java - try-with-resources 中的 catch 是否覆盖了括号中的代码？

Question

不清楚documentation try-with-resources 之后的 catch 是否覆盖了初始化部分。

换句话说，给定这段代码:

    try (InputStream in = getSomeStream()) {
        System.out.println(in.read());
    } catch (IOException e) {
        System.err.println("IOException: " + e.getMessage());
    }

如果在 getSomeStream() 中抛出 IOException，是否会调用我的 catch？

或者 catch 是否只覆盖大括号内的 block ，即 System.out.println(in.read())？

Answer 1

来自JLS ，您的示例是扩展的 try-with-resources。

A try-with-resources statement with at least one catch clause and/or a finally clause is called an extended try-with-resources statement.

在那种情况下:

The effect of the translation is to put the resource specification "inside" the try statement. This allows a catch clause of an extended try-with-resources statement to catch an exception due to the automatic initialization or closing of any resource.

是的，异常将被您的 catch block 捕获。