import javax.swing.JOptionPane;

public class BaseBallStatsDemo {

    public static void main( String[] args) {

        int confirmResponse;
        do {
            while (true) {
                String numHitsStr = JOptionPane.showInputDialog("Enter the number of hits:");
                if( numHitsStr == null || numHitsStr.isEmpty() ) {
                    break;
                }
                int numHits = Integer.parseInt( numHitsStr );

                String numAtBatsStr = JOptionPane.showInputDialog("Enter the number of at bats:");
                if( numAtBatsStr == null || numAtBatsStr.isEmpty() ) {
                    break;
                }
                int numAtBats = Integer.parseInt( numAtBatsStr );

                BaseBallStats stats = new BaseBallStats();
                double avg = stats.batAvg(numHits, numAtBats);

                JOptionPane.showMessageDialog( null, "Batting Average is " + avg);
            }

            confirmResponse = JOptionPane.showConfirmDialog( null, "Are you sure you want to exit?");
        } while (confirmResponse != JOptionPane.YES_OPTION);

    }

}