elevatormusic.java

用java模拟的电梯程序,可以选择有几层楼,一共有几个人在哪几层等电梯,可以不断的增加等电梯的人数,并看电梯如何以设定的方式运行.

package com.Anance.elevator.view;

import java.io.*;
import java.net.*;
import javax.sound.midi.*;

public class ElevatorMusic implements MetaEventListener {
   private Sequencer sequencer;
   private boolean endOfMusic;
   private String fileName;
   private Sequence soundSequence;

   public ElevatorMusic( String file )
   {
      try {
         sequencer = MidiSystem.getSequencer();
         sequencer.addMetaEventListener( this );
         fileName = file;
      }
      catch ( MidiUnavailableException midiException ) {
         midiException.printStackTrace();
      }
   } 

   public boolean open()
   {
      try {
         URL url = getClass().getResource( fileName );
         soundSequence = MidiSystem.getSequence ( url );
         sequencer.open();
         sequencer.setSequence( soundSequence );
      }
      catch ( NullPointerException nullPointerException ) {
         nullPointerException.printStackTrace();
         return false;
      }
      catch ( InvalidMidiDataException midiException ) {
         midiException.printStackTrace();
         soundSequence = null;
         return false;
      }
      catch ( java.io.IOException ioException ) {
         ioException.printStackTrace();
         soundSequence = null;
         return false;
      }
      catch ( MidiUnavailableException midiException ) {
         midiException.printStackTrace();
         return false;
      }
      return true;
   }

   public void play()
   {
      sequencer.start();
      endOfMusic = false;
   }

   public Sequencer getSequencer()
   {
      return sequencer;
   }

   public void meta( MetaMessage message )
   {
      if ( message.getType() == 47 ) {
         endOfMusic = true;
         sequencer.stop();
      }
   }
}