import java.util.ArrayList;
 
/**
 * Notebook is a class that the user can enter notes into and can later list all the notes in the notebook.
 *
*/
 
public class NoteBook
{
    // instance variables 
    private ArrayList noteBook;
    private int numberOfNotes = 0;
    int urgentNotes;
   
    
 
    /**
     * Constructor for objects of class NoteBook
     */
    public NoteBook()
    {
        // initialise instance variables
        
        noteBook = new ArrayList ();
        
    }
    /**
     * Insert a note to the notebook.
     * @param newNote the note to add
     */
    public void insertNote(Note newNote) 
                    
    {
        noteBook.add(newNote);        
        
        
        
    }
 
     /**
     * Remove the note with number 'noteNumber' from the notebook.
     * If there is no note with such a number, just return.
     */
    public void removeNote(int noteNumber)
              throws Exception
    {                     
        if  (noteNumber < 0 || noteNumber > noteBook.size())        
         {
            throw new IllegalNumberException(noteNumber);
         }
       else 
            noteBook.remove(noteNumber);
           
    }   
 
    
     
    /**
     * Return the number of notes currently in the notebook.
     */
    public int numberOfNotes()
    {   
       
        for (int i = 0; i < noteBook.size(); i++)
        {
           numberOfNotes = noteBook.size() ;
        }
           
        return numberOfNotes;
    }
 
    /**
     * Return the number of notes in the notebook with the highest priority(priority#5).
     */
    public int urgentNotes()
    {   
        
        return urgentNotes;
    }
      
 
    /**
     * List all notes in the notebook with a number associate with each note.
     */
    
    public void listAll()   
    {  
        for(int i = 0; i < noteBook.size(); i++)
        {
 
            System.out.println(i + ". " + noteBook.get(i));
        }
    }    
         
   
}
i made a method to put priority numbers next to the note and the highest priority number is 5 so now i have to make a method return the number of priority numbers that are of high priority#5 this is similar to the numberofnotes but i need to specfically count the number of notes that equal priority#5 ..how exactly would i do that