@Override
	public void stateChanged(ChangeEvent ce) 
	{
		System.out.println("you changed the state of the program...:P");
		if(((JTabbedPane)(ce.getSource())).getSelectedIndex()==0)
		{
			if((Student.studentListAudio.size()-Integer.parseInt(studentNumberComboBox.getSelectedItem().toString()))>=0)
				waitingButton.setText("Waiting : "+(Student.studentListAudio.size()-Integer.parseInt(studentNumberComboBox.getSelectedItem().toString())));
			else 
				waitingButton.setText("Waiting : 0");
				
		}
		else if(((JTabbedPane)(ce.getSource())).getSelectedIndex()==1)
		{
			if((Student.studentListText.size()-Integer.parseInt(studentNumberComboBox.getSelectedItem().toString()))>=0)
				waitingButton.setText("Waiting : "+(Student.studentListText.size()-Integer.parseInt(studentNumberComboBox.getSelectedItem().toString())));
			else 
				waitingButton.setText("Waiting : 0");
		}
	}