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The **`NavigableSet.higher()`** method is used to obtain the lowest element strictly greater than a given element in a set.
It returns `null` if there is no such element in the set.

>The `NavigableSet.higher()` method is present in the `NavigableSet` interface inside the `java.util` package.

Let’s understand with the help of an example. 

Suppose that a `NavigableSet` contains [1, 5, 3, 9, 10, 11, 16, 19]. Let $11$ be the element for which we need to determine the higher element. So, the result of `NavigableSet.higher()` is $16$.         
                
> When we add the elements in the `NavigableSet`, they get stored in a sorted form. If the `NavigableSet` is of `String` type, the elements get stored in alphabetical order irrespective of string length. 

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## Parameters
The `NavigableSet.higher()` method accepts one parameter, i.e., the element of the type of the elements maintained by this `Set` container.

## Return value
The `NavigableSet.higher()` method returns the lowest element greater than the specified element from the set.

## Code
Let us have a look at the code.


import java.util.NavigableSet;
import java.util.TreeSet;

class Main 
{
  public static void main(String[] args)
  {
    NavigableSet<Integer> s = new TreeSet<Integer>();

    s.add(6);
    s.add(8);
    s.add(5);
    s.add(3);
    s.add(9);
    s.add(10);
    s.add(17);

    System.out.println("Lowest element greater than 10 is: " + s.higher(10));
  }
}

## Explanation

* In lines 1 and 2, we imported the required packages and classes.
* In line 4 we made a `Main` class.
* In line 6, we made a `main()` function.

* In line 8, we created a `TreeSet` of `Integer` type. The `NavigableSet` is inherited from `SortedSet` which is actually inherited from `TreeSet` only. As `SortedSet` and `NavigableSet` are interfaces, we cannot instantiate an object of them.
* From lines 10 to 16, we added the elements into the `NavigableSet` by using the `add()` method.
* From line 18, we used the `NavigableSet.higher()` method and displayed the result with a message.



In this way, we can use the `NavigableSet.higher()` method in Java.


What is the NavigableSet.higher() method in Java?

Obtains lowest element greater than a specified element in a set, returning null if none exists.