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 …
Performance drawbacks File copying Summary: By the end of this tutorial "Performance drawbacks File copying", you will come to know the reasons of slow performance in file copying. Gives links to other programs to increase speed of copying. Performance drawbacks of FileInputStream and FileOutputStream Following is the for loop used in the FileToFile1.java program. while( …
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 …
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 …
JDK 1.4 is one of the major versions released in February, 2002. The work started on the name of "Project Merlin" and includes the developments to support XML processing, java.nio package addition, Security restrictions, Logging API, JDBC 3.0 API, Assertions, Chained exceptions, Regular expressions and Drag and Drop. Two of these features, Assertions and Regular …
Every version adds new packages and classes. JDK 1.5 version started its work under the code name Project Tiger and the version was released on September, 2004. JDK 1.5 version adds the following features to Java language. JDK 1.5 Features are programmatically very important, as often used. Following list gives the JDK 1.5 Features Autoboxing …
JDK 1.6 JDK 1.7 Versions The work for JDK 1.6 started with the name Project Mustang and released on December, 2006. This version is known as Java SE 6 instead of J2SE. This version includes lot of features in GUI execution speed etc. Following list gives. JDK 1.6 Features (of JDK 1.6 JDK 1.7 Versions) …
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 { …
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. …
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 …
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 …
These two streams are carriers of data to a destination. Both look alike, but they differ in some finer concepts. Basically, the OutputStream class (super class of PrintStream) is an abstract class, JDK 1.0, that includes methods to write a stream of bytes in a sequential order The Writer class (super class of PrintWriter) is …
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. …
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 …
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 …
Bridging byte streams to character streams on writing-side The byte streams and character streams are incompatible for linking as the first one operates on 8-bit ASCII characters and the other on 16-bit Unicode characters. To link them explicitly, two classes exist in java.io package, InputStreamReader and OutputStreamWriter. Towards this functionality, we have seen earlier InputStreamReader …
Speed up Copying Reading and copying file to file is very slow with FileReader and FileWriter as for every byte read, the control should be shifted from the execution context area of source file to the destination file and back again to read the second byte. This is what you have done in Semantics of …
DataInputStream includes many methods like readByte(), readInt(), readLong(), readFloat(), readDouble() and readUTF() etc with which a byte, an integer, a long, a float, a double and a word can be read as a whole. Similarly, the DataOutputStream includes the methods like writeByte(), writeInt(), writeLong(), writeFloat(), writeDouble() and writeUTF() that can write a byte, an integer, …
Using Buffers to Enhance the Performance Buffering of streams increases the performance to higher extents of few thousand times. For buffering, two streams exist in java.io package in byte streams category – BufferedInputStream and BufferedOutputStream. These high-level classes are subclasses of FilterInputStream and FilterOutputStream and their functionality is to increase the performance with buffer. These …
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 …
