void getResultant(Object buf, int offset, int count) throws MPIException {
char[] tempArray = (char[]) buf;
System.arraycopy(arr, offset, tempArray, offset, count);
}
void createInitialBuffer(Object buf, int offset, int count) throws MPIException {
char[] tempArray = (char[]) buf;
arr = new char[tempArray.length];
System.arraycopy(buf, offset, arr, offset, count);
}