDK 8 introduces many exciting new features, including Lambda expressions, Stream API, functional interfaces, default methods, method references, new date and time APIs, etc. These new features make the Java language more modern, flexible and powerful, and can better meet the needs of developers. For programmers, mastering and applying these new features can improve the readability, maintainability and scalability of the code, thus improving development efficiency and code quality.

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