Size of TreeSet

Its very important to know the size of TreeSet as it is required in most of the times while coding

We have size() method in TreeSet class which helps us to determine the size of TreeSet

Size is the number of elements in that TreeSet

public int size()


Example :

  1. import java.util.*;
  2.  
  3. public class TreeSetSize {
  4.       public static void main(String[] args) {
  5.       TreeSet<Integer> ts = new TreeSet<Integer>();
  6.       ts.add(14);
  7.       ts.add(7);
  8.       ts.add(21);
  9.       ts.add(28);
  10.       ts.add(35);
  11.       ts.add(42);    
  12.       System.out.println("Initial Size of TreeSet: "+ts.size());
  13.       ts.remove(35);
  14.       ts.remove(42);
  15.       System.out.println("Size after removing 2 elements: "+ts.size());
  16.       System.out.println("Final TreeSet after removal of 2 elements: ");
  17.       for(int ele: ts){
  18.            System.out.println(ele);
  19.         }
  20.     }
  21. }
import java.util.*;

public class TreeSetSize {
      public static void main(String[] args) {
      TreeSet<Integer> ts = new TreeSet<Integer>();
      ts.add(14);
      ts.add(7);
      ts.add(21);
      ts.add(28);
      ts.add(35);
      ts.add(42);	 
      System.out.println("Initial Size of TreeSet: "+ts.size());
      ts.remove(35);
      ts.remove(42);
      System.out.println("Size after removing 2 elements: "+ts.size());
      System.out.println("Final TreeSet after removal of 2 elements: ");
      for(int ele: ts){
           System.out.println(ele);
        }
	}
}


Here Size just tells how many elements are present in the TreeSet

Don’t get confuse size with capacity in the TreeSet, we will talk about capacity separately

Just remember Size() returns number of elements present in TreeSet

Remember size() is a method , not a variable in the TreeSet class.

About the Author

Karibasappa G C (KB)
Founder of javainsimpleway.com
I love Java and open source technologies and very much passionate about software development.
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