It is part of the java.util package and implements the Map interface. Tip: Unlike HashMap, which does not maintain order, TreeMap keeps its keys sorted.

package com.java.w3schools.blog.treemap; · import java.util.Collections; import java.util.Map; import java.util.TreeMap; · public class TreeMapExamples { · public static void main(String[] args) { · // sorting in ascending order · Map<Integer, String> treeMap = new TreeMap<>(); ·

September 3, 2014 - import java.util.*; public class TreeMapExample{ public static void main(String args[]) { TreeMap&lt;Integer,String&gt; map=new TreeMap&lt;Integer,String&gt;(); map.put(200,"A"); map.put(202,"B"); map.put(201,"C"); map.put(203,"D"); System.out.println("Before invoking the remove() method"); for(Map.Entry m:map.entrySet()) { System.out.println(m.getKey()+" "+m.getValue()); } map.remove(202); System.out.println("After invoking the remove() method"); for(Map.Entry m:map.entrySet()) { System.out.println(m.getKey()+" "+m.getValue()); } } }

Java Vs. C++ ... The TreeMap class implements the Map interface by using a tree.

May 23, 2025 - In Java, TreeMap is an implementation of the SortedMap interface provided by the Java Collections Framework.

In this example we are storing the key and value mappings into the TreeMap and we are getting a sorted key-value mapping upon fetching the data from TreeMap. import java.util.TreeMap; import java.util.Set; import java.util.Iterator; import java.util.Map; public class Details { public static void main(String args[]) { /* This is how to declare TreeMap */ TreeMap<Integer, String> tmap = new TreeMap<Integer, String>(); /*Adding elements to TreeMap*/ tmap.put(1, "Data1"); tmap.put(23, "Data2"); tmap.put(70, "Data3"); tmap.put(4, "Data4"); tmap.put(2, "Data5"); /* Display content using Iterator*/ Set set = tmap.entrySet(); Iterator iterator = set.iterator(); while(iterator.hasNext()) { Map.Entry mentry = (Map.Entry)iterator.next(); System.out.print("key is: "+ mentry.getKey() + " & Value is: "); System.out.println(mentry.getValue()); } } }

The Map interface is a part of the Java Collections Framework and is used to store key-value pairs.

Thank you for being patient. We are doing some work on the site and will be back shortly

In the next chapter, you will learn about TreeMap, which stores key/value pairs in sorted order by key. From Java 10, you can use the var keyword to declare a HashMap variable without writing the type twice.

The W3Schools online code editor allows you to edit code and view the result in your browser

The TreeMap class of the Java collections framework provides the tree data structure implementation. It implements the NavigableMap interface.

Learn Java, Programming, Spring, Hibernate throw tutorials, examples, and interview questions · TreeMap in Java is a SortedMap and it maintains Sorting order when you insert an object on it.

July 8, 2026 - public class TreeMap<K,V> extends AbstractMap<K,V> implements NavigableMap<K,V>, Cloneable, java.io.Serializable

May 23, 2023 - Since the TreeMap class comes from the java.util package, it must be imported in order to be used. The TreeMap is initialized with two generic types inside angle brackets < ...

April 1, 2025 - A TreeMap data structure is a collection that stores key-value pairs in a naturally sorted order. A TreeMap is a part of the Java Collections Framework and is a map implementation.

December 5, 2023 - The Time complexity for Insertion, Deletion, and Search is O(log N), where N is the number of elements in the TreeMap. The space complexity is O(N) for storing N elements. Let's illustrate these complexities with a practical example: import java.util.*; public class TreeMapComplexityExample { public static void main(String[] args) { TreeMap<String, Double> productPrices = new TreeMap<>(); productPrices.put("Laptop", 1200.00); productPrices.put("Smartphone", 800.00); productPrices.put("Tablet", 500.00); productPrices.put("Headphones", 100.00); productPrices.remove("Tablet"); System.out.println("Product Price for 'Smartphone': $" + productPrices.get("Smartphone")); } }

December 14, 2022 - TreeMap in Java is a part of the Java Collection framework where it implements the Map interface and NavigableMap as well.

April 9, 2025 - Java Fundamentals Interview ... Questions ... The TreeMap class in Java is part of the Java Collection Framework and implements the Map and SortedMap interfaces....