Java TreeMap get() Method Last Updated : 16 May, 2025 Comments Improve Suggest changes Like Article Like Report The get() method of the TreeMap class in Java is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. If the key does not exist in the map, the method returns null.Syntax of TreeMap get() MethodtreeMap.get(Object key)Parameter: key: The method takes one parameter "key" of object type, and refers to the key whose associated value is supposed to be fetched. Returns: The method returns the value associated with the "key" in the parameter, or null if no mapping exists for the key.Examples of Java TreeMap get() MethodExample 1: In this example, we are going to create a TreeMap with integer keys and string values, and then we will fetch the values for specific keys using the get() method. Java // Java program to demonstrate // the get() method of TreeMap import java.util.*; public class Geeks { public static void main(String[] args) { // Create an empty TreeMap TreeMap<Integer, String> tm = new TreeMap<Integer, String>(); // Map string values to int keys tm.put(10, "Geeks"); tm.put(15, "4"); tm.put(20, "Geeks"); tm.put(25, "Welcomes"); tm.put(30, "You"); System.out.println("Initial mapping: " + tm); // Get the value of key 25 System.out.println("The Value is: " + tm.get(25)); // Get the value of key 10 System.out.println("The Value is: " + tm.get(10)); } } OutputInitial mapping: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} The Value is: Welcomes The Value is: Geeks Example 2: In this example, we are going to create a TreeMap with string keys and integer values. Java // Java program to demonstrate // the get() method of TreeMap import java.util.*; public class Geeks { public static void main(String[] args) { // Create an empty TreeMap TreeMap<String, Integer> tm = new TreeMap<String, Integer>(); // Map int values to string keys tm.put("Geeks", 10); tm.put("4", 15); tm.put("Geeks", 20); tm.put("Welcomes", 25); tm.put("You", 30); System.out.println("Initial Mapping: " + tm); System.out.println("The Value is: " + tm.get("Geeks")); System.out.println("The Value is: " + tm.get("You")); } } OutputInitial Mapping: {4=15, Geeks=20, Welcomes=25, You=30} The Value is: 20 The Value is: 30 Important Points:If the key does not exist, get() method returns null.The duplicate keys will be overridden means only the latest value is retained.The treeMap stores keys in natural sorted order i.e. ascending for numbers, alphabetical for strings.The get() method can be used with any object types as long as the keys implement Comparable. Comment More infoAdvertise with us Next Article TreeMap headMap() Method in Java C chinmoy lenka Follow Improve Article Tags : Java Java-Collections Java - util package java-TreeMap Practice Tags : JavaJava-Collections Similar Reads TreeMap in Java TreeMap is a part of the Java Collection Framework. It implements the Map and NavigableMap interface and extends the AbstractMap class. It stores key-value pairs in a sorted order based on the natural ordering of keys or a custom Comparator. It uses a Red-Black Tree for efficient operations (add, re 11 min read Java TreeMap clear() Method The clear() method is a built-in method of the TreeMap class in Java of the java.util package. This method is used to remove all key-value mappings from the TreeMap. And after invoking this method, the map becomes completely empty.This method is very useful when we want to reset the map or discard a 2 min read TreeMap clone() Method in Java with Examples In Java, clone() method of the TreeMap class is used to return a shallow copy of the mentioned treemap. It just creates a copy of the map. --> java.util Package --> TreeMap Class --> clone() Method Syntax: Tree_Map.clone() Parameters: The method does not take any parameters. Return Type: A 2 min read Java TreeMap containsKey() Method The containsKey() method in Java is used to check if a given key exists in a TreeMap. If the key is present in the map, it returns true, otherwise, it returns false. This method is very helpful when we need to verify whether a mapping exists before performing any operation on it.Syntax of TreeMap co 3 min read TreeMap containsValue() Method in Java With Examples In Java, containsValue() method of the TreeMap class is used to check whether a particular value is being mapped by any key in the TreeMap. It takes the value as a parameter and returns True if that value is mapped by any of the keys in the map. --> java.util Package --> TreeMap class --> c 3 min read TreeMap entrySet() Method in Java The java.util.TreeMap.entrySet() method in Java is used to create a set out of the same elements contained in the treemap. It basically returns a set view of the treemap or we can create a new set and store the map elements into them. Syntax: tree_map.entrySet() Parameters: The method does not take 2 min read TreeMap firstEntry() and firstKey() Method in Java with Examples There are two variants of first() in Java.util.TreeMap, both are discussed in this article. Method 1: firstEntry() It returns a key-value mapping associated with the least key in this map, or null if the map is empty. Syntax: public Map.Entry firstEntry() Return Type: An entry with the least key and 3 min read Java TreeMap get() Method The get() method of the TreeMap class in Java is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. If the key does not exist in the map, the method returns null.Syntax of TreeMap get() MethodtreeMap.get(Object key)Parameter: key: The method takes one paramete 2 min read TreeMap headMap() Method in Java The java.util.TreeMap.headMap(key_point) method of TreeMap class is used to get all the pairs or portion of the map strictly less than the parameter key_value. The mentioned parameter is excluded from the newly prepared treemap. Since the set is backed by the map, so any changes to the map are refle 3 min read TreeMap keySet() Method in Java with Examples In Java, keySet() method of TreeMap class is present inside java.util package in Java is used to create a set out of the key elements contained in the treemap. It basically returns a set view of the keys or we can create a new set and store the key elements in them in ascending order. Since the set 3 min read Like