jshell

问题 This question already has answers here : In JShell, how to import classpath from a Maven project (3 answers) Closed last year . I have stored all the jar file into specific folder and I have added specific folder to Jshell classpath. I am unable to import packages in jshell after adding classpath. It is working fine If I have mentioned all the jar file name in classpath. I don't want to mentioned all the Jar file name in classpath because I have to add more than thousand number of jar files

问题 This question already has answers here : Java 9 no class definition exception (3 answers) Closed last year . Here is the code snippet that I use: HttpClient client = HttpClient.newHttpClient(); HttpRequest request = HttpRequest.newBuilder(URI.create("https://www.google.com")).GET().build(); HttpResponse.BodyHandler responseBodyHandler = HttpResponse.BodyHandler.asString(); HttpResponse response = client.send(request, responseBodyHandler); System.out.println("Status code = " + response

问题 I write a Java method in JShell and now I want to debug it. I would like to set breakpoints or at least step through an execution line-by-line. Does JShell have these debugging abilities? 回答1: Just to clarify further, from the JEP: The Java Shell (Read-Eval-Print Loop) itself, the Non-Goals states : Out of scope are graphical interfaces and debugger support . The JShell API is intended to allow JShell functionality in IDEs and other tools, but the jshell tool is not intended to be an IDE .

问题 I went through a couple of tutorials for JShell and I still do not understand the most important part: why would I even use JShell? Here what Oracle says: "You can test individual statements, try out different variations of a method, and experiment with unfamiliar APIs within the JShell session". Yes, great, but for all those things I can just use an IDE. I do understand, that REPL should make code evaluation faster. However, testing a snippet of code in IDE in a dummy Hello World project

问题 Java 9 has a read-eval-print loop for Java, called jshell . I've seen it work in it's basic mode, from the command line. Can it also be used in a remote process? In other words, can I connect to another Java process and enter code snippets to run within that runtime? This would be a nice way to change configuration state in an app server without having to write an admin tool with a UI. 回答1: The simple answer is no, there is no way to attach jshell to a running Java process. jshell is a

问题 I didn't find any command to clear Java-9 JShell console. I also tried to clear the JShell Console through this program, but it doesn't work either. import java.io.IOException; class CLS { public static void main(String... arg) throws IOException, InterruptedException { new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor(); } } I think we don't have that functionality available yet in the early access. Anyone got an idea? 回答1: You can use the following command (reference):

问题 Question: How to take user input in jshell script ? or what I'm doing wrong? Note: I'm NOT looking how to pass arguments to jshell script. Example: For example script hello.java : Scanner in = new Scanner(System.in); System.out.print("Enter number n1: "); int n1 = in.nextInt(); System.out.print("Enter number n2: "); int n2 = in.nextInt(); System.out.println("n1 + n2 = "+ (n1 +n2)); /exit It works if I type line by line in jshell, but then I run jshell hello.java it doesn't. Throws java.util

问题 I'm discovering JShell and I discovered the imports added in by default: jshell> /imports | import java.io.* | import java.math.* | import java.net.* | import java.nio.file.* | import java.util.* | import java.util.concurrent.* | import java.util.function.* | import java.util.prefs.* | import java.util.regex.* | import java.util.stream.* After doing that I added my own import using the following command: import java.lang.Math Is there a way to remove the latter import without killing the

问题 Why does my jshell instance (JDK Version 9-ea) unable to identify printf() statement ? Below is the error I observe, jshell> printf("Print number one - %d",1) | Error: | cannot find symbol | symbol: method printf(java.lang.String,int) | printf("Print number one - %d",1) | ^----^ I am able to access printf, provided I specify it in a regular way. jshell> System.out.printf("Print number one - %d",1) Print number one - 1$1 ==> java.io.PrintStream@1efbd816 Any pointers? 回答1: An earlier version of

问题 I'm trying to run some Java code at run-time through a JShell instance I created using the JShell API. To demonstrate my problem, I'm going to share my simple code. With my current setup I have a directory called lib that has the MySQL Java driver: mysql-connector-java-5.1.35.jar . Launching JShell via command tool and adding the needed module as: jshell --module-path lib --add-modules mysql.connector.java and then loading the mysql driver works for me : jshell> Class.forName("com.mysql.jdbc