PushbackReader reset() in Java

reset(): This method is available in the java.io.PushbackReader class of Java.

Syntax:

void java.io.PushbackReader.reset() throws IOException

This method resets the stream. The reset method of PushbackReader always throws an exception.

Parameters: NA

Returns: NA

Throws:

1. IOException - Always, since reset is not supported

Approach

Java

package com.PushbackReader;

import java.io.IOException;
import java.io.PushbackReader;
import java.io.Reader;
import java.io.StringReader;

public class PushbackReaderreset {
    public static void main(String[] args) throws IOException {

        Reader in = new StringReader("HELLO");
        PushbackReader pushbackReader = new PushbackReader(in);

        pushbackReader.reset();
        System.out.println("Successfully reset");

        pushbackReader.close();
    }
}

Output:

Exception in thread "main" java.io.IOException: mark/reset not supported
	at java.base/java.io.PushbackReader.reset(PushbackReader.java:229)
	at com.PushbackReader.PushbackReaderreset.main(PushbackReaderreset.java:14)

Some other methods of PushbackReader

close(): This method closes the stream and releases any system resources associated with it.

mark(int): This method marks the present position in the stream.

markSupported(): This method tells whether this stream supports the mark() operation, which it does not.

PushbackReader(Reader): This method creates a new pushback reader with a one-character pushback buffer.

PushbackReader(Reader, int): This method creates a new pushback reader with a pushback buffer of the given size.

read(): This method reads a single character.

read(char[], int, int): This method reads characters into a portion of an array.

ready(): This method tells whether this stream is ready to be read.

reset(): This method resets the stream.

skip(long): This method skips characters

unread(char[]): This method pushes back an array of characters by copying it to the front of the pushback buffer.

unread(int): This method pushes back a single character by copying it to the front of the pushback buffer.

unread(char[], int, int):  This method pushes back a portion of an array of characters by copying it to the front of the pushback buffer.