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Set contains() method in Java with Examples

Last Updated : 31 Dec, 2018

The Java.util.Set.contains() method is used to check whether a specific element is present in the Set or not. So basically it is used to check if a Set contains any particular element.

boolean contains(Object element)

The parameter

is of the type of Set. This is the element that needs to be tested if it is present in the set or not.

The method returns true if the element is present in the set else return False. Below program illustrate the Java.util.Set.contains() method:

// Java code to illustrate Set.contains() method
import java.io.*;
import java.util.*;

public class HashSetDemo {
    public static void main(String args[])
    {
        // Creating an empty Set
        Set<String> set = new HashSet<String>();

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

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

        // Check for "Geeks" in the set
        System.out.println("Does the Set contains 'Geeks'? "
                           + set.contains("Geeks"));

        // Check for "4" in the set
        System.out.println("Does the Set contains '4'? "
                           + set.contains("4"));

        // Check if the Set contains "No"
        System.out.println("Does the Set contains 'No'? "
                           + set.contains("No"));
    }
}

Set: [4, Geeks, Welcome, To]
Does the Set contains 'Geeks'? true
Does the Set contains '4'? true
Does the Set contains 'No'? false

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