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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