Java: Get NavigableSet view of the keys contained in a map

Last update on March 12 2025 13:34:01 (UTC/GMT +8 hours)

Write a Java program to get a NavigableSet view of keys in a map.

Sample Solution:-

Java Code:

import java.util.*;
import java.util.Map.Entry;  
public class Example18 {  
         public static void main(String args[]) {

  // Create a tree map
  TreeMap < Integer, String > tree_map1 = new TreeMap < Integer, String > ();

  // Put elements to the map 
  tree_map1.put(10, "Red");
  tree_map1.put(20, "Green");
  tree_map1.put(40, "Black");
  tree_map1.put(50, "White");
  tree_map1.put(60, "Pink");

  System.out.println("Orginal TreeMap content: " + tree_map1);
  System.out.println("Orginal TreeMap content: " + tree_map1.navigableKeySet());

 }
}

Sample Output:

Orginal TreeMap content: {10=Red, 20=Green, 40=Black, 50=White, 60=Pink
}                                                                      
Orginal TreeMap content: [10, 20, 40, 50, 60]

For more Practice: Solve these Related Problems:

• Write a Java program to retrieve a NavigableSet view of the keys in a TreeMap using navigableKeySet() and print the set.
• Write a Java program to convert a NavigableSet of keys into a descending set and print both the ascending and descending orders.
• Write a Java program to iterate over a NavigableSet of keys using a lambda expression and filter keys based on a predicate.
• Write a Java program to use Java streams on a NavigableSet view to calculate the average of numeric keys.

Java Code Editor:

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