public static void main(String[] args) {
        Map<String, ArrayList<Data>> map = new HashMap<String, ArrayList<Data>>();        
    }

    public class Data {
        public String A;
        public String B;
        public String C;
        
        public Data() {
            
        }
        public String getKey() {
            return A + " " + B;
        }
        @Override
        public boolean equals(Object o) {
            if (!(o instanceof Data)) {
                return false;
            }
            Data com = (Data)o;
            return (com.getKey().equals(this.getKey()) && (com.C.equals(this.C)));            
        }
    }