Shulou(Shulou.com)06/03 Report--

This article mainly introduces "what are the new features of JAVA 8". In daily operation, I believe many people have doubts about the new features of JAVA 8. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "what are the new features of JAVA 8?" Next, please follow the editor to study!

Practical summary of new features of JAVA 8

As a veteran programmer who has worked for more than two years, although he used jdk1.8 as a learning and using version from the beginning, with the iteration of technology, the existing JDK version has grown rapidly to JDK 15 from two years ago to the present. Really feel a little difficult to learn, the update speed is too fast, but compared with the existing system and domestic trends. Most companies still use the most basic 1.8 as an online environment. There is no problem, but will we really use JAVA8?

Overview of New Featur

This summary mainly starts with the Lambda expression, from shallow to deep, according to the practicality as the ranking, gradually explain the happiness that the new features bring to developers, how to better simplify the code and optimize readability. This is one of the purposes for us to learn to summarize this section.

Can you use traversal loops?

Starting from the most basic loop, the loop is nothing more than the most basic loop structure that we need to contact with for when we first learn, and we will always use a lot of it in the later work. How to simplify it better?

/ / establish test set List list = Arrays.asList (1, 2, 2, 3, 4, 5, 5, 6); / / basic cycle System.out.println ("- 1 basic cycle"); for (int I = 0; I

< list.size(); i++) { System.out.println(list.get(i)); } // 语法糖方式 System.out.println("----------------------------2 迭代器语法糖"); for (Integer i : list) { System.out.println(i); } // lambda 表达式简写 System.out.println("----------------------------3 lambda"); list.forEach(item ->

System.out.println (item)); / / use the lambda method to reference System.out.println ("- 4 lambda"); list.forEach (System.out::println); / / the following is the compiled syntax sugar code Iterator var4 = list.iterator (); while (var4.hasNext ()) {Integer I = (Integer) var4.next () System.out.println (I);}

As we can see from the above code, with the introduction of lambda, the code becomes more and more simplified, easier to read and less written.

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The first method is our regular mode of operation, which is generally applicable to businesses that need subscript logic.

The second is iterator syntax sugar, which is easy for developers to write, but for code compilation, the compiled code is any way of iterator, but the syntax is simple.

Lambda is a functional expression. Item is the parameter of our loop, and after the arrow is the block of code that we need to execute. A sentence of code does not have to use {} at all.

Lambda method reference is a new way, the word reference is often used by us, generally there is a meaning in the reference of the object, in short, a value can be referenced from a place to use, but now, the method can be regarded as a value, or you can take it and use it at will

ForEach

Friends may wonder why lambda expressions can be used in forEach, but not elsewhere. Let's look at the source code.

Default void forEach (Consumer

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