This Java tip shows how to use BufferedWriter and BufferedReader classes
with PipedWriter and PipedReader classes to allow communication between two threads.

Java Code:
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.PipedReader;
import java.io.PipedWriter;
import java.io.Reader;
import java.io.Writer;

public class PipedCharacters extends Object {
  public static void writeStuff(Writer rawOut) {
    try {
      BufferedWriter out = new BufferedWriter(rawOut);

      String[][] line = { { "Java", "Source", "and", "Support." }};

      for (int i = 0; i < line.length; i++) {
        String[] word = line[i];

        for (int j = 0; j < word.length; j++) {
          out.write(word[j]);
        }

        out.newLine();
      }

      out.flush();
      out.close();
    } catch (IOException x) {
      x.printStackTrace();
    }
  }

  public static void readStuff(Reader rawIn) {
    try {
      BufferedReader in = new BufferedReader(rawIn);

      String line;
      while ((line = in.readLine()) != null) {
        System.out.println("read line: " + line);
      }

      System.out.println("Read all data from the pipe");
    } catch (IOException x) {
      x.printStackTrace();
    }
  }

  public static void main(String[] args) {
    try {
      final PipedWriter out = new PipedWriter();

      final PipedReader in = new PipedReader(out);

      Runnable runA = new Runnable() {
        public void run() {
          writeStuff(out);
        }
      };

      Thread threadA = new Thread(runA, "threadA");
      threadA.start();

      Runnable runB = new Runnable() {
        public void run() {
          readStuff(in);
        }
      };

      Thread threadB = new Thread(runB, "threadB");
      threadB.start();
    } catch (IOException x) {
      x.printStackTrace();
    }
  }
}