将包专用类导入到JShell [英] Importing Package-Private Classes to JShell

问题描述

在Java 9发行后，我一直在使用JShell，并且尝试导入自己制作的软件包.由于我要为其编写代码的整个应用程序都包含在该程序包中，因此除了一个类(我尚未编码)之外的每个类都是程序包私有的.我的类路径是正确的，但是我仍然不能使用JShell包中声明的任何类型(它会引发找不到符号"错误). 我需要将它们公开以使其可以访问，还是可以通过某种方式测试软件包专用类 ?这是我尝试过的确切代码.

I was playing around with JShell after the Java 9 release, and I tried importing a package I made. As the entire application I'm coding it for will be contained in that package, every class but one (which I haven't coded yet) is package-private. My classpath is correct, but I still can't use any of the types declared in the package in JShell (it throws a "cannot find symbol" error). Do I need to make them public for them to be accessible, or is there some way I can test package-private classes? Here's the exact code I tried.

我当前的目录是

C:\Users\Sylvaenn\OneDrive\Documents\Programs\Java\src

我的课程路径是

C:\Users\Sylvaenn\OneDrive\Documents\Programs\Java\cls

，包目录(用于字节码)为

and the package directory (for the bytecode) is

C:\Users\Sylvaenn\OneDrive\Documents\Programs\Java\cls\collatz

CollatzSequence是collatz中包含的程序包专用类.

CollatzSequence is a package-private class contained in collatz.

PS C:\Users\Sylvaenn> cd OneDrive\Documents\Programs\Java\src
PS C:\Users\Sylvaenn\OneDrive\Documents\Programs\Java\src> jshell
|  Welcome to JShell -- Version 9
|  For an introduction type: /help intro

jshell> import collatz.*;

jshell> CollatzSequence seq = new CollatzSequence(BigInteger.ONE);
|  Error:
|  cannot find symbol
|    symbol:   class CollatzSequence
|  CollatzSequence seq = new CollatzSequence(BigInteger.ONE);
|  ^-------------^
|  Error:
|  cannot find symbol
|    symbol:   class CollatzSequence
|  CollatzSequence seq = new CollatzSequence(BigInteger.ONE);
|                            ^-------------^

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.*
|    import collatz.*

jshell>

推荐答案

据我所知(如果我错了，请纠正我)，您无法使用JShell在特定的程序包中创建类 (在JShell中创建的类始终在默认包中.

As far as i know (correct me if i am wrong), you cannot create a Class in a specific package using JShell (classes created within JShell are always in the default package).

话虽如此，您不能从JShell中访问程序包专用类.这是Java的正常"行为.

That being said, you cannot access your package-private classes from within JShell. This is "normal" Java behaviour.

这篇关于将包专用类导入到JShell的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！