Creating a Set
A set is a collection that holds unique values. Adding a value that's
already in the set has no effect.
// Create the set
Set set = new HashSet();
// Add elements to the set
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
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()]);
thanx 4 sharing..........
b = set.contains("c"); // true
b = set.contains("C"); // true
last posting is not correct.
b = set.contains("c"); // true
b = set.contains("C"); // False
Thanks a lot man keep doing you great work.
is there a way to add all the letters (a,b,c) in one go ??
thanks
thank you
hi u can add the elements to list in one go
String[] abc={"a","b","c","a"};
Set obj=new HashSet(Arrays.asList(abc));--- which converts arrays to set
String[] unique=(String[]) obj.toArray(new String[obj.size()]);
---> it will return unique values i,e unique contain ["a","b","c"]
tnx 4 giving this kind of answer....
thank you
I cant understood.Can you explain briefly?
b = set.contains("C"); // true
Thanks very much for this example :)