PushbackInputStream(InputStream, int): This method is available in the java.io.PushbackInputStream class of Java.
Syntax:
java.io.PushbackInputStream.PushbackInputStream(InputStream in, int size)
This method takes two arguments. This method creates a PushbackInputStream with a pushback buffer of the specified size, and saves its argument, the input stream, for later use.
Note: Initially, the pushback buffer is empty.
Parameters: Two parameters are required for this method.
in: the input stream from which bytes will be read.
size: the size of the push back buffer.
Throws:
1. IllegalArgumentException - if size <= 0.
Approach 1: When no exception
Java
import java.io.IOException;import java.io.InputStream;import java.io.PushbackInputStream;public class PushbackInputStreamPushbackInputStream2 {public static void main(String[] args) throws IOException {InputStream in = new InputStream() {@Overridepublic int read() throws IOException {return 10;}};int size = 10;PushbackInputStream pushbackInputStream =new PushbackInputStream(in, size);System.out.println(pushbackInputStream);pushbackInputStream.close();}}
Output:
java.io.PushbackInputStream@4361bd48
Approach 2: IllegalArgumentException
Java
package com.PushbackInputStream;import java.io.IOException;import java.io.InputStream;import java.io.PushbackInputStream;public class PushbackInputStreamPushbackInputStream2 {public static void main(String[] args) throws IOException {InputStream in = new InputStream() {@Overridepublic int read() throws IOException {return 10;}};int size = -10;PushbackInputStream pushbackInputStream =new PushbackInputStream(in, size);System.out.println(pushbackInputStream);pushbackInputStream.close();}}
Output:
Exception in thread "main" java.lang.IllegalArgumentException: size <= 0 at java.base/java.io.PushbackInputStream.<init>(PushbackInputStream.java:92) at com.PushbackInputStream.PushbackInputStreamPushbackInputStream2.main(PushbackInputStreamPushbackInputStream2.java:18)
Some other methods of PushbackInputStream
available(): This method returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking the next invocation of a method for this input stream.
mark(int): This method marks the current position in this input stream.
markSupported(): This method tests if this input stream supports the mark and reset methods, which it does not.
PushbackInputStream(InputStream): This method creates a PushbackInputStream with a 1-byte pushback buffer and saves its argument, the input stream, for later use.
PushbackInputStream(InputStream, int): This method creates a PushbackInputStream with a pushback buffer of the specified size, and saves its argument, the input stream, for later use.
read(): This method reads the next byte of data from this input stream.
read(byte[], int, int): This method reads up to len bytes of data from this input stream into an array of bytes.
reset(): This method repositions this stream to the position at the time the mark method was last called on this input stream.
skip(long): This method skips over and discards n bytes of data from this input stream.
unread(byte[]): This method pushes back an array of bytes by copying it to the front of the pushback buffer.
unread(int): This method pushes back a byte by copying it to the front of the push-back buffer.
unread(byte[], int, int): This method pushes back a portion of an array of bytes by copying it to the front of the pushback buffer.
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