set java

1import java.util.*;
2public class SetDemo {
3
4  public static void main(String args[]) { 
5      int count[] = {34, 22,10,60,30,22};
6      Set<Integer> set = new HashSet<Integer>();
7      try {
8         for(int i = 0; i < 5; i++) {
9            set.add(count[i]);
10         }
11         System.out.println(set);
12
13         TreeSet sortedSet = new TreeSet<Integer>(set);
14         System.out.println("The sorted list is:");
15         System.out.println(sortedSet);
16
17         System.out.println("The First element of the set is: "+ (Integer)sortedSet.first());
18         System.out.println("The last element of the set is: "+ (Integer)sortedSet.last());
19      }
20      catch(Exception e) {}
21   }
22} 
23
24OUTPUT:
25
26              [34, 22, 10, 60, 30]
27              The sorted list is:
28              [10, 22, 30, 34, 60]
29              The First element of the set is: 10
30              The last element of the set is: 60

1import java.util.*;
2public class SetDemo {
3
4  public static void main(String args[]) { 
5      int count[] = {34, 22,10,60,30,22};
6      Set<Integer> set = new HashSet<Integer>();
7      try {
8         for(int i = 0; i < 5; i++) {
9            set.add(count[i]);
10         }
11         System.out.println(set);
12
13         TreeSet sortedSet = new TreeSet<Integer>(set);
14         System.out.println("The sorted list is:");
15         System.out.println(sortedSet);
16
17         System.out.println("The First element of the set is: "+ (Integer)sortedSet.first());
18         System.out.println("The last element of the set is: "+ (Integer)sortedSet.last());
19      }
20      catch(Exception e) {}
21   }
22} 

1A Set is a Collection that cannot contain duplicate elements.
2  
3The Set interface contains only methods inherited from Collection 
4and adds the restriction that duplicate elements are prohibited.

1
2SET: Can only store unique values, 
3     And does not maintain order
4- HashSet can have null, order is not guaranteed
5- LinkedHashSet can have null and keeps the order 
6- TreeSet sorts the order and don't accept null 
7
8