Java線程之間通信

import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;


class Businesses implements Runnable {

    private PipedOutputStream pos = null; //用於通信

    public Businesses() {
        pos = new PipedOutputStream();
    }

    @Override
    public void run() {
        try {
            String str = "快來買呀";
            pos.write(str.getBytes());
            pos.close();

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

    public PipedOutputStream getPos() {
        return pos;
    }
}

class Customers implements Runnable {
    private PipedInputStream pis = null;

    public Customers() {
        this.pis = new PipedInputStream();
    }

    @Override
    public void run() {
        try {
            byte[] b = new byte[1024];
            int len =  pis.read(b);
            pis.close();
            System.out.println("收到商家說話："+new String(b,0,len));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public PipedInputStream getPis() {
        return pis;
    }
}


public class PipeDemo {

    public static void main(String[] args) {
        Businesses businesses = new Businesses();
        Customers customers = new Customers();

        if (businesses.getPos() == null|| customers.getPis() ==null ) {
            System.out.println("出現異常；businesses.getPos() == null|| customers.getPis() ==null  ");
            return;
        }
        try {
            businesses.getPos().connect(customers.getPis());
        } catch (IOException e) {
            e.printStackTrace();
        }

        new Thread(businesses).start();
        new Thread(customers).start();

    }
}