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//package myPackage;

import java.util.Scanner;

import java.util.Set;

import java.util.TreeSet;

public class TreeSetTest

{

//main method

public static void main (String[] args)

{

//Syntax: Set<Datatype> nameofSet = new TreeSet<datatype>()

Set<Integer> t = new TreeSet<Integer>();

//To append to a Set

t.add(5);

t.add(8);

t.add(5);

t.add(9);

System.out.println(t);//print 5, 8, 9

t.add(-8);

t.remove(8);

//clear an entire Set

//t.clear();

//check if empty

//t.isEmpty()

//get the length of the Set

//t.size();

//Check if element exists within the Set

boolean m = t.contains(5);

System.out.println(m);

System.out.println(t);

}

}