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SortedSet add() method in Java with Examples

Last Updated : 12 Jul, 2025

The

method of

in Java is used to add a specific element into a

collection. The function adds the element only if the specified element is not already present in the set else the function returns False if the element is already present in the Set.

boolean add(E element)

Where E is the type of element maintained
by this Set collection.

The parameter

is of the type of element maintained by this Set and it refers to the element to be added to the Set.

The function returns True if the element is not present in the set and is new, else it returns False if the element is already present in the set.

: This method of

is inherited from the

in Java. Below programs illustrate the use of Java.util.Set.add() method:

:

// Java code to illustrate add() method

import java.io.*;
import java.util.*;

public class TreeSetDemo {
    public static void main(String args[])
    {
        // Creating an empty Set
        SortedSet<String> s
            = new TreeSet<String>();

        // Use add() method
        // to add elements into the Set
        s.add("Welcome");
        s.add("To");
        s.add("Geeks");
        s.add("4");
        s.add("Geeks");
        s.add("Set");

        // Displaying the Set
        System.out.println("Set: " + s);
    }
}

Set: [4, Geeks, Set, To, Welcome]

:

// Java code to illustrate add() method

import java.io.*;
import java.util.*;

public class TreeSetDemo {
    public static void main(String args[])
    {
        // Creating an empty Set
        SortedSet<Integer> s
            = new TreeSet<Integer>();

        // Use add() method
        // to add elements into the Set
        s.add(10);
        s.add(20);
        s.add(30);
        s.add(40);
        s.add(50);
        s.add(60);

        // Displaying the Set
        System.out.println("Set: " + s);
    }
}

Set: [10, 20, 30, 40, 50, 60]

:

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