为什么在Java的try-with-resource中需要声明

您的版本未明确定义应关闭的内容，例如

CloseableResource thing;Parameter a;try (a = (thing = methodThatCreatesAThingAndDoesSomeSideEffect()).getParameter()) {

还要写的话怎么办

try (12) {

或者其他的东西？

也

CloseableResource thing1 = methodThatCreatesAThingAndDoesSomeSideEffect();CloseableResource thing2 = methodThatCreatesAThingAndDoesSomeSideEffect();try(thing1) {}

为什么只关闭

thing1

因此，当前语法迫使您在打开关闭块的同时创建变量。

ALSO2

CloseableResource Thing1 = methodThatCreatesAThingAndDoesSomeSideEffect（）;

try(thing1) {}thing1.doSomethingonClosedResource();

由于

thing1