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set interface collections example included

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2020-01-29 20:34:43 -06:00
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study/COLLECTIONS.MD
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@@ -133,6 +133,19 @@ Deque<String> d = new ArrayDeque<String>();
### Set Interface
A Set is a unordered list of elements with one basic principle different - all items are unique, duplicate elements are not allowed.
While `null` values are allowed in Sets, the element distinction rule is passed on to `null` values too, and thus at most only one can be in a Set at any time.
Set is implemented by [HashSet](#hashset-class), [LinkedHashSet](#linkedhashset-class), and [TreeSet](#treeset-class).
```java
Set<Double> s;
s = new HashSet<Double>();
s = new LinkedHashSet<Double>();
s = new TreeSet<Double>();
```
### SortedSet Interface
## Classes