private HashMap<String, Integer> may;
    private ArrayList<String> april = new ArrayList<String>();

    public Test(ArrayList<String> april) {
        this.april = april;
        this.may = new HashMap<String, Integer>();
        doStuff();
        if (this.may.size() <= 5) System.out.println(this.may.keySet());
        else System.out.println(getOccurrence());
    }