Java TreeMap get() Method
Last Updated :
16 May, 2025
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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 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 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.
