Java IO Tutorial - Java PushbackReader(Reader in, int size) Constructor

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Syntax

PushbackReader(Reader in, int size) constructor from PushbackReader has the following syntax.

public PushbackReader(Reader in,    int size)

Example

In the following code shows how to use PushbackReader.PushbackReader(Reader in, int size) constructor.

/* w  w  w  . j a v a2  s  .co m*/
import java.io.*;

public class Main {

   public static void main(String[] args) {

      String s = "from java2s.com";

      StringReader sr = new StringReader(s);

      // create a new PushBack reader based on our string reader
      PushbackReader pr = new PushbackReader(sr, 20);

      try {
         // read the first five chars
         for (int i = 0; i < 5; i++) {
            char c = (char) pr.read();
            System.out.println(c);
         }
         // unread a character
         pr.unread('F');

         // read the next char, which is the one we unread
         char c = (char) pr.read();

         System.out.println( c);

         pr.close();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

The code above generates the following result.

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