The reset() method of BufferedReader class in Java is used to fix or mark the position at the last marked position so that the same byte can be read again.
Syntax:
public void reset()
throws IOException
Overrides: It overrides the reset() method of Reader class.
Parameters: The method does not accept any parameter.
Return value: The method does not return any value.
Exceptions: The method throws IOException if the mark() method is never called on the stream or if the value of mark is invalid.
Below programs illustrate reset() method in BufferedReader class in IO package:
Program 1: Assume the existence of the file “c:/demo.txt”.
// Java program to illustrate// BufferedReader reset() method import java.io.*; public class GFG { public static void main(String[] args) { // Read the stream 'demo.txt' // for containing text "GEEKS" FileReader fileReader = new FileReader( "c:/demo.txt"); // Convert fileReader to // bufferedReader BufferedReader buffReader = new BufferedReader( fileReader); // Read and print characters // one by one System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); // Mark is set on the stream buffReader.mark(0); System.out.println( "Char : " + (char)buffReader.read()); // Reset() is invoked buffReader.reset(); // Read and print characters System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); }} |
Output:
Char : G Char : E Char : E Char : K Char : K Char : S
Program 2: Assume the existence of the file “c:/demo.txt”.
// Java program to illustrate// BufferedReader reset() methodimport java.io.*;public class GFG { public static void main(String[] args) { // Read the stream 'demo.txt' // containing text "GEEKSFORGEEKS" FileReader fileReader = new FileReader( "c:/demo.txt"); // Convert fileReader to // bufferedReader BufferedReader buffReader = new BufferedReader( fileReader); // Read and print characters // one by one System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); // Mark is set on the stream buffReader.mark(0); System.out.println( "Char : " + (char)buffReader.read()); // Reset() is invoked buffReader.reset(); // read and print characters System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); System.out.println( "Char : " + (char)buffReader.read()); }} |
Output:
Char : G Char : E Char : E Char : K Char : S Char : S Char : F Char : O Char : R
References:
https://docs.oracle.com/javase/10/docs/api/java/io/BufferedReader.html#reset()
