Action Event and checking buttons

I am creating a simple program with multiple buttons. Is this way of checking which button was pressed is ok? Is it better to use switch..case.. statement?

public class KennelGUI extends JFrame implements ActionListener{
    private String filename; // holds the name of the file
    private Kennel kennel; // holds the kennel

    int buttonsNumber = 10;
    private JButton[] buttons = new JButton[buttonsNumber];

    private KennelGUI() {
        super("Kennel with GUI");

        do{
            filename = JOptionPane.showInputDialog("Please enter the filename of kennel information: ");
        }while(filename==null || filename.isEmpty()); //not good

        kennel = new Kennel();

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocation(300,100);
        setSize(200,500); 
        setVisible(true);
        setLayout(new FlowLayout());

        buttons[0] = new JButton("Add dog");
        buttons[1] = new JButton("Add cat");
        buttons[2] = new JButton("Add monkey");
        buttons[3] = new JButton("Set capacity");
        buttons[4] = new JButton("Print dogs with bones");
        buttons[5] = new JButton("Print all animals");
        buttons[6] = new JButton("Remove dog");
        buttons[7] = new JButton("Set kennel name");
        buttons[8] = new JButton("Search for pet");
        buttons[9] = new JButton("Quit");

        for(int i=0;i<buttonsNumber;i++)
        {
            add(buttons[i]);
            buttons[i].addActionListener(this);
            buttons[i].setPreferredSize(new Dimension(190, 30));
        }
    }

    /*
     * initialise() method runs from the main and reads from a file
     */
    private void initialise() {
        JOptionPane.showMessageDialog(null, "Using file " + filename);

        try(FileReader fr = new FileReader(filename);
            BufferedReader br = new BufferedReader(fr);
            Scanner infile = new Scanner(br)){
            Animal newAnimal = null;

            String kennelName = infile.nextLine();
            kennel.setName(kennelName);

            int kennelSize = infile.nextInt();
            infile.nextLine();
            kennel.setCapacity(kennelSize);

            int numPets = infile.nextInt();
            infile.nextLine();

            for(int i=0; i < numPets; i++){
                String type = infile.nextLine();
                switch(type)
                {
                    case "Dog":
                        newAnimal = new Dog();
                        break;
                    case "Cat":
                        newAnimal = new Cat();
                        break;
                    case "Monkey":
                        newAnimal = new Monkey();
                        break;
                    default:
                        throw new IOException("Type problem");//GUI?
                }
                newAnimal.load(infile);             
                kennel.addAnimal(newAnimal);
            }

        } catch (FileNotFoundException e) {
            JOptionPane.showMessageDialog(null,"The file: " + filename + " does not exist.\nAssuming first use and an empty file.\n" +
                               "If this is not the first use then have you \naccidentally deleted the file?","Warning",JOptionPane.WARNING_MESSAGE);
        } catch (IOException e) {
            JOptionPane.showMessageDialog(null,"An unexpected error occurred when trying to open the file " + filename,"Warning",JOptionPane.WARNING_MESSAGE);
        }
    }


        @Override
        public void actionPerformed(ActionEvent e) {

            switch(e.getSource()){
              case buttons[0]:
                admitDog();
                break;
              case buttons[1]:
                admitCat();
                break;
              case buttons[2]:
                admitDog();
                break;
              case buttons[3]:
                setKennelCapacity();
                break;
              case buttons[4]:
                printDogsWithBones();
                break;
              case buttons[5]:
                printAll();
                break;
              case buttons[6]:
                removePet();
                break;
              case buttons[7]:
                changeKennelName();
                break;
              case buttons[8]:
                searchForPet();
                break;
              case buttons[9]:  
                save();
                System.exit(0);
                break;
            }

        }
}