Java: Get a portion of a map whose keys are greater than or equal to a given key

Last update on May 23 2025 13:08:42 (UTC/GMT +8 hours)

23. Get TailMap from Inclusive Key

Write a Java program to get a portion of a map whose keys are greater than or equal to a given key.

Sample Solution:-

Java Code:

import java.util.*;
import java.util.Map.Entry;  
public class Example23 {  
           public static void main(String args[]) {

  // Declare tree maps
  TreeMap < Integer, String > tree_map = new TreeMap < Integer, String > ();

  // Put elements to the map 
  tree_map.put(10, "Red");
  tree_map.put(20, "Green");
  tree_map.put(30, "Black");
  tree_map.put(40, "White");
  tree_map.put(50, "Pink");
  System.out.println("Orginal TreeMap content: " + tree_map);
  System.out.println("Keys are greater than or equal to 20: " + tree_map.tailMap(20));
 }
}

Sample Output:

Orginal TreeMap content: {10=Red, 20=Green, 30=Black, 40=White, 50=Pink
}                                                                      
Keys are greater than or equal to 20: {20=Green, 30=Black, 40=White, 50
=Pink}

For more Practice: Solve these Related Problems:

Write a Java program to use tailMap() on a TreeMap to get all entries with keys greater than or equal to a specified key.
Write a Java program to iterate over a tailMap() and compute the total of its values.
Write a Java program to use Java streams to filter a TreeMap for keys ≥ a given value and print the resulting map.
Write a Java program to compare the tailMap() result with a manual filtering of the TreeMap’s entries based on a key threshold.

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Java Code Editor:

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