java - 资源是在 finally 之前还是之后关闭？

Question

在 Java 7 的 try-with-resources 中，我不知道 finally block 和自动关闭发生的顺序。顺序是什么？

BaseResource b = new BaseResource(); // not auto-closeable; must be stop'ed
try(AdvancedResource a = new AdvancedResource(b)) {

}
finally {
    b.stop(); // will this happen before or after a.close()?
}

Answer 1

资源在 catch 或 finally 阻塞之前关闭。看到这个tutorial .

A try-with-resources statement can have catch and finally blocks just like an ordinary try statement. In a try-with-resources statement, any catch or finally block is run after the resources declared have been closed.

评估这是一个示例代码:

class ClosableDummy implements Closeable {
    public void close() {
        System.out.println("closing");
    }
}

public class ClosableDemo {
    public static void main(String[] args) {
        try (ClosableDummy closableDummy = new ClosableDummy()) {
            System.out.println("try exit");
            throw new Exception();
        } catch (Exception ex) {
            System.out.println("catch");
        } finally {
            System.out.println("finally");
        }


    }
}

输出:

try exit
closing
catch
finally