The readChar() method of DataInputStream class in Java is used to read two input bytes and returns a char value. This method basically reads the bytes as character that are written by writechar() method of DataOutputStream class.
Syntax:
public final char readChar()
throws IOException
Specified By: This method is specified by readChar() method of DataInput interface.
Parameters: This method does not accept any parameter.
Return value: This method returns the char value interpreted by the two bytes of input stream.
Exceptions:
- EOFException – It throws EOFException if the input stream is ended before two bytes can be read.
- IOException – This method throws IOException if the stream is closed or some other I/O error occurs.
Below programs illustrate readChar() method in DataInputStream class in IO package:
Program 1: Assume the existence of file “demo.txt”.
// Java program to illustrate// DataInputStream readChar() methodimport java.io.*;public class GFG { public static void main(String[] args) throws IOException { // Create byte array byte[] buf = { 71, 69, 69, 75, 83 }; // Create file output stream FileOutputStream outputStream = new FileOutputStream("c:\\demo.txt"); // Create data output stream DataOutputStream dataOutputStr = new DataOutputStream(outputStream); for (byte b : buf) { // Write character to // the dataOutputStream dataOutputStr.writeChar(b); } dataOutputStr.flush(); // Create file input stream FileInputStream inputStream = new FileInputStream("c:\\demo.txt"); // Create data input stream DataInputStream dataInputStr = new DataInputStream(inputStream); while (dataInputStr.available() > 0) { // Print character System.out.print( dataInputStr.readChar()); } }} |
Program 2: Assume the existence of file “demo.txt”.
// Java program to illustrate// DataInputStream readChar() methodimport java.io.*;public class GFG { public static void main(String[] args) throws IOException { // Create byte array byte[] buf = { 71, 69, 69, 75, 83, 70, 79, 82, 71, 69, 69, 75, 83 }; // Create file output stream FileOutputStream outputStream = new FileOutputStream("c:\\demo.txt"); // Create data output stream DataOutputStream dataOutputStr = new DataOutputStream(outputStream); for (byte b : buf) { // Write character to // the dataOutputStream dataOutputStr.writeChar(b); } dataOutputStr.flush(); // Create file input stream FileInputStream inputStream = new FileInputStream("c:\\demo.txt"); // Create data input stream DataInputStream dataInputStr = new DataInputStream(inputStream); while (dataInputStr.available() > 0) { // Print character System.out.print( dataInputStr.readChar()); } }} |
References:
https://docs.oracle.com/javase/10/docs/api/java/io/DataInputStream.html#readChar()
