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

Last update on March 12 2025 13:32:10 (UTC/GMT +8 hours)

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

Sample Solution:-

Java Code:

import java.util.*;
import java.util.Map.Entry;  
public class Example24 {  
           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 20: " + tree_map.tailMap(20, false));
 }
}

Sample Output:

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

For more Practice: Solve these Related Problems:

• Write a Java program to use tailMap(key, false) on a TreeMap to obtain all entries with keys strictly greater than a specified key.
• Write a Java program to iterate over the sub-map obtained by tailMap(key, false) and print each key-value pair.
• Write a Java program to collect entries with keys > a given value using Java streams and then print the sorted result.
• Write a Java program to calculate the average of values in the sub-map produced by tailMap(key, false) using streams.

Java Code Editor:

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