java.util.TreeSet.size() Method

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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