What is the TreeMap.descendingMap() method in Java?
In this shot, we will learn how to use the TreeMap.descendingMap() method in Java.
Introduction
The TreeMap.descendingMap() method is present in the NavigableMap interface inside the java.util package. TreeMap implements the NavigableMap interface.
The TreeMap.descendingMap() method is used to obtain the reverse view of the elements present in the TreeMap.
Syntax
The syntax of the TreeMap.descendingMap() is shown below:
NavigableMap descendingMap();
Parameters
The TreeMap.descendingMap() method does not accept any parameters.
Return value
The TreeMap.descendingMap() method returns a reverse view of the elements present in the NavigableMap.
Code
Let’s have a look at the code.
import java.util.*;class Main{public static void main(String[] args){TreeMap<Integer,String> s = new TreeMap<Integer,String>();s.put(6,"Learn");s.put(8,"in-demand");s.put(5,"tech");s.put(3,"skills");s.put(9,"at");s.put(10,"Educative.io");NavigableMap y = s.descendingMap();System.out.println("The resultant map after using" +"TreeMap.descendingMap() is: " + y);}}
Explanation
-
In line 1, we import the required package.
-
In line 2, we make the
Mainclass. -
In line 4, we make a
main()function. -
In line 6, we create a
TreeMapthat contains keys of typeIntegerand values of typeString. -
From lines 8 to 13, we use the
TreeMap.put()method to add the elements into theTreeMap. -
In line 15, we use the
TreeMap.descendingMap()method and display the resultant map with a message in line 16.
So, this is the way to use the TreeMap.descendingMap() method in Java.
