Java Utililty Methods Set Difference

List of utility methods to do Set Difference

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Description

The list of methods to do Set Difference are organized into topic(s).

Method

SetcomputeDifference(Set a, Set b, String prefix, boolean exactMatch)
compute Difference 
Set<String> overlap = new HashSet<String>();
for (Iterator<String> it = a.iterator(); it.hasNext();) {
    String code = it.next();
    if (!exactMatch && code.startsWith(prefix))
        if (!b.contains(code))
            overlap.add(code);
    if (exactMatch)
        if (!b.contains(code))
...
SetdiffAbyB(Set setA, Set setB)
A = {1, 2, 3, 4, 5} and B = {3, 4, 5, 6, 7, 8}. 
if (isEmpty(setA) && !isEmpty(setB)) {
    return Collections.unmodifiableSet(setB);
if (!isEmpty(setA) && isEmpty(setB)) {
    return Collections.unmodifiableSet(setA);
if (isEmpty(setA) && isEmpty(setB)) {
    return Collections.unmodifiableSet(new LinkedHashSet<T>());
...
Setdifference(final Set set1, final Set set2)
difference 
Set<E> set = new HashSet<>(set1);
set.removeAll(set2);
return Collections.unmodifiableSet(set);
Setdifference(final Set first, final Set second)

Returns a set containing all the elements which are not contained by the two given sets. 

final Set<T> retval = new HashSet<T>();
for (final T e : first) {
    if (!second.contains(e)) {
        retval.add(e);
for (final T e : second) {
    if (!first.contains(e)) {
...
Setdifference(Set a, Set b)
difference 
Set temp = new HashSet();
temp.addAll(a);
temp.removeAll(b);
return temp;
Setdifference(Set first, Set second)
difference 
Set<T> copyOfFirst = new LinkedHashSet<>(first);
copyOfFirst.removeAll(second);
return copyOfFirst;
Setdifference(Set s1, Set s2)
Return is s1 \ s2 
Set<T> s3 = new HashSet<T>(s1);
s3.removeAll(s2);
return s3;
Setdifference(Set setA, Set setB)
This method finds the difference between set A and set B i.e. 
Set<T> difference = new HashSet<T>(setA);
difference.removeAll(setB);
return difference;