Music Player

[Spandan Pandey]

I ran this program,it compiled but nothing happened.

Would love your help!!Thanks!!

import javax.sound.midi.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
  
   public class MiniMusicPlayer3 {
   
 static JFrame f = new JFrame("My First Music Video");
 static MyDrawPanel m1;
 
 public static void main(String[ ] args) {
  MiniMusicPlayer3 mini = new MiniMusicPlayer3( );
  mini.go( );
}

  public void setUpGUI( ) {
  m1 = new MyDrawPanel( );
  f.setContentPane(m1);
  f.setBounds(30,30,300,300);
  f.setVisible(true);
 }
public void go ( ) {
 
 try {
      Sequencer sequencer = MidiSystem.getSequencer( );
        sequencer.open( );
     sequencer.addControllerEventListener(m1, new int[ ] {127} );
    Sequence seq = new Sequence(Sequence.PPQ, 4);
 Track track = seq.createTrack( );
 int r = 0;
 for(int i= 0;i<60;i+=4)
{
   r = (int) ((Math.random( ) * 50 ) + 1);
   track.add(makeEvent(144,1,r,100,i));
   track.add(makeEvent(176,1,127,0,i));
   track.add(makeEvent(128,1,r,100,i+2));
 }
 sequencer.setSequence(seq);
 sequencer.start( );
 sequencer.setTempoInBPM(120);
}catch (Exception ex) {ex.printStackTrace( ) ; }
}
  public MidiEvent makeEvent( int comd, int chan,int one,int two,int tick)
{
   MidiEvent event = null;
    
try {
    ShortMessage a = new ShortMessage ( );
  a.setMessage(comd,chan,one,two);
event = new MidiEvent(a,tick);
}catch(Exception e) {  }
 return event;
}

  class MyDrawPanel extends JPanel implements ControllerEventListener {
    boolean msg = false;
    public void controlChange(ShortMessage event) 
{ 
   msg = true;
 repaint ( );
}
  public void paintComponent(Graphics g) {
 if(msg) {
   Graphics2D g2 = (Graphics2D) g;
  int r =(int) (Math.random( ) * 250);
  int gr=(int) (Math.random( ) * 250);
  int b = (int) (Math.random( ) * 250);
  
g.setColor(new Color(r,gr,b));
 int ht= (int) ((Math.random( ) * 120)+10);
 int width=(int) ((Math.random ( ) * 120)+10);
  int x =(int) ((Math.random( ) * 40) + 10);
  int y =(int) ((Math.random( ) * 40)+ 10);
g.fillRect(x,y,ht,width);
msg = false;
 }
}
}
}

[Ulf Dittmer]

As to the GUI code, none of that is ever called, so it's to be expected that nothing is shown.

As to the Mid code, empty exception handlers like "}catch(Exception e) { }" are generally a bad idea.