Java TreeMap get() Method

Last Updated : 16 May, 2025

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() Method

treeMap.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() Method

Example 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));
    }
}

Output

Initial 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"));
    }
}

Output

Initial 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.

TreeMap headMap() Method in Java

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