TreeSet : higher(E e) : get least Greater element for this element

E higher(E e)

Returns the least element in this set strictly greater than the given element or null if there is no such element.

import java.util.*;

class TreeSetHigher{
 public static void main(String args[]){
  TreeSet<Integer> mySet = new TreeSet<> ();
  
  /* Add Elements too mySet */
  for(int i=20; i>0; i-=2){
   mySet.add(i);
  }
  
  System.out.println("Elements in mySet are");
  System.out.println(mySet+"\n");
  
  for(int i=1; i<22; i+=2){
   System.out.print("Least Higher Element of " + i +" is ");
   System.out.println(mySet.higher(i));
  }
 }
}

Output

Elements in mySet are
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]

Least Higher Element of 1 is 2
Least Higher Element of 3 is 4
Least Higher Element of 5 is 6
Least Higher Element of 7 is 8
Least Higher Element of 9 is 10
Least Higher Element of 11 is 12
Least Higher Element of 13 is 14
Least Higher Element of 15 is 16
Least Higher Element of 17 is 18
Least Higher Element of 19 is 20
Least Higher Element of 21 is null

1. throws NullPointerException if the specified element is null and this set uses natural ordering, or its comparator does not permit null elements.

import java.util.*;

class TreeSetHigherNullPointer{
 public static void main(String args[]){
  TreeSet<Integer> mySet = new TreeSet<> ();
  
  /* Add Elements too mySet */
  for(int i=20; i>0; i-=2){
   mySet.add(i);
  }
  
  System.out.println("Elements in mySet are");
  System.out.println(mySet+"\n");
  
  System.out.println("Least higher Element for null is");
  mySet.higher(null);
 }
}

Output

Elements in mySet are
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]

Least higher Element for null is
Exception in thread "main" java.lang.NullPointerException
        at java.util.TreeMap.compare(TreeMap.java:1188)
        at java.util.TreeMap.getHigherEntry(TreeMap.java:456)
        at java.util.TreeMap.higherKey(TreeMap.java:769)
        at java.util.TreeSet.higher(TreeSet.java:447)
        at TreeSetHigherNullPointer.main(TreeSetHigherNullPointer.java:16)

2. throws ClassCastException if the specified element cannot be

compared with the elements currently in the set

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