我正在设计用于教育目的的钢琴模拟软件。当获得用户输入时，我必须将键盘中的按键绑定到音高。有时按住某个键会产生重复的击键。我想确保按住一个键可以保持音符，而不是快速重复。此外，我想记录笔记保存的时间。最好的方法是什么？
这是我的代码：
public class PianoApplet extends Applet {
@Override
public void init() {
HashSet<Character> set=new HashSet();
final Midi midi;
try {
midi = new Midi();
} catch (MidiUnavailableException e1) {
e1.printStackTrace();
return;
}
// this is a standard pattern for associating method calls with GUI events
// the call to the constructor of KeyAdapter creates an object of an
// anonymous subclass of KeyAdapter, whose keyPressed method is called
// when a key is pressed in the GUI
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
char key = (char) e.getKeyCode();
set.add(key);
//for mset.iterator();
switch (key) {
case '1':
midi.beginNote(new Pitch(0).toMidiFrequency());
//midi.play(1, 1000, Midi.DEFAULT_INSTRUMENT);
setBackground(Color.red);
return;
case '2':
midi.beginNote(new Pitch(1).toMidiFrequency());
setBackground(Color.green);
return;
case '3':
midi.beginNote(new Pitch(2).toMidiFrequency());
setBackground(Color.blue);
return;
case '4':
midi.beginNote(new Pitch(3).toMidiFrequency());
setBackground(Color.MAGENTA);
return;
case '5':
midi.beginNote(new Pitch(4).toMidiFrequency());
setBackground(Color.yellow);
return;
case '6':
midi.beginNote(new Pitch(5).toMidiFrequency());
setBackground(Color.cyan);
return;
case '7':
midi.beginNote(new Pitch(6).toMidiFrequency());
setBackground(Color.ORANGE);
return;
case '8':
midi.beginNote(new Pitch(7).toMidiFrequency());
setBackground(Color.GRAY);
return;
case '9':
midi.beginNote(new Pitch(8).toMidiFrequency());
setBackground(Color.pink);
return;
case '0':
midi.beginNote(new Pitch(9).toMidiFrequency());
setBackground(Color.red);
return;
case '-':
midi.beginNote(new Pitch(10).toMidiFrequency());
setBackground(Color.blue);
return;
case '=':
midi.beginNote(new Pitch(11).toMidiFrequency());
setBackground(Color.white);
return;
case 'I':
System.out.println("GEdrtrfhftgh");
midi.changeInstrument();
}
}
});
addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent e) {
char key = (char) e.getKeyCode();
switch (key) {
case '1':
midi.endNote(1000);
midi.endNote(new Pitch(0).toMidiFrequency());
return;
case '2':
midi.endNote(new Pitch(1).toMidiFrequency());
return;
case '3':
midi.endNote(new Pitch(2).toMidiFrequency());
return;
case '4':
midi.endNote(new Pitch(3).toMidiFrequency());
return;
case '5':
midi.endNote(new Pitch(4).toMidiFrequency());
return;
case '6':
midi.endNote(new Pitch(5).toMidiFrequency());
return;
case '7':
midi.endNote(new Pitch(6).toMidiFrequency());
return;
case '8':
midi.endNote(new Pitch(7).toMidiFrequency());
return;
case '9':
midi.endNote(new Pitch(8).toMidiFrequency());
return;
case '0':
midi.endNote(new Pitch(9).toMidiFrequency());
return;
case '-':
midi.endNote(new Pitch(10).toMidiFrequency());
return;
case '=':
midi.endNote(new Pitch(11).toMidiFrequency());
return;
case 'i':
setBackground(Color.BLACK);
Midi.DEFAULT_INSTRUMENT=Instrument.ACCORDION.next();
return;
}
}
});
}
}