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How to parse jshell in JDK9, I believe many inexperienced people are helpless about this, for this reason this article summarizes the causes and solutions of the problem, through this article I hope you can solve this problem.

JDK9 jshell

JDK9 has been released for some time now, so JDK9 in addition to those we do not use or more advanced beginners do not have access to features, what is a beginner can use and relatively easy to use features? Jshell should count as one.

In the past few years, some foreign universities have replaced Java with JS as the programming language for university learning, excluding some other reasons.(For example, most people think JS is easier), there is no shell support believe that also accounts for a large part of the reason, after all, when speaking to beginners, JS only need to enter console.log in the shell ("hello world") and then enter to see the result, java is very troublesome, a simple hello world needs to create a.java file, so that it contains a public class and contains a public static void main (String[] args) method, and then compile and run, and then print this hello world, maybe you just want to print hello world, but you need to explain to students (or other beginners) why you need a class, why you need a main method, how to compile.java files into.class files, and how to run this.class file, and finally, you can tell students, See, it worked, isn't it troublesome? Also, even if you know all this, if you learn a new function one day, such as Math.max(number , number), and you simply want to verify that the function works, you still need to create a.java file with a main method, compile it, and run it, which is quite troublesome.

The above problems have been taken seriously in JDK9, JDK9 finally added shell support jshell, now you want to print a hello world, no longer need to be as troublesome as before, now you just need to open the command line, type jshell (need the correct configuration environment variables, as before) into the java shell interactive interface, and then enter System.out.println("hello world") and enter, just like the following figure:

And what if I want to run Math.max(number , number)? Just this:

What if I want to quit jshell? Just type/exit and enter:

See, isn't it easier than before? For beginners, this feature allows them to focus more on learning the java language itself rather than learning how to configure the java environment, how to compile, etc.(although this is also important, but beginners do not have to worry too much about it), and even for those who are already working, this feature can greatly improve work efficiency in many cases (such as verifying some simple function calls in it).

After reading the above, do you know how to parse jshell in JDK9? If you still want to learn more skills or want to know more related content, welcome to pay attention to the industry information channel, thank you for reading!

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