Java Utililty Methods Set Create

List of utility methods to do Set Create

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Description

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

Method

HashSetasSet(K... values)
as Set 
return new HashSet<K>(Arrays.asList(values));
SetasSet(Object[] array)
as Set 
if (array == null) {
    return null;
Set result = new HashSet(array.length);
for (int i = 0; i < array.length; i++) {
    result.add(array[i]);
return result;
...
CollectionasSet(Optional opt)
as Set 
if (opt.isPresent()) {
    return Collections.singleton(opt.get());
return Collections.emptySet();
SetasSet(T... a)
as Set 
return a != null ? new HashSet(Arrays.asList(a)) : Collections.emptySet();
SetasSet(T... a)
as Set 
if (a.length > 1)
    return new HashSet<T>(Arrays.<T>asList(a));
else
    return Collections.singleton(a[0]);
SetasSet(T... args)
as Set 
return new HashSet<T>(Arrays.asList(args));
SetasSet(T... array)
as Set 
if (array == null) {
    return null;
Set<T> set = new HashSet<T>(array.length * 2);
for (T t : array) {
    set.add(t);
return set;
...
SetasSet(T... array)
Create a set from an array. 
Set<T> result = new HashSet<>();
Collections.addAll(result, array);
return result;
SetasSet(T... array)
This method works like Arrays#asList(Object[]) , but returns an instance of Set instead of a list 
final HashSet<T> set = new HashSet<T>();
Collections.addAll(set, array);
return set;
SetasSet(T... element)
as Set 
HashSet<T> elements = new HashSet<T>(element.length);
Collections.addAll(elements, element);
return elements;