java多线程 任务间管道通信

import java.io.IOException; 
import java.io.PipedReader; 
import java.io.PipedWriter; 
import java.util.Random; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 
import java.util.concurrent.TimeUnit; 
class Sender implements Runnable { 
    private Random rand = new Random(47); 
    private PipedWriter out = new PipedWriter(); 
    public PipedWriter getPipedWriter() { 
        return out; 
    } 
    public void run() { 
        try { 
            while (true) { 
                for (char c = 'A'; c <= 'z'; c++) { 
                    out.write(c); 
                    TimeUnit.MILLISECONDS.sleep(rand.nextInt(500)); 
                } 
            } 
        } catch (IOException e) { 
            System.out.println("Sender write exception"); 
        } catch (InterruptedException e) { 
            System.out.println("Sender sleep interrupted"); 
        } 
    } 
} 
class Receiver implements Runnable { 
    private PipedReader in; 
    public Receiver(Sender sender) throws IOException { 
        in = new PipedReader(sender.getPipedWriter()); 
    } 
    public void run() { 
        try { 
            while (true) { 
                System.out.println("Read: " + (char) in.read()); 
            } 
        } catch (IOException e) { 
            System.out.println("Receiver read exception"); 
        } 
    } 
} 
public class PipedIO { 
    public static void main(String[] args) throws Exception { 
        Sender sender=new Sender(); 
        Receiver receiver=new Receiver(sender); 
        ExecutorService exec=Executors.newCachedThreadPool(); 
        exec.execute(sender); 
        exec.execute(receiver); 
        TimeUnit.SECONDS.sleep(15); 
        exec.shutdownNow(); 
    } 
}