File inputstream

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Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Overrides: read in class InputStream Parameters: b - the buffer into which the data is read. Returns: the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached. See Also: InputStream. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned.

Throws: NullPointerException - If b is null. The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly 0. If n is negative, an IOException is thrown, even though the skip method of the InputStream superclass does nothing in this case. The actual number of bytes skipped is returned. This method may skip more bytes than are remaining in the backing file. This produces no exception and the number of bytes skipped may include some number of bytes that were beyond the EOF of the backing file.

Attempting to read from the stream after skipping past the end will result in -1 indicating the end of the file. Overrides: skip in class InputStream Parameters: n - the number of bytes to be skipped.

Returns: the actual number of bytes skipped. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes. In some cases, a non-blocking read or skip may appear to be blocked when it is merely slow, for example when reading large files over slow networks. Overrides: available in class InputStream Returns: an estimate of the number of remaining bytes that can be read or skipped over from this input stream without blocking.

If this stream has an associated channel then the channel is closed as well. Returns: the file descriptor object associated with this stream. The initial position of the returned channel will be equal to the number of bytes read from the file so far. Reading bytes from this stream will increment the channel's position. Changing the channel's position, either explicitly or by reading, will change this stream's file position.

Returns: the file channel associated with this file input stream Since: 1. The FileInputStream class provides implementations for different methods present in the InputStream class. In the above example, we have created a file input stream named input. The input stream is linked with the input. To get the number of available bytes, we can use the available method. For example,. To discard and skip the specified number of bytes, we can use the skip method.

In the above example, we have used the skip method to skip 5 bytes of data from the file input stream. Hence, the bytes representing the text "This " is not read from the input stream.

To close the file input stream, we can use the close method. Once the close method is called, we cannot use the input stream to read data. In all the above examples, we have used the close method to close the file input stream.

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