PushbackReader(Reader, int): This method is available in the java.io.PushbackReader class of Java.
Syntax:
java.io.PushbackReader.PushbackReader(Reader in, int size)
This method takes two arguments. This method creates a new pushback reader with a pushback buffer of the given size.
Parameters: Two parameters are required for this method.
in: The reader from which characters will be read.
size: The size of the pushback buffer.
Throws:
1. IllegalArgumentException - if size <= 0
Approach 1: When no exception
Java
import java.io.IOException;import java.io.PipedReader;import java.io.PushbackReader;import java.io.Reader;public class PushbackReaderPushbackReader2 {public static void main(String[] args) throws IOException {Reader in = new PipedReader();int size = 10;PushbackReader pushbackReader =new PushbackReader(in, size);System.out.println(pushbackReader);pushbackReader.close();}}
Output:
java.io.PushbackReader@7637f22
Approach 2: IllegalArgumentException
Java
package com.PushbackReader;import java.io.IOException;import java.io.PipedReader;import java.io.PushbackReader;import java.io.Reader;public class PushbackReaderPushbackReader2 {public static void main(String[] args) throws IOException {Reader in = new PipedReader();int size = -10;PushbackReader pushbackReader =new PushbackReader(in, size);System.out.println(pushbackReader);pushbackReader.close();}}
Output:
Exception in thread "main" java.lang.IllegalArgumentException: size <= 0 at java.base/java.io.PushbackReader.<init>(PushbackReader.java:55) at com.PushbackReader.PushbackReaderPushbackReader2.main(PushbackReaderPushbackReader2.java:13)
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.
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