Java IO special streams usage
Skip Read Part File Summary: In this tutorial "Skip Read Part File", you learn to skip a few bytes in a file and read the remaining bytes. In all the previous examples, the whole file is read from start to end. Java also permits to skip a few bytes in the file and read from …
SequenceInputStream Java is used to copy a number of source files to one destination file. Many input streams are concatenated and converted into a single stream and copied at a stretch to the destination file. Merging of multiple files can be done easily in Java using SequenceInputStream. SequenceInputStream is a good example to show that …
Read bytes ByteArrayInputStream Summary: By the end of this tutorial "Read bytes ByteArrayInputStream", you will come to know to read a byte array. The byte array can be read fully or a few elements. Two separate programs given. This class is very useful to read data from byte arrays. For example, in UDP protocol, the …
The class ByteArrayOutputStream does just the opposite functionality of ByteArrayInputStream. The ByteArrayInputStream reads data from the array and now the ByteArrayOutputStream writes the data to the byte array. All the characters of the array can be written or a few also. In the following program, both functionalities are illustrated. import java.io.*; public class BAODemo { …
Rereading from the Same Position The same contents of a file can be again and again read by marking the position with the methods of StringBufferInputStream, inherited from its super class InputStream. A file can be reread (reading again) from a particular location. Here, the file position is marked; execution control is taken back to …
StringBufferInputStream Example: As in the earlier program, where the source of reading is a byte array in case of ByteArrayInputStream, now the source is a string buffer in case of StringBufferInputStream. That is, StringBufferInputStream reads from a string buffer (or the other way, string). StringBufferInputStream class methods and constructors are deprecated (observe the compiler message …
The PrintStream is designed to print data at DOS prompt with its print() and println() methods. This stream comes with the ability of automatic flushing of data. In contrary to the methods of all I/O streams, the methods of PrintStream class do not throw IOException. PrintStream methods are deprecated in favor of PrintWriter, but not …
Like StringWriter stores data in a StringBuffer, the CharArrayWriter stores data in a character array. The array size increases implicitly when more data is added. The data stored with CharArrayWriter object can be obtained using toString() or toCharArray() methods. The ealier closing of CharArrayWriter object does not have any affect on the data it stored. …
In the filter streams Java category, the java.io package comes with 4 classes – FilterInputStream and FilterOutputStream on byte stream side and FilterReader and FilterWriter on character streams side. All the subclasses of these 4 classes are known as filter streams. What are filter input streams? As you can see in the following hierarchies, there …
Give Line Numbers LineNumberInputStream Summary: By the end of this tutorial "Give Line Numbers LineNumberInputStream", you will come to know how to give line numbers using Java I/O streams. LineNumberInputStream is a subclass of FilterInputStream stream. We know each filter stream adds some extra functionality. The LineNumberInputStream does the extra work of adding line numbers …
PipedInputStream PipedOutputStream – Transferring Data between Processes What is pipe? A pipe is a transferring channel though which data flows. Pipe is a conduit to send data of an output stream to an input stream. Generally, a thread connected to PipedOutputStream sends data to another thread connected to PipedInputStream. To transfer data between two running …
StringWriter Example: It is a character stream on writing-side which is capable to store data written to it. Internally it uses StringBuffer to store the data. The data written to StringWriter object can be used later in the program. Following is the class signature public class StringWriter extends Writer StringWriter Example: Writing and Extracting with …
StringReader of character streams is equivalent to StringBufferInputStream of byte streams. We know earlier, the StringBufferInputStream methods are deprecated in favor of StringReader. Like StringBufferInputStream, the source of data for StringReader is a string. StringReader supports mark() and reset() methods, but StringBufferInputStream does not support. Being character stream, the StringReader operates on Unicode data. Following …
The character stream LineNumberReader is equivalent to LineNumberInputStream on byte streams side. Being a subclass of BufferedReader, it can make use of all the methods of BufferedReader like readLine() to read a line. getLineNumber() method of this class can be used to give line numbers. Following is the class signature of LineNumberReader Java: public class …
The CharArrayReader is equivalent to ByteArrayInputStream. For ByteArrayInputStream, the source is a byte array and for CharArrayReader the source is a character array. The CharArrayReader reads characters from a character array either completely or partially starting from a offset. This classes supports mark() and reset() methods. Following is the class signature public class CharArrayReader extends …
PushbackReader Java is a character reader stream. It comes with the capability of pushing a character back to the stream. It is the only subclass of FilterReader. Following is the class signature public class PushbackReader extends FilterReader Program that Pushes and Reads Using PushbackReader Java The following program pushes a character back to the stream. …
PrintWriter Example Formatting Data Organizing or customizing the data, the way user wants, is known as formatting the data. PrintWriter class comes with methods to format the data and write to the output stream (not only DOS prompt) as text. This class also contains the methods of PrintStream like print() and println(). This class cannot …
Piping Data PipedReader PipedWriter Summary: By the end you read this tutorial "Piping Data PipedReader PipedWriter", you will understand passing data between two running processes or threads. The PipedReader and PipedWriter are character streams. Similar in byte streams are PipedInputStream and PipedOutputStream. These streams use a concept called pipe. Pipe is used to pass data …
