How to find does TreeSet contains elements or not

Returns true if this set contains the specified element.More formally, returns true if and only if this set contains an element e such that (o==null ? e==null :
 o.equals(e)).


import java.util.Set;
import java.util.TreeSet;

public class ContailsElement {
   
    public static void main(String[] args) {
       
           Set<String> ts = new TreeSet<String>();
            ts.add("mumbai");
            ts.add("delhi");
            ts.add("kolkata");
            ts.add("chandigarh");
            ts.add("dehradun");

            // print treeset
            System.out.println(" ts ="+ts);
           
            System.out.println(ts.contains("java"));
            System.out.println(ts.contains("delhi"));
            System.out.println(ts.contains("php"));
       
        }

}

Output:

ts =[chandigarh, dehradun, delhi, kolkata, mumbai]

false

true

false

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