String[][] readMultipleRows(int numOfRows) {
        int i=0;
        int j=0;
        String[][] returnDataRows = new String[numOfRows][3];
        try {
            if (store.getNumRecords() >0){ // it means the record store is not empty
                RecordEnumeration re = store.enumerateRecords(null, null, false);
                while (re.hasNextElement() && (i < numOfRows)){
                    returnDataRows[i][(j%3-1)] = new String(re.nextRecord());
                    if ((i % 3) == 1)
                        i++;
                    j++;
                }
                re.destroy();
            }
            return returnDataRows;
        }catch (Exception e){
            return returnDataRows;
        }
    }

.
.


//usage
for (int i=0;i<dataLast.length;i++){
   for (int j=0;j<dataLast[i].length;j++){
      append(dataLast[i][j]); //--------------------gives null
   }
}