JAVA EE: Java Tutorial : Java IO (Java PushbackReader)

Wednesday, 19 October 2016

Java Tutorial : Java IO (Java PushbackReader)

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Java Tutorial : Java IO (Java PushbackReader)

myfile.txt

Hello world

PushbackReaderDemo.java

import java.io.FileReader;
import java.io.IOException;
import java.io.PushbackReader;

public class PushbackReaderDemo
{

    public static void main(String[] args) throws IOException
    {
        FileReader fileReader = null;
        PushbackReader pushbackReader = null;
        try
        {
            fileReader = new FileReader("myfile.txt");
            pushbackReader = new PushbackReader(fileReader);
            int data = pushbackReader.read();
            System.out.println((char) data);

            /*
             * Pushes back a single character by copying it
             * to the front of the pushback buffer. After
             * this method returns, the next character to be
             * read will have the value (char)c.
             */
            pushbackReader.unread(data);

            /*
             * Reads a single character.
             */
            data = pushbackReader.read();
            System.out.println((char) data);

        }
        finally
        {
            if (pushbackReader != null)
            {
                /*
                 * Closing a PushbackReader will also close
                 * the Reader instance from which the
                 * PushbackReader is reading.
                 */
                pushbackReader.close();
            }
        }

    }

}