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Main.java電話からシリアル入力を取得するこのプログラムを呼び出しました。問題は、数字が正しく表示されることですが、関数BGMusicmaindc()は条件付きで与えられifます (IE if inputLineis 1 play BGMusicmaindc())。しかし、押されたすべてのキーに対して音楽を再生しています。また、elseステートメントは、見つかった場合はノーというエラーを出します。

注: コードは にありpublic synchronized void serialEvent(SerialPortEvent oEvent)ます。

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.File;
import java.io.FileInputStream;
import java.lang.String;
import java.util.Enumeration;
import javax.swing.JOptionPane;
import sun.audio.AudioData;
import sun.audio.AudioDataStream;
import sun.audio.AudioPlayer;
import sun.audio.AudioStream;


public class Main implements SerialPortEventListener
{
    SerialPort serialPort;
        /** The port we're normally going to use. */
    private static final String PORT_NAMES[] = {
            "COM30", // Windows
    };
    /**
    * A BufferedReader which will be fed by a InputStreamReader
    * converting the bytes into characters
    * making the displayed results code page independent
    */
    public BufferedReader input;
    /** The output stream to the port */
    public OutputStream output;
    /** Milliseconds to block while waiting for port open */
    private static final int TIME_OUT = 2000;
    /** Default bits per second for COM port. */
    private static final int DATA_RATE = 9600;

    public void initialize() {
        CommPortIdentifier portId = null;
        Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

        //First, Find an instance of serial port as set in PORT_NAMES.
        while (portEnum.hasMoreElements()) {
            CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
            for (String portName : PORT_NAMES) {
                if (currPortId.getName().equals(portName)) {
                    portId = currPortId;
                    break;
                }
            }
        }
        if (portId == null) {
            System.out.println("Could not find COM port.");
            return;
        }

        try {
            // open serial port, and use class name for the appName.
            serialPort = (SerialPort) portId.open(this.getClass().getName(),
                    TIME_OUT);

            // set port parameters
            serialPort.setSerialPortParams(DATA_RATE,
                    SerialPort.DATABITS_8,
                    SerialPort.STOPBITS_1,
                    SerialPort.PARITY_NONE);

            // open the streams
            input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
            output = serialPort.getOutputStream();

            // add event listeners
            serialPort.addEventListener(this);
            serialPort.notifyOnDataAvailable(true);
        } catch (Exception e) {
            System.err.println(e.toString());
        }
    }

    /**
     * This should be called when you stop using the port.
     * This will prevent port locking on platforms like Linux.
     */
    public synchronized void close() {
        if (serialPort != null) {
            serialPort.removeEventListener();
            serialPort.close();
        }
    }

    /**
     * Handle an event on the serial port. Read the data and print it.
     */
        public static String inputLine;
    public synchronized void serialEvent(SerialPortEvent oEvent) {
        if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
            try {
                inputLine=input.readLine();
                                System.out.println(inputLine);

                                if (Main.inputLine.equals("1"));
                        {
                           BGMusicmaindc();
                        }
else
    System.out.println("");
            }
                        catch (Exception e) {
            //  System.err.println(e.toString());

            }
        }
        // Ignore all the other eventTypes, but you should consider the other ones.
    }

        public void BGMusicmaindc() { //Plays the background music
            //make a new AudioPlayer.
              AudioPlayer mynewBackgroundPlayer = AudioPlayer.player;

              AudioDataStream myLooop = null;
            //use a try block in case the file doesn't exist.
              try {
              AudioStream mynewBackgroundMusic = new AudioStream(new FileInputStream(new File(getClass().getResource(
                      "welcome.wav").toURI())));
              AudioData mynewData = mynewBackgroundMusic.getData();
              myLooop = new AudioDataStream(mynewData);
              }
              catch(Exception error) {JOptionPane.showMessageDialog(null, "Invalid file!");}

              // play background music.
              mynewBackgroundPlayer.start(myLooop);
        }

    public static void main(String[] args) throws Exception {
        Main main = new Main();
        main.initialize();
        Thread t=new Thread() {
            public void run() {
                //the following line will keep this app alive for 1000 seconds,
                //waiting for events to occur and responding to them (printing incoming messages to console).
                try {Thread.sleep(1000000);} catch (InterruptedException ie) {}
            }
        };
        t.start();
        System.out.println("Started");
    }
}
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1 に答える 1

5

ifこれは、ステートメントが機能しない場合によく見られるエラーです。;この条件ステートメントの を削除すると、意図したとおりに機能するはずです。

if (Main.inputLine.equals("1"));  // <---- remove that ;
{
    BGMusicmaindc();
}

注：簡単なifステートメントを使用することもできます（私の個人的な好み）：

if (Main.inputLine.equals("1")) BGMusicmaindc();
于 2013-03-30T15:20:04.473 に答える