如果实现了AutoCloseable，则帮助调用close（）的助手吗？

Question

Is there any helper method in the JDK or common libraries that does this:

if (resource instanceof AutoCloseable) {
    ((AutoCloseable) resource).close();
}

Just a one-liner to call an object's close() if applicable.

I know about try-with-resources, that's not applicable to this situation. And I know that not all classes that have a close() method implement AutoCloseable . But, I seem to write the above over and over..

Answer 1

There's something Apache Commons offers:

http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/IOUtils.html#closeQuietly(java.io.Closeable)

Answer 2

Here is apache commons closeQuietly adapted for AutoCloseable:

  static void closeQuietly(AutoCloseable closeable) {
    try {
      if (closeable != null) {
        closeable.close();
      }
    }
    catch (Exception swallowed) {
    }
  }

since google sent me here for that case :)

Answer 3

Edit :

Check this:

class CloserHelper
{
    public static void close(Object object)
    {
        if (object instanceof AutoCloseable)
        {
            try
            {
                ((AutoCloseable) object).close();
            }
            catch (Exception ignored) { }
        }
    }
}

---

I can think to something like this

class CloserHelper
{
    public static void close(AutoCloseable obj) throws Exception
    {
        obj.close();
    }
}

Then

CloserHelper.close(resource);

If the object is not a AutoCloseable you cannot just call it

---

If you want to ignore exceptions

class CloserHelper
{
    public static void close(AutoCloseable obj)
    {
        try
        {
            obj.close();
        }
        catch (Exception e) { }
    }
}