java how to make set

1//Creating HashSet 
2HashSet<String> set = new HashSet(); 
3
4//adding elements  
5set.add("One");    
6set.add("Two");    
7
8//Removing element);
9set.remove("One"); 
10
11//Removing all the elements available in the set  
12set.clear();  

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} 

1import java.util.Arrays;
2import java.util.HashSet;
3import java.util.Set;
4/*
5check a set size by set.size()
6*/
7
8public class MainClass {
9  public static void main(String[] a) {
10    String elements[] = { "A", "B", "C", "D", "E" };
11    Set set = new HashSet(Arrays.asList(elements));
12
13    System.out.println(set.size());
14  }
15}
16