Filter Stream

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A Filter stream filters data as it is being read from or written to the stream. The two filter streams for reading and writing data are Filter input Stream and Filter Output Stream ,respectively. A filter stream is constructed on another stream. This can be achieved by passing an instance of Input Stream or Output Stream to a constructor. This implies that filter streams are chained. Multiple filters can be added by chaining them to a stream of bytes. The read method in a readable filter stream reads input from the underlying stream, filters it and passes on the filtered data to the caller. The write method in a writable filter stream filters the data and then writes it to the underlying stream. The filtering done by the streams depends on the stream. Some streams buffer the data, some count data as they go by and others convert data from the original form to a different one. Most filter streams provided by the java. Data input Stream and Data Output Stream Data input Stream Data Output Stream is a filtered input output stream and hence must be attached to some other input output stream. Data input Stream handles reading in data as well as lines of text. Program stores the data which are read from the console in tabular format using Data Output Stream. After that, the program reads the data using the Data input Stream. Read the item name: Although the data are read or written in binary form, they appear on the console as characters. Data Output Stream writes the data in the file. Here, XXX represents a Java data type. Next, Sample Stream opens a Data input Stream. In general, we use null or -1 to indicate the end of the file. Some methods such as read String and read Char in the Data input Stream do not identify null or-1 as an end of file marker. Thus, programmer must be careful while writing loops using Data Input stream for reading characters from a file. The available method of Data input Stream, which returns the number of bytes remaining, can be used to check whether there are any data remaining to read. Push back input Stream Pushback is used on input streams to allow a byte to be read from and returned to the stream. Like all filter streams, Push back input stream is also attached to another stream. It is typically used for some specific implementation, for example, to read the first byte of the data from a stream forth purpose of testing the data. For example, it is mostly required in the case of designing parsers, while reading data, to have glance on the next set of input data. Data must be read and if not found appropriate, it should be placed back into the input stream, which may be read again and processed normally. A Push back input Stream object can be created as follows: The second and the third forms of the method return the byte in a buffer with the difference that the third method pushes back the number of characters numchars starting from the offset. Push back Reader also does the same thing on the character stream. Most Read Article What is Computer? Describe the Commands in DOS? Explain Process Scheduling What is computer Graphics? Top Pages What is Computer? Mail Me At Computer Notes.

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