Producer & Consumer ---- a practice in concurrent simulation

import java.util.Arrays;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.TimeUnit;class Write implements Runnable {    private WriteAndRead writeAndRead;    private int p = 0;    private int count = 0;    Write(WriteAndRead wr) {        writeAndRead = wr;    }    @Override    public void run() {        try {            while (!Thread.interrupted()) {                synchronized (this) {                    while (writeAndRead.numbers[p] != null)                        wait();                }                synchronized (writeAndRead.read) {                    System.out.println("write");                    writeAndRead.numbers[p] = p;                    p = (p + 1) % 8;                    ++count;                    writeAndRead.read.notifyAll();                    TimeUnit.MILLISECONDS.sleep(100);                }                if (count > WriteAndRead.END)                    throw new InterruptedException();            }        } catch (InterruptedException e) {            System.out.println("write interrupted.");        }    }}class Read implements Runnable {    private WriteAndRead writeAndRead;    private int p = 0;    private int count = 0;    Read(WriteAndRead wr) {        writeAndRead = wr;    }    @Override    public void run() {        try {            while (!Thread.interrupted()) {                synchronized (this) {                    while (writeAndRead.numbers[p] == null) {                        wait();                    }                }                System.out.println("read ");                TimeUnit.MILLISECONDS.sleep(100);                synchronized (writeAndRead.write) {                    System.out.println(writeAndRead.numbers[p]);                    writeAndRead.numbers[p] = null;                    p = (p + 1) % 8;                    ++count;                    writeAndRead.write.notifyAll();                }                if (count == WriteAndRead.END) {                    System.out.println("end");                    writeAndRead.exce.shutdownNow();                    throw new InterruptedException();                }            }        } catch (InterruptedException e) {            System.out.println("read interrupted.");        }    }}class WriteAndRead {    final Write write = new Write(this);    final Read read = new Read(this);    Integer[] numbers = new Integer[8];    static final int END = 3;    ExecutorService exce = Executors.newCachedThreadPool();    WriteAndRead() {        Arrays.fill(numbers, null);        exce.execute(write);        exce.execute(read);    }    public static void main(String[] args) {        new WriteAndRead();    }}