好吧,新手学习中,根据书籍《Head Java 1St》代码弄了一个
minimusciplayer,很简单的玩意,只能发一个音
即使是完全照抄代码,还是出问题了,这个Sequencer not open 是咋回事?
用的是7u21,书上用的是 5.0
参看了java se 6.0 的API,没发现怎么Open啊。
minimusciplayer,很简单的玩意,只能发一个音
即使是完全照抄代码,还是出问题了,这个Sequencer not open 是咋回事?
用的是7u21,书上用的是 5.0
参看了java se 6.0 的API,没发现怎么Open啊。
import javax.sound.midi.*;
public class MiniMusicPlayer{
public static void main(String[] args){
MiniMusicPlayer miniplayer = new MiniMusicPlayer();
miniplayer.play();
} public void play(){
try {
Sequencer player = MidiSystem.getSequencer();
Sequence seq = new Sequence(Sequence.PPQ,4);
Track track = seq.createTrack();
ShortMessage a = new ShortMessage();
a.setMessage(144,1,44,100);
MidiEvent noteon =new MidiEvent(a,1);
track.add(noteon); ShortMessage b = new ShortMessage();
b.setMessage(128,1,44,100);
MidiEvent noteoff = new MidiEvent(b,16);
track.add(noteoff); player.setSequence(seq); player.start();
}catch(Exception ex){
ex.printStackTrace();
}
}
}