抛出异常后，jshell继续执行我的脚本。如何让它停止？ [英] jshell continues executing my script after exception is thrown. How to make it stop?

问题描述

我尝试编写一些jshell脚本。当抛出异常时，jshell仍继续执行下一行。

I tried writing some jshell scripts. When an exception is thrown, jshell still goes on to execute the next line.

如何使我的脚本更像普通的java程序？

How can I make my scripts behave more like normal java programs?

编辑 ：我只是像 jshell SCR.jsh 一样运行。

使用抛出新的异常（）或 1/0 不要阻止下一行被执行。

Using throw new Exception() or 1/0 does not prevent the next line from being executed.

该脚本包括如下语句：

System.out.println(1/0)
System.out.println("foo")
/exit

我认为第二行无法访问。这就是我的预期。但是在打印异常后，还会打印 foo 。

I thought the second line is unreachable. That's what I expected. But after the exception is printed, foo is also printed.

推荐答案

根据我的理解，即使在抛出异常之后， jshell 执行脚本中的所有行也是因为它将您的脚本视为的列表 Snippet 。

As per my understanding, the reason why jshell executes all the lines in your script even after one throws an Exception is since it treats your script as a list of Snippet.

所有表达式都被接受为片段。这包括没有副作用的表达式
，例如常量，变量访问和lambda
表达式：

All expressions are accepted as snippets. This includes expressions without side effects, such as constants, variable accesses, and lambda expressions:

1
a
x -> x+1
(String s) -> s.length()

以及带有副作用的表达式，例如赋值和
方法调用

as well as expressions with side effects, such as assignments and method invocations

System.out.println("Hello world");
new BufferedReader(new InputStreamReader(System.in))

因此，即使其中一个片段引发异常，其他人也必须遵循 评估打印循环 （REPL）模式。同样自己回答将代码转换为语句块，将其标记为单个代码段当抛出 java.lang.ArithmeticException 时标记其完成。

So even one of the snippet throws an exception, the others must follow the Read-Eval-Print Loop(REPL) pattern. As also answered yourself converting the code as a block of statement marks it as a single Snippet which when throws the java.lang.ArithmeticException marks its completion thereby.

虽然理想情况下，此类陈述应改为定义为声明摘录。

Though ideally, such statements should be instead defined as a declaration snippet.

声明摘录（ ClassDeclaration ， InterfaceDeclaration ，
MethodDeclaration 或 FieldDeclaration ）是一个显式
引入了一个名称，可以被其他代码段引用。

A declaration snippet (ClassDeclaration, InterfaceDeclaration, MethodDeclaration, or FieldDeclaration) is a snippet that explicitly introduces a name that can be referred to by other snippets.

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