// Java program to demonstrates  // the working of NavigableSet  import java.util.*; public class Geeks {  public static void main(String[] args) {  NavigableSet<Integer> ns = new TreeSet<>();  // Add elements to the set  ns.add(10);  ns.add(20);  ns.add(30);  ns.add(40);  ns.add(50);  System.out.println('Navigable Set: ' + ns);  } } 

// Java Program to demostrates the  // working of various methods of NavigableSet import java.util.NavigableSet; import java.util.TreeSet; public class Geeks {  public static void main(String[] args)  {  NavigableSet<Integer> ns = new TreeSet<>();  ns.add(0);  ns.add(1);  ns.add(2);  ns.add(3);  ns.add(4);  ns.add(5);  ns.add(6);  // Get a reverse view of the navigable set  NavigableSet<Integer> revNs = ns.descendingSet();  // Print the normal and reverse views  System.out.println('Normal order: ' + ns);  System.out.println('Reverse order: ' + revNs);  NavigableSet<Integer> t = ns.tailSet(3 true);  System.out.println('3 or more: ' + t);  System.out.println('lower(3): ' + ns.lower(3));  System.out.println('floor(3): ' + ns.floor(3));  System.out.println('higher(3): ' + ns.higher(3));  System.out.println('ceiling(3): ' + ns.ceiling(3));  System.out.println('pollFirst(): ' + ns.pollFirst());  System.out.println('Navigable Set: ' + ns);  System.out.println('pollLast(): ' + ns.pollLast());  System.out.println('Navigable Set: ' + ns);  System.out.println('pollFirst(): ' + ns.pollFirst());  System.out.println('Navigable Set: ' + ns);  System.out.println('pollFirst(): ' + ns.pollFirst());  System.out.println('Navigable Set: ' + ns);  System.out.println('pollFirst(): ' + ns.pollFirst());  System.out.println('Navigable Set: ' + ns);  System.out.println('pollFirst(): ' + ns.pollFirst());  System.out.println('pollLast(): ' + ns.pollLast());  } } 

// Java Program to demonstrates the working of add() import java.util.*; import java.io.*; class Geeks {  public static void main(String[] args)  {  NavigableSet<String> ts = new TreeSet<String>();  // Elements are added using add() method  ts.add('A');  ts.add('B');  ts.add('C');  ts.add('A');  System.out.println('NavigableSet: ' + ts);  } } 

// Java program to demonstrates the  // working of contains() first() and last() method import java.util.*; import java.io.*; class Geeks {  public static void main(String[] args)  {  NavigableSet<String> ts = new TreeSet<String>();  // Elements are added using add() method  ts.add('A');  ts.add('B');  ts.add('C');  ts.add('A');  System.out.println('NavigableSet: ' + ts);  String s = 'D';  // Check if the above string exists in  // the NavigableSet or not  System.out.println('D exists in the NavigableSet?: '  + ts.contains(s));  // Print the first element in  // the NavigableSet  System.out.println('First Element of NavigableSet: '   + ts.first());  // Print the last element in  // the NavigableSet  System.out.println('Last Element of NavigableSet: '   + ts.last());  } } 

// Java Program to demonstrates the working of remove() // pollFirst() and pollLast() method import java.io.*; import java.util.*; class Geeks {  public static void main(String[] args)  {  NavigableSet<String> ts = new TreeSet<String>();  // Elements are added using add() method  ts.add('A');  ts.add('B');  ts.add('C');  ts.add('B');  ts.add('D');  ts.add('E');  System.out.println('NavigableSet: ' + ts);  // Removing the element b  ts.remove('B');  System.out.println('After removing element ' + ts);  // Remove the First element of TreeSet  ts.pollFirst();  System.out.println(  'After the removal of First Element ' + ts);  // Remove the Last element of TreeSet  ts.pollLast();  System.out.println(  'After the removal of Last Element ' + ts);  } } 

// Java Program to iterate through NavigableSet import java.util.*; import java.io.*; class Geeks {  public static void main(String[] args)  {  NavigableSet<String> ts = new TreeSet<String>();  // Elements are added using add() method  ts.add('C');  ts.add('D');  ts.add('E');  ts.add('A');  ts.add('B');  ts.add('Z');  // Iterating though the NavigableSet  for (String i : ts)  System.out.print(i + ' ');  } }