What throws an IOException in Java

Question

java io IOException seems to be the most common type of exception  and coincidentally  it seems to also be the most ambiguous  I keep seeing the throws IOException whenever writing with sockets  files  etc  I ve never actually had one fired on me  however  so I m wondering what it is that is supposed to fire the exception  The documentation isn t very helpful in explaining what s going on   Signals that an I O exception of some sort has occurred  This class is the general class of exceptions produced by failed or interrupted I O operations   What are some instances where an IOException would be thrown  and how is it supposed to be used

User · Answer

In general  I O means Input or Output  Those methods throw the IOException whenever an input or output operation is failed or interpreted  Note that this won t be thrown for reading or writing to memory as Java will be handling it automatically  Here are some cases which result in IOException   Reading from a closed inputstream Try to access a file on the Internet without a network connection

User · Answer

Assume you were   Reading a network file and got disconnected  Reading a local file that was no longer available  Using some stream to read data and some other process closed the stream  Trying to read write a file  but don t have permission  Trying to write to a file  but disk space was no longer available   There are many more examples  but these are the most common  in my experience

User · Answer

Java documentation is helpful to know the root cause of a particular IOException  Just have a look at the direct known sub-interfaces of IOException from the documentation page  ChangedCharSetException  CharacterCodingException  CharConversionException  ClosedChannelException  EOFException  FileLockInterruptionException  FileNotFoundException  FilerException  FileSystemException  HttpRetryException  IIOException  InterruptedByTimeoutException  InterruptedIOException  InvalidPropertiesFormatException  JMXProviderException  JMXServerErrorException  MalformedURLException  ObjectStreamException  ProtocolException  RemoteException  SaslException  SocketException  SSLException  SyncFailedException  UnknownHostException  UnknownServiceException  UnsupportedDataTypeException  UnsupportedEncodingException  UserPrincipalNotFoundException  UTFDataFormatException  ZipException Most of these exceptions are self-explanatory  A few IOExceptions with root causes  EOFException  Signals that an end of file or end of stream has been reached unexpectedly during input  This exception is mainly used by data input streams to signal the end of the stream  SocketException  Thrown to indicate that there is an error creating or accessing a Socket  RemoteException  A RemoteException is the common superclass for a number of communication-related exceptions that may occur during the execution of a remote method call  Each method of a remote interface  an interface that extends java rmi Remote  must list RemoteException in its throws clause  UnknownHostException  Thrown to indicate that the IP address of a host could not be determined  you may not be connected to Internet   MalformedURLException  Thrown to indicate that a malformed URL has occurred  Either no legal protocol could be found in a specification string or the string could not be parsed

[java] What throws an IOException in Java?

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