Treeset in Java

The following Java program illustrates several of the methods supported by this TreeSet collection Framework
import java.util.*;
class TestClass
{
public static void main (String[] args) throws java.lang.Exception
{
//create a TreeSet Object
TreeSet days=new TreeSet();
// add elements to the TreeSet
days.add("Sunday");
days.add("Monday");
days.add("Tuesday");
days.add("Wednesday");
days.add("Thursday");
days.add("Friday");
days.add("Saturday");
//Iterate through TreeSet
Iterator itr=days.iterator();
while(itr.hasNext()){
System.out.println(itr.next());
}
//remove a single entry from TreeSet
days.remove("Monday");
System.out.println(days);
//search in TreeSet
if(days.contains("Saturday"))
System.out.println("Item Found");
else
System.out.println("Item Not Found");
//Remove all items from TreeSet
days.clear();
//Size of the TreeSet
System.out.println("Size of the HashSet: "+days.size());
}
}
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