Interface AutoCloseable

All Known Subinterfaces:
Arena,AsynchronousByteChannel,AsynchronousChannel,BaseStream<T,S>,ByteChannel,CachedRowSet,CallableStatement,Channel,Clip,Closeable,Connection,DataLine,DirectoryStream<T>,DoubleStream,EventStream,ExecutionControl,ExecutorService,FilteredRowSet,GatheringByteChannel,ImageInputStream,ImageOutputStream,InterruptibleChannel,IntStream,JavaFileManager,JdbcRowSet,JMXConnector,JoinRowSet,Line,LongStream,MidiDevice,MidiDeviceReceiver,MidiDeviceTransmitter,Mixer,ModuleReader,MulticastChannel,NetworkChannel,ObjectInput,ObjectOutput,Port,PreparedStatement,ReadableByteChannel,Receiver,ResultSet,RMIConnection,RowSet,ScatteringByteChannel,ScheduledExecutorService,SecureDirectoryStream<T>,SeekableByteChannel,Sequencer,SourceDataLine,StandardJavaFileManager,Statement,Stream<T>,SyncResolver,Synthesizer,TargetDataLine,Transmitter,WatchService,WebRowSet,WritableByteChannel
All Known Implementing Classes:
AbstractExecutorService,AbstractInterruptibleChannel,AbstractSelectableChannel,AbstractSelector,AsynchronousFileChannel,AsynchronousServerSocketChannel,AsynchronousSocketChannel,AudioInputStream,BufferedInputStream,BufferedOutputStream,BufferedReader,BufferedWriter,ByteArrayInputStream,ByteArrayOutputStream,CharArrayReader,CharArrayWriter,CheckedInputStream,CheckedOutputStream,CipherInputStream,CipherOutputStream,DatagramChannel,DatagramSocket,DataInputStream,DataOutputStream,DeflaterInputStream,DeflaterOutputStream,DigestInputStream,DigestOutputStream,DirectExecutionControl,FileCacheImageInputStream,FileCacheImageOutputStream,FileChannel,FileImageInputStream,FileImageOutputStream,FileInputStream,FileLock,FileOutputStream,FileReader,FileSystem,FileWriter,FilterInputStream,FilterOutputStream,FilterReader,FilterWriter,ForkJoinPool,Formatter,ForwardingJavaFileManager,GZIPInputStream,GZIPOutputStream,HttpClient,HttpExchange,HttpsExchange,ImageInputStreamImpl,ImageOutputStreamImpl,InflaterInputStream,InflaterOutputStream,InputStream,InputStreamReader,JarFile,JarInputStream,JarOutputStream,JdiDefaultExecutionControl,JdiExecutionControl,JShell,LineNumberInputStream,LineNumberReader,LocalExecutionControl,LogStream,MemoryCacheImageInputStream,MemoryCacheImageOutputStream,MulticastSocket,ObjectInputStream,ObjectOutputStream,OutputStream,OutputStreamWriter,Pipe.SinkChannel,Pipe.SourceChannel,PipedInputStream,PipedOutputStream,PipedReader,PipedWriter,PrintStream,PrintWriter,ProgressMonitorInputStream,PushbackInputStream,PushbackReader,RandomAccessFile,Reader,Recording,RecordingFile,RecordingStream,RemoteExecutionControl,RemoteRecordingStream,RMIConnectionImpl,RMIConnectionImpl_Stub,RMIConnector,RMIJRMPServerImpl,RMIServerImpl,Scanner,ScheduledThreadPoolExecutor,SctpChannel,SctpMultiChannel,SctpServerChannel,SelectableChannel,Selector,SequenceInputStream,ServerSocket,ServerSocketChannel,Socket,SocketChannel,SSLServerSocket,SSLSocket,StreamingExecutionControl,StringBufferInputStream,StringReader,StringWriter,StructuredTaskScopePREVIEW,StructuredTaskScope.ShutdownOnFailurePREVIEW,StructuredTaskScope.ShutdownOnSuccessPREVIEW,SubmissionPublisher,ThreadPoolExecutor,URLClassLoader,Writer,XMLDecoder,XMLEncoder,ZipFile,ZipInputStream,ZipOutputStream
public interfaceAutoCloseable
An object that may hold resources (such as file or socket handles) until it is closed. Theclose() method of anAutoCloseable object is called automatically when exiting a try-with-resources block for which the object has been declared in the resource specification header. This construction ensures prompt release, avoiding resource exhaustion exceptions and errors that may otherwise occur.
API Note:

It is possible, and in fact common, for a base class to implement AutoCloseable even though not all of its subclasses or instances will hold releasable resources. For code that must operate in complete generality, or when it is known that theAutoCloseable instance requires resource release, it is recommended to use try-with-resources constructions. However, when using facilities such asStream that support both I/O-based and non-I/O-based forms,try-with-resources blocks are in general unnecessary when using non-I/O-based forms.

Since:
1.7

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    Closes this resource, relinquishing any underlying resources.

  • Method Details

    • close

      void close() throwsException
      Closes this resource, relinquishing any underlying resources. This method is invoked automatically on objects managed by thetry-with-resources statement.
      API Note:
      While this interface method is declared to throw Exception, implementers arestrongly encouraged to declare concrete implementations of theclose method to throw more specific exceptions, or to throw no exception at all if the close operation cannot fail.

      Cases where the close operation may fail require careful attention by implementers. It is strongly advised to relinquish the underlying resources and to internallymark the resource as closed, prior to throwing the exception. The close method is unlikely to be invoked more than once and so this ensures that the resources are released in a timely manner. Furthermore it reduces problems that could arise when the resource wraps, or is wrapped, by another resource.

      Implementers of this interface are also strongly advised to not have theclose method throwInterruptedException. This exception interacts with a thread's interrupted status, and runtime misbehavior is likely to occur if an InterruptedException issuppressed. More generally, if it would cause problems for an exception to be suppressed, theAutoCloseable.close method should not throw it.

      Note that unlike theclose method ofCloseable, thisclose method isnot required to be idempotent. In other words, calling thisclose method more than once may have some visible side effect, unlikeCloseable.close which is required to have no effect if called more than once. However, implementers of this interface are strongly encouraged to make theirclose methods idempotent.

      Throws:
      Exception - if this resource cannot be closed