Java Utililty Methods List Sort

if (versions != null) {
    Collections.sort(versions);

class ComparatorThis implements Comparator<String> {
    public int compare(String o1, String o2) {
        String s1 = (String) o1;
        String s2 = (String) o2;
        if (s1 == null || s2 == null) {
            return 0;
        return s1.compareTo(s2);
...

List<T> result = new ArrayList<T>(a.size());
Iterator<T> aIter = a.iterator();
Iterator<T> bIter = b.iterator();
T aVal = null;
if (aIter.hasNext()) {
    aVal = aIter.next();
T bVal = null;
...

List<String> out = new ArrayList<>(in);
Collections.sort(out);
return Collections.unmodifiableList(out);

List<T> result = new ArrayList<>(collection);
Collections.sort(result);
return result;

List<T> list = new LinkedList<>(collection);
Collections.sort(list);
return list;

List<T> list = new ArrayList<T>();
list.addAll(collection);
Collections.sort(list);
return list;