public class Hamming {

public String left = "";

public String right = "";

public Hamming(String leftStrand, String rightStrand) {

if (leftStrand.length() != rightStrand.length()){

throw new IllegalArgumentException("strands must be of equal length");

}

else {

this.left = leftStrand;

this.right = rightStrand;

}

}

public int getHammingDistance() {

int differenceCount = 0;

for (int i = 0; i < this.left.length(); i++){

if (this.left.charAt(i) != this.right.charAt(i)){

differenceCount++;

}

}

return differenceCount;

}

}