@Override
    public void doAction(String value) {
        switch (value) {
            case "DAS": this.displayAverageScore();   
                break;
            case "DAA": this.displayAverageScore();   
                break;
            case "DLL": this.displayAverageScore();   
                break;    
            default:
                System.out.println("Invalid action.");
        }
    }