Java Utililty Methods Collection Subset

List of utility methods to do Collection Subset

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Description

The list of methods to do Collection Subset are organized into topic(s).

Method

booleanisSubset(Collection subset, Collection of)
is Subset 
for (Object obj : subset) {
    if (!of.contains(obj)) {
        return false;
return true;
booleanisSubset(Collection subSet, Collection superSet)
Verify if a set is subset of other set 
int occurrenceCount = 0;
if (subSet != null && superSet != null) {
    for (E subSetElement : subSet) {
        if (superSet.contains(subSetElement)) {
            occurrenceCount++;
    if (occurrenceCount == subSet.size()) {
...
booleanisSubset(Collection s1, Collection s2)
is Subset 
for (T t : s2) {
    if (!s1.contains(t))
        return false;
return true;
booleanisSubset(Collection subset, Collection superset)
is Subset 
if ((superset == null) || (superset.size() == 0)) {
    return ((subset == null) || (subset.size() == 0));
HashSet<T> hash = new HashSet<T>(superset);
for (T t : subset) {
    if (!hash.contains(t)) {
        return false;
return true;
booleanisSubset(final Collection l1, final Collection l2)
Checks whether the first collection provided is a subset of the second collection provided. 
return l2.containsAll(l1);
Listsub(Collection list, int start, int end)
sub 
if (list == null || list.isEmpty()) {
    return null;
return sub(new ArrayList<T>(list), start, end);