资源是在最终之前还是之后关闭?
问题内容:
在Java 7的try-with-resources中,我不知道finally块和自动关闭发生的顺序。什么顺序
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()?
}
问题答案:
资源在捕获或最终阻塞之前被关闭。请参阅本教程。
try-with-resources语句可以具有catch并最终阻塞,就像普通的try语句一样。在try-with-
resources语句中,在声明的资源已关闭之后,将运行任何catch或finally块。
要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