package hf;
import javax.sound.midi.*;
public class BeatBox1
{
public static void main(String[] args)
{
BeatBox1 boom = new BeatBox1();
boom.go();
}
public void go()
{
try
{
Sequencer player = MidiSystem.getSequencer();
player.open();
Sequence seq = new Sequence(Sequence.PPQ,4);
Track track = seq.createTrack();
for(int i = 5;i<125;i+=5)
{
track.add(makeEvent(144,i,i));
track.add(makeEvent(128,i,i+2));
}
player.setSequence(seq);
player.start();
}
catch(Exception e)
{
System.out.println("Problem starting the BeatBox");
}
}
public static MidiEvent makeEvent(int onOff,int note,int time)
{
MidiEvent event = null;
try
{
ShortMessage a = new ShortMessage();
a.setMessage(onOff,1,note,100);
event = new MidiEvent(a,time);
return event;
}
catch(Exception e)
{
System.out.println("Error in creating Event.");
}
return event;
}
}
我在书中找到了上面的示例代码。他们建议makeEvent方法是静态的。是什么原因?make方法makeEvent()是否有任何优点是静态的?
当makeEvent()变为非静态时,程序也能正常运行。有没有任何性能增益或任何可以通过使方法静态获得的优势?