Java PushbackInputStream unread() Example
PushbackInputStream class unread() method example. This example shows you how to use unread() method.
Syntax is : public void unread(int b) throws IOException
This method pushes back a byte by copying it to the front of the pushback buffer. After this method returns, the next byte to be read will have the value (byte)b.
Here is the code.
/**
* @(#) UnreadPushbackInputStream.java
* A class representing use of method unread() of PushbackInputStream
class in java.io Package.
* @Version 10-June-2008
* @author Rose India Team
*/
import java.io.*;
public class UnreadPushbackInputStream {
public static void main(String[] args) throws IOException {
byte[] byteArray = new byte[]{'M', 'A', 'H', 'E', 'N', 'D', 'R', 'A'};
File file = new File("Mahendra.txt");
// Create object of FileOutputStream class for specified file.
FileOutputStream fOutStream = new FileOutputStream(file);
fOutStream.write(byteArray);
// Create object of PushbackInputStream class for specified stream.
InputStream inStream = new FileInputStream(file);
PushbackInputStream pInStream = new PushbackInputStream(inStream);
// read content of the file.
int charValue = pInStream.read();
System.out.println("First char of the stream : " + (char) charValue);
// unread method call.
pInStream.unread(charValue);
System.out.println("unread method call so next char will be first " +
"char.");
System.out.print("Next char of the stream : "+(char) pInStream.read());
}
} |
output of the program.
First char of the stream : M
unread method call so next char will be first char.
Next char of the stream : M |
|
