TreeSet contains() Method in Java

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.conatins() method:

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// 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"));
    }
}

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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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