What is the use of write UTF method

writeUTF() method is available in java.io package. writeUTF() method is used to write the given string value to the basic data output stream with the help of updated encoding scheme UTF-8.

What is the use of write UTF method in Java?

writeUTF. Writes a string to the underlying output stream using modified UTF-8 encoding in a machine-independent manner. First, two bytes are written to the output stream as if by the writeShort method giving the number of bytes to follow.

What is DataInputStream and DataOutputStream in Java?

The DataInputStream class read primitive Java data types from an underlying input stream in a machine-independent way. While the DataOutputStream class write primitive Java data types to an output stream in a portable way.

What is the use of readUTF and writeUTF ()?

3 Answers. The writeUTF() and readUTF() write the length of the String (in bytes, when encoded as UTF-8) followed by the data, and use a modified UTF-8 encoding.

What is the difference between DataOutputStream and OutputStream?

DataOutputStream can only handle basic types. It can only read/write primtive types and Strings. DataInput/OutputStream performs generally better because its much simpler. ObjectInput/OutputStream can read/write any object type was well as primitives.

What UTF-8 means?

UTF-8 (UCS Transformation Format 8) is the World Wide Web’s most common character encoding. Each character is represented by one to four bytes. UTF-8 is backward-compatible with ASCII and can represent any standard Unicode character.

What is full form of UTF?

Stands for “Unicode Transformation Format.” UTF refers to several types of Unicode character encodings, including UTF-7, UTF-8, UTF-16, and UTF-32. UTF-7 – uses 7 bits for each character. It was designed to represent ASCII characters in email messages that required Unicode encoding.

What is flush Java?

The flush() method of PrintWriter Class in Java is used to flush the stream. By flushing the stream, it means to clear the stream of any element that may be or maybe not inside the stream.

What is readUTF in Java?

The java. io. DataInputStream. readUTF() method reads in a string that has been encoded using a modified UTF-8 format. The string of character is decoded from the UTF and returned as String.

Which class is used to create TCP server?

TCP server-socket programming is almost as simple as client socket programming. A single class (ServerSocket) is used to create and manage TCP client socket connections. The ServerSocket binds to a port and waits for new TCP client connections.

Article first time published on

Why do we use DataOutputStream?

A data output stream lets an application write primitive Java data types to an output stream in a portable way. An application can then use a data input stream to read the data back in.

Why do we use DataInputStream?

A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way. An application uses a data output stream to write data that can later be read by a data input stream. DataInputStream is not necessarily safe for multithreaded access.

What is an advantage of using a DataOutputStream?

DataOutputStream makes sure the data is formatted in a platform independent way. This is the big benefit. It makes sure the party on the other side will be able to read it.

What is InputStream and OutputStream?

The InputStream is used to read data from a source and the OutputStream is used for writing data to a destination. Here is a hierarchy of classes to deal with Input and Output streams.

What is difference between file and stream?

A file can be, for example, a data set that you can read and write repeatedly (such as a disk file), a stream of bytes generated by a program (such as a pipeline), or a stream of bytes received from or sent to a peripheral device (such as the keyboard or display). The latter two are interactive files.

What is the use of the PrintStream class in Java IO?

A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently. Unlike other output streams, a PrintStream never throws an IOException; instead, exceptional situations merely set an internal flag that can be tested via the checkError method.

How many types of UTF are there?

There are three different Unicode character encodings: UTF-8, UTF-16 and UTF-32. Of these three, only UTF-8 should be used for Web content. The HTML5 specification says “Authors are encouraged to use UTF-8.

Where is UTF-32 used?

The main use of UTF-32 is in internal APIs where the data is single code points or glyphs, rather than strings of characters.

What is charset name?

Charset names generally follow the conventions documented in RFC 2278: IANA Charset Registration Procedures. Every charset has a canonical name and may also have one or more aliases. The canonical name is returned by the name method of this class. Canonical names are, by convention, usually in upper case.

What is UTF-16 encoding?

UTF-16 is an encoding of Unicode in which each character is composed of either one or two 16-bit elements. Unicode was originally designed as a pure 16-bit encoding, aimed at representing all modern scripts. … UTF-16 allows access to about 60 000 characters as single Unicode 16-bit units.

Does UTF-8 support extended ascii?

UTF-8 will result in one or two bytes per character in an extended ASCII string. Extended ASCII will always use exactly one byte per character.

What is the difference between Ascii and UTF-8?

UTF-8 encodes Unicode characters into a sequence of 8-bit bytes. … By comparison, ASCII (American Standard Code for Information Interchange) includes 128 character codes. Eight-bit extensions of ASCII, (such as the commonly used Windows-ANSI codepage 1252 or ISO 8859-1 “Latin -1”) contain a maximum of 256 characters.

What is Java IO EOFException?

java.io.EOFException. Signals that an end of file or end of stream has been reached unexpectedly during input. This exception is mainly used by data input streams to signal end of stream. Note that many other input operations return a special value on end of stream rather than throwing an exception.

What is readLine () in Java?

The readLine() method of Console class in Java is used to read a single line of text from the console. Syntax: public String readLine() Parameters: This method does not accept any parameter. Return value: This method returns the string containing the line that is read from the console.

What is DataInputStream class in Java?

Introduction. The Java.io.DataInputStream class lets an application read primitive Java data types from an underlying input stream in a machine-independent way.Following are the important points about DataInputStream − An application uses a data output stream to write data that can later be read by a data input stream.

What is close () in Java?

The close() method of Reader Class in Java is used to close the stream and release the resources that were busy in the stream, if any. … If the stream is open, it closes the stream releasing the resources. If the stream is already closed, it will have no effect.

What is io flush?

Writer. flush() method flushes the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it.

What is flush C#?

Flush() Clears buffers for this stream and causes any buffered data to be written to the file.

What are Java sockets?

Definition: A socket is one endpoint of a two-way communication link between two programs running on the network. … The java.net package in the Java platform provides a class, Socket , that implements one side of a two-way connection between your Java program and another program on the network.

What is TCP client and server?

The “Client” in a TCP/IP connection is the computer or device that “dials the phone” and the “Server” is the computer that is “listening” for calls to come in. … The connection between a Client and a Server remains open until either the client or the server terminates the connection (i.e. hangs up the phone).

What is socket and socket programming?

What is socket programming? Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket(node) listens on a particular port at an IP, while other socket reaches out to the other to form a connection. Server forms the listener socket while client reaches out to the server.