Get Size of Java TreeSet Example

1. /*
2.   Get Size of Java TreeSet Example
3.   This Java Example shows how to get the size or nubmer of elements stored in
4.   Java TreeSet object using size method.
5. */
6.  
7. import java.util.TreeSet;
8.  
9. public class GetSizeOfJavaTreeSetExample{
10.  
11.   public static void main(String[] args) {
12.    
13.     //create TreeSet object
14.     TreeSet tSet = new TreeSet();
15.    
16.     /*
17.       To get the size of TreeSet use
18.       int size() method of TreeSet class. It returns the number of elements
19.       stored in TreeSet object.    
20.     */
21.     System.out.println("Size of TreeSet : " + tSet.size());
22.    
23.     //add elements to TreeSet object
24.     tSet.add(new Integer("1"));
25.     tSet.add(new Integer("2"));
26.     tSet.add(new Integer("3"));
27.  
28.     System.out.println("Size of TreeSet after addition : " + tSet.size());
29.    
30.     //remove one element from TreeSet using remove method
31.     tSet.remove(new Integer("1"));
32.     System.out.println("Size of TreeSet after removal : " + tSet.size());
33.   }
34. }
35.  
36. /*
37. Output would be
38. Size of TreeSet : 0
39. Size of TreeSet after addition : 3
40. Size of TreeSet after removal : 2
41. */