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Get Size of Java TreeSet Example

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  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. */