Java Utililty Methods Collection Equal

boolean allEqual(Class[] collection, Class cls)
Returns true if all classes in the collection array are equal to cls

for (Class<?> c : collection) {
 if (c != cls) {
 return false;
return true;

boolean allEqual(final Class[] collection, final Class cls)
all Equal

for (final Class<?> c : collection) {
 if (c != cls) {
 return false;
return true;

boolean areEqual(Collection collection1, Collection collection2)
are Equal

if (collection1.size() != collection2.size())
 return false;
Iterator iterator = collection1.iterator();
while (iterator.hasNext()) {
 if (!collection2.contains(iterator.next()))
 return false;
return true;
...

boolean areEqual(Collection collection1, Collection collection2)
are Equal

if (collection1 == null && collection2 == null)
 return true;
if (collection1 == null || collection2 == null)
 return false;
if (collection1.size() != collection2.size())
 return false;
for (Object member : collection1) {
 if (!collection2.contains(member))
...

boolean compareTwoCollectionsEquality(Collection expectedAffectedFiles, Collection affectedFiles)
compare Two Collections Equality

int counter = 0;
for (String f1 : affectedFiles) {
 for (String f2 : expectedAffectedFiles) {
 if (f1.equals(f2)) {
 counter++;
return expectedAffectedFiles.size() == counter;

boolean containsAtleastOneEqualString(Collection left, String right)
contains Atleast One Equal String

Collection<String> r = new ArrayList<String>(1);
r.add(right);
return containsAtleastOneEqualString(left, r);

int containsByEquals(Collection collection, Object obj)
contains By Equals

int result = 0;
for (Iterator iter = collection.iterator(); iter.hasNext();) {
 Object element = iter.next();
 if (element.equals(obj)) {
 result++;
return result;
...

boolean content_equality(Collection A, Collection B)
this can be an expensive operation, intended for testing not operating code

if (A == B)
 return true;
if (A == null || B == null)
 return false;
if (A.size() != B.size())
 return false;
Set<N> elements = new HashSet<N>();
elements.addAll(A);
...

boolean contentEquals(Collection l1, Collection l2)
content Equals

return l1.containsAll(l2) && l1.size() == l2.size();

boolean contentEquals(Collection list1, Collection list2)
content Equals

if (list1 == list2) {
 return true;
if (list1 == null || list2 == null) {
 return false;
if (list1.size() != list2.size()) {
 return false;
...