Finding if given TreeSet is empty or not

 

import java.util.Iterator;

import java.util.TreeSet;

import java.util.Set;

public class TreeSetIsEmpty {

public static void check_ifEmpty(Set<String> set) {

if (!set.isEmpty()) {

System.out.println("The given set is not empty and have elements :");

System.out.println(set);

} else {

System.out.println("The given set is empty");

}

}

public static void main(String[] args) {

// creating our TreeSet

Set<String> ts = new TreeSet<>();

// adding element to our set

// insertion order is maintained here

ts.add("Neha");

ts.add("Nisha");

ts.add("Nishu");

ts.add("Rekha");

ts.add("Madhu");

ts.add("Disha");

ts.add("Tara");

ts.add("Tara"); // duplicate element can't be added

// creating another TreeSet

Set<String> ts1 = new TreeSet<>();

check_ifEmpty(ts);

check_ifEmpty(ts1);

}

}