java.util.TreeSet.size() Method

Description

The size() method is used to get the number of elements in this set (its cardinality).

Declaration

Following is the declaration for java.util.TreeSet.size() method.

public int size()

Parameters

• NA

Return Value

The method call returns the number of elements in this set.

Exception

• NA

Example

The following example shows the usage of java.util.TreeSet.size() method.

package com.tutorialspoint;

import java.util.TreeSet;

public class TreeSetDemo {
   public static void main(String[] args) {
      // creating a TreeSet 
      TreeSet <Integer>treeadd = new TreeSet<Integer>();
     
      // adding in the tree set
      treeadd.add(1);
      treeadd.add(13);
      treeadd.add(17);
      treeadd.add(2);
     
      // Size of the tree set
      System.out.println("Size of the tree set is: "+treeadd.size());      
   }     
}

Let us compile and run the above program, this will produce the following result.

Size of the tree set is: 4