import javax.microedition.midlet.*;import javax.microedition.io.*;import javax.microedition.lcdui.*;import java.io.*;public class Sender extends Thread {    private OutputStream os;    private String message;    public Sender(OutputStream os) {        /*得到父類的輸出流*/        this.os = os;        start();    }    public synchronized void send(String msg) {        /*得到父類的傳輸值*/        message = msg;        notify();    }    public synchronized void run() {        while(true) {            /*如果傳輸的數據沒有被接收，則等待*/            if (message == null) {                try {                    wait();                } catch (InterruptedException e) {                }            }            if (message == null) {                break;            }/*利用輸出流傳出數據，如果傳到了目的端，則結束傳輸*/            try {                os.write(message.getBytes());               os.write("\n".getBytes());               stop();             } catch (IOException ioe) {                ioe.printStackTrace();            }            /* 標記，以用來重新傳輸*/           message = null;        }    }/*結束傳輸*/    public synchronized void stop() {        message = null;        notify();    }}