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Test Stdin Java code example - Click here to copy ->>>

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------------------

Code:

 


package com.ronsoft.books.nio.channels;

import java.nio.ByteBuffer;
import java.nio.channels.Selector;
import java.nio.channels.SelectionKey;
import java.nio.channels.SelectableChannel;
import java.nio.channels.ReadableByteChannel;
import java.util.Iterator;

public class TestStdin
{
   public static void main (String [] argv)
      throws Exception
   {
      Selector selector = Selector.open();
      SystemInPipe stdinPipe = new SystemInPipe();
      SelectableChannel stdin = stdinPipe.getStdinChannel();
      ByteBuffer buffer = ByteBuffer.allocate (32);

      stdin.register (selector, SelectionKey.OP_READ);
      stdinPipe.start();

      System.out.println ("Entering select(), type something:");

      while (true) {
         selector.select (2000);

         Iterator it = selector.selectedKeys().iterator();

         if ( ! it.hasNext()) {
            System.out.println ("I'm waiting");
            continue;
         }

         SelectionKey key = (SelectionKey) it.next();

         it.remove();
         buffer.clear();

         ReadableByteChannel channel =
            (ReadableByteChannel) key.channel();
         int count = channel.read (buffer);

         if (count < 0) {
            System.out.println ("EOF, bye");

            channel.close();
            break;
         }

         buffer.flip();

         System.out.println ("Hey, read " + count + " chars:");

         while (buffer.hasRemaining()) {
            System.out.print ((char) buffer.get());
         }

         System.out.println();
      }
      
   }
}

 
 



References.

The list of classes which were used on this page you can find below. The links to Java API contain official SUN documentation about all used classes.

  java.nio.channels.Selector

  java.lang.Exception

  java.nio.channels.SelectableChannel

  java.nio.ByteBuffer

  java.util.Iterator

  java.nio.channels.SelectionKey

  java.nio.channels.ReadableByteChannel




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