Why close bufferedreader

Brian Agnew Brian Agnew k 36 36 gold badges silver badges bronze badges. I really want to give this a thumbs up for linking to something concrete, but this only refers to the OpenJDK implementation, and since the JavaDocs are unclear for Reader close , this does not provide concrete evidence that the Oracle JDK, for example, is implemented in a similar fashion.

Given that there is documentation explaining how it should be used, you should look at the documentation first — any deviation in the code is a bug. So, only bReader. Anup Verma Anup Verma 1 1 silver badge 9 9 bronze badges. What the source code shows isn't citable as a reference. It's what the specification says, in this case the Javadoc, that can be relied on.

This is also the case with nested resource statements This is the recomanded way to work with resources, see the documentation for more detailed information.

Claudiu Matei Claudiu Matei 4, 3 3 gold badges 16 16 silver badges 33 33 bronze badges. This is nearly identical to mcdowell's answer from , which also covers some edge-case issues that could occur.

You Only Need to close the bufferedReader i. Jitendra Jitendra 52 8 8 bronze badges. I'm late, but: BufferReader. Dmitry Gashko Dmitry Gashko 80 1 1 silver badge 6 6 bronze badges.

TornaxO7 no, it's not an example code. I just wrote part of java source code. You need to close only the BufferedReader in your scenario. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta.

Now live: A fully responsive profile. Linked 4. See more linked questions. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. Accept all cookies Customize settings. A limit value larger than the size of the input buffer will cause a new buffer to be allocated whose size is no smaller than limit.

Therefore large values should be used with care. Overrides: reset in class Reader Throws: IOException - If the stream has never been marked, or if the mark has been invalidated close public void close throws IOException Description copied from class: Reader Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read , ready , mark , reset , or skip invocations will throw an IOException.

Closing a previously closed stream has no effect. The Stream is lazily populated, i. The reader must not be operated on during the execution of the terminal stream operation. Otherwise, the result of the terminal stream operation is undefined. After execution of the terminal stream operation there are no guarantees that the reader will be at a specific position from which to read the next character or line. If an IOException is thrown when accessing the underlying BufferedReader , it is wrapped in an UncheckedIOException which will be thrown from the Stream method that caused the read to take place.

This method will return a Stream if invoked on a BufferedReader that is closed. Any operation on that stream that requires reading from the BufferedReader after it is closed, will cause an UncheckedIOException to be thrown.

That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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Skip navigation links. Object java. Reader java. Field Summary Fields inherited from class java. What happens if you don't close a file python? If you don't close them yourself, Python will eventually close them for you. In some versions of Python, that might be the instant they are no longer being used; in others, it might not happen for a long time.

Under some circumstances, it might not happen at all. Why do we need files? The most important purpose of a file system is to manage user data. This includes storing, retrieving and updating data. Some file systems accept data for storage as a stream of bytes which are collected and stored in a manner efficient for the media. How do you close a scanner? If this scanner has not yet been closed then if its underlying readable also implements the Closeable interface then the readable's close method will be invoked.

If this scanner is already closed then invoking this method will have no effect. Why do we need to close a file in C? A file needs to be closed after a read or write operation to release the memory allocated by the program. In C, a file is closed using the fclose function. This returns 0 on success and EOF in the case of a failure.

An EOF is defined in the library called stdio. Why should a program close a file when its finished using it? A programmer must close the file when it is finished using it because in some systems failure to close an output file can cause loss of data. When it closes it fully disconnects from the file. How do you write to a file in Java? FileWriter: FileWriter is the simplest way to write a file in Java. It provides overloaded write method to write int, byte array, and String to the File.