Create a TreepMap in Java and add elements

Let us create TreeMap in Java. It stores unique elements in ascending order −

TreeMap<Integer,String> m = new TreeMap<Integer,String>();

Now let us add some elements −

m.put(1,"PHP");
m.put(2,"jQuery");
m.put(3,"JavaScript");
m.put(4,"Ruby");
m.put(5,"Java");
m.put(6,"AngularJS");
m.put(7,"ExpressJS");

The following is an example to create a TreeMap −

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String args[]) {
      TreeMap<Integer,String> m = new TreeMap<Integer,String>();
      m.put(1,"PHP");
      m.put(2,"jQuery");
      m.put(3,"JavaScript");
      m.put(4,"Ruby");
      m.put(5,"Java");
      m.put(6,"AngularJS");
      m.put(7,"ExpressJS");
      for(Map.Entry e:m.entrySet()){
         System.out.println(e.getKey()+" "+e.getValue());
      }
   }
}

Output

1 PHP
2 jQuery
3 JavaScript
4 Ruby
5 Java
6 AngularJS
7 ExpressJS

Samual Sam

Updated on 30-Jul-2019 22:30:24

• Related Questions & Answers
• Add elements to a Vector in Java
• Create a TreeMap in Java and add key-value pairs
• Add elements to HashSet in Java
• Add elements to HashMap in Java
• Add elements at beginning and end of LinkedList in Java
• Java Program to create a HashMap and add key-value pairs
• Java Program to Add elements to a LinkedList
• Add elements to LinkedHashMap collection in Java
• How to add elements in Java CopyOnWriteArrayList?
• How to add elements in Java ArrayBlockingQueue?
• Add elements at the middle of a Vector in Java
• Add elements at the end of a Vector in Java
• Can we add null elements to a Set in Java?
• Add and Remove Elements in Perl Hashes
• Reduce a multi-dimensional array and add elements in Numpy