Java Array, Finding Duplicates

Question

I have an array, and am looking for duplicates.

duplicates = false;
for(j = 0; j < zipcodeList.length; j++){
    for(k = 0; k < zipcodeList.length; k++         


        

Answer 1

Don't use == use .equals.

try this instead (IIRC, ZipCode needs to implement Comparable for this to work.

boolean unique;
Set s = new TreeSet();
for( ZipCode zc : zipcodelist )
    unique||=s.add(zc);
duplicates = !unique;