<div dir="ltr"><div class="markdown-here-wrapper" style=""><p style="margin:0px 0px 1.2em!important">Is there a reason not to allow implicit Unnamed Variables in try-with-resources and Catch-block?</p>
<p style="margin:0px 0px 1.2em!important">To allow:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-java" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"> <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">try</span> (Scope.open()) {
...
}
---
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">try</span> { ... }
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">catch</span> (Exception) { ... }
</code></pre>
<p style="margin:0px 0px 1.2em!important">to be implicitly</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code class="hljs language-java" style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;display:block;overflow-x:auto;padding:0.5em;color:rgb(51,51,51);background:rgb(248,248,248)"> <span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">try</span> (var _ = Scope.open()) {
...
}
---
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">try</span> { ... }
<span class="hljs-keyword" style="color:rgb(51,51,51);font-weight:bold">catch</span> (Exception _) { ... }
</code></pre>
<p style="margin:0px 0px 1.2em!important">Unlike a normal expression, and expression on the RHS of a try-with-resources variable has an explicit context, there is no fear of someone forgetting the result of the expression by mistake.</p>
<p style="margin:0px 0px 1.2em!important">In a Catch block the exception is uniquely accessible through the variable declared in the declaration of the block, so there is no fear that someone will get confused by this implicitness.</p>
<p style="margin:0px 0px 1.2em!important">This implicitness will make stuff like logging context, which is far from a niche use case, much more elegant.</p>
<div title="MDH:SXMgdGhlcmUgYSByZWFzb24gbm90IHRvIGFsbG93IGltcGxpY2l0wqBVbm5hbWVkIFZhcmlhYmxl
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ZGVjbGFyZWQgaW4gdGhlIGRlY2xhcmF0aW9uIG9mIHRoZSBibG9jaywgc28gdGhlcmUgaXMgbm8g
ZmVhciB0aGF0IHNvbWVvbmUgd2lsbCBnZXQgY29uZnVzZWQgYnkgdGhpcyBpbXBsaWNpdG5lc3Mu
PC9kaXY+PGRpdj48YnI+PC9kaXY+PGRpdj5UaGlzIGltcGxpY2l0bmVzcyB3aWxsIG1ha2Ugc3R1
ZmYgbGlrZSBsb2dnaW5nIGNvbnRleHQsIHdoaWNoIGlzIGZhciBmcm9tIGEgbmljaGUgdXNlIGNh
c2UsIG11Y2ggbW9yZSBlbGVnYW50LjwvZGl2Pg==" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0"></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 21, 2023 at 9:17 PM Mark Reinhold <<a href="mailto:mark.reinhold@oracle.com">mark.reinhold@oracle.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><a href="https://openjdk.org/jeps/443" rel="noreferrer" target="_blank">https://openjdk.org/jeps/443</a><br>
<br>
Summary: Enhance the Java language with unnamed patterns, which match<br>
a record component without stating the component's name or type,<br>
and unnamed variables, which can be initialized but not used. Both<br>
are denoted by an underscore character, _. This is a preview language<br>
feature.<br>
<br>
- Mark</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">Holo The Wise Wolf Of Yoitsu</div></div>