PushbackReader unread Example
PushbackReader class unread example. This example shows you how to use unread method.
PushbackReader class unread example.public void unread(int c) throws IOException Pushes back a single character by copying it to the front of the pushback buffer.
Here is the code
/**
* @ # Unread2.java
* A class repersenting use to unread method
* of PipedWriter class in java.io package
* version 31 May 2008
* author Rose India
*/
import java.io.*;
public class Unread2 {
public static void main(String args[]) throws Exception {
// Create a new instance of a PushbackReader object with an
// underlying StringReader buffer.
String s = "This is the internal buffer of StringReader.";
StringReader stringReader = new StringReader(s);
PushbackReader reader = new PushbackReader(stringReader, 100);
// Read from the underlying StringReader buffer.
char[] arr = new char[s.length()];
if (reader.ready()) {
reader.read(arr, 0, arr.length);
}
System.out.println(arr);
// "Unread" some of the data read from the underlying
// StringReader buffer.
String newS = "Replacement internal buffer.";
for (int i = 0; i < newS.length(); i++) {
reader.unread(newS.charAt(i));
}
// Close the PushbackReader object and the underlying
// StringReader object.
stringReader.close();
reader.close();
}
} |
Output
| This is the internal buffer of StringReader. |
|
