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What is the SortedMap.subMap() method in Java?

Sumit Sharma

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

In this shot, we will discuss how to use the SortedMap.subMap() method in Java. This method is present in the SortedMap interface inside the java.util package.

The SortedMap.subMap() method is used to obtain the part of the map for a given range of keys of SortedMap.

Parameters

The SortedMap.subMap() method takes two parameters:

  • Key1: Minimum limit of key (included in result) to return the part of map.
  • Key2: Maximum limit of key (excluded in result) to return the part of map.

Return value

The SortedMap.subMap() method returns:

  • Map: Part of map for the range of keys in the SortedMap.

Code

Let’s look at the below code snippet.

import java.util.*;
class Main
{
public static void main(String[] args)
{
SortedMap<Integer, String> s = new TreeMap<Integer,String>();
s.put(2,"Welcome");
s.put(12,"to");
s.put(31,"the");
s.put(18,"world");
s.put(25,"of");
s.put(36,"java");
System.out.println("SortedMap mappings are: "+ s);
System.out.println("Map from the min_limit_key=18 to max_limit_key=36: " + s.subMap(18,36));
}
}
Using SortedMap.subMap() method in Java

Explanation

  • In line 1, we imported the required package.
  • In line 2, we made a Main class.
  • In line 4, we made a main function.
  • In line 6, we declared a SortedMap consisting of Integer type keys and String type values.
  • From lines 8 to 13, we inserted values in the Hashtable by using the TreeMap.put() method.
  • In line 15, we displayed the mappings of the present in the SortedMap.
  • In line 17, we used the SortedMap.subMap() method to obtain the subMap for a range of keys and displayed it.

In this way, we can use SortedMap.subMap() method in Java.

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communitycreator
java

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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