Create the set
Set set = new HashSet();
set.add("a");
set.add("b");
set.add("c");
Remove elements from the set
set.remove("c");
Get number of elements in set
int size = set.size(); // 2
Adding an element that already exists in the set has no effect
set.add("a");
size = set.size(); // 2
Determining if an element is in the set
Iterating over the elements in the set
boolean b = set.contains("a"); // true
b = set.contains("c"); // false //
Iterating over the elements in the set
Iterator it = set.iterator();
while (it.hasNext()) {
// Get element
Object element = it.next();
}
Create an array containing the elements in the set (in this case a String array)
String[] array = (String[])set.toArray(new String[set.size()]);
See also Operations on 2 Sets in java
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