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TreeSet contains() Method in Java

  • Difficulty Level : Basic
  • Last Updated : 21 Jun, 2021
Geek Week

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

Tree_Set.contains(Object element)

Parameters: The parameter element is of the type of TreeSet. This is the element that needs to be checked if it is present in the TreeSet or not.
Return Value: The method returns true if the element is present in the set else it return False.
Below program illustrate the Java.util.TreeSet.contains() method:
 

Java




// Java code to illustrate contains() method
import java.io.*;
import java.util.TreeSet;
 
public class TreeSetDemo {
    public static void main(String args[])
    {
        // Creating an empty TreeSet
        TreeSet<String> tree = new TreeSet<String>();
 
        // Use add() method to add elements into the Set
        tree.add("Welcome");
        tree.add("To");
        tree.add("Geeks");
        tree.add("4");
        tree.add("Geeks");
        tree.add("TreeSet");
 
        // Displaying the TreeSet
        System.out.println("TreeSet: " + tree);
 
        // Check for "TreeSet" in the set
        System.out.println("Does the Set contains 'TreeSet'? " +
                                           tree.contains("TreeSet"));
 
        // Check for "4" in the set
        System.out.println("Does the Set contains '4'? " +
                                             tree.contains("4"));
 
        // Check if the list contains "No"
        System.out.println("Does the Set contains 'No'? " +
                                             tree.contains("No"));
    }
}
Output: 
TreeSet: [4, Geeks, To, TreeSet, Welcome]
Does the Set contains 'TreeSet'? true
Does the Set contains '4'? true
Does the Set contains 'No'? false

 

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