问题描述
似乎在另一个JShell
中创建的JShell
对象无权访问父级的JShell
范围.例如:
It seems, that JShell
object created inside another JShell
does not have access to parent's JShell
scope. For instance:
jshell> int x = 1;
x ==> 1
jshell> x
x ==> 1
jshell> jdk.jshell.JShell js = jdk.jshell.JShell.create();
js ==> jdk.jshell.JShell@1a052a00
jshell> js.eval("x");
$4 ==> [SnippetEvent(snippet=Snippet:ErroneousKey#1-x,previousStatus=NONEXISTENT,status=REJECTED,isSignatureChange=false,causeSnippetnull)]
jshell> js.eval("int x = 2;");
$5 ==> [SnippetEvent(snippet=Snippet:VariableKey(x)#2-int x = 2;,previousStatus=NONEXISTENT,status=VALID,isSignatureChange=true,causeSnippetnullvalue=2)]
jshell> js.eval("x");
$6 ==> [SnippetEvent(snippet=Snippet:ExpressionKey(x)#3-x,previousStatus=NONEXISTENT,status=VALID,isSignatureChange=true,causeSnippetnullvalue=2)]
是否有可能使父范围对孩子可见?
Is it somehow possible to make parent scope visible to the child one?
推荐答案
用于创建的Javadoc ()说:
当您遵循 build(),您会发现:
换句话说:最有可能的是,您正在创建另一个外壳运行的另一个 JVM实例.因此,至少目前为止:没有 child jshell知道其父级的机会.
In other words: most likely, you are creating another JVM instance where that other shell runs. So at least for now: no chances of having a child jshell know about its parent.
(如:我很希望Java的REPL功能可以在将来的某个时候将JShell附加到已经运行的JVM上)
( as in: I seriously hope that this REPL feature of Java will allow at some future point to attach a JShell to an already running JVM )
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