Creating a guava table using column names

guava_table1.java

Table<Integer, String, Object> table = HashBasedTable.create();
String[] columnNamesArray = (String[])columnNames.toArray(new String[columnNames.size()]);
List<List>[] rows = (List<List>[])data.toArray(new List[data.size()]);

for(int i = 0; i < rows.length; i++){
    Object[] objectArray = rows[i].toArray();
    for (int j = 0; j < objectArray.length; j++) {
        if(j==0){
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Date date = sdf.parse(objectArray[j].toString());
            table.put(i, columnNamesArray[j], date);

        } else {
            table.put(i, columnNamesArray[j] , objectArray[j]);
        }
    }
}