Set contains() method in Java with Examples
Last Updated :
31 Dec, 2018
Improve
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.
Syntax:
Java
boolean contains(Object element)Parameters: The parameter element is of the type of Set. This is the element that needs to be tested if it is present in the set or not. Return Value: 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"));
}
}
Output:
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#contains(java.lang.Object)
Set: [4, Geeks, Welcome, To] Does the Set contains 'Geeks'? true Does the Set contains '4'? true Does the Set contains 'No'? false
