/*
* Constructs a new DNAStrand from a given sequence (in the three to five ordering)
*/
public DNAStrand(String sequence) {
if (sequence.length() > 0) {
fiveEnd = threeEnd = new Nucleotide(sequence.charAt(0));
for (int i = 1; i < sequence.length(); i++) {
Nucleotide now = new Nucleotide(sequence.charAt(i));
fiveEnd.append(now);
fiveEnd = now;
}
} else {
throw new IllegalArgumentException();
}
}
