Java Collection, TreeMap Exercises: Get the first (lowest) key and the last (highest) key currently in a map
Java Collection, TreeMap Exercises: Exercise-9 with Solution
Write a Java program to get the first (lowest) key and the last (highest) key currently in a map.
Sample Solution:-
Java Code:
import java.util.*;
import java.util.Map.Entry;
public class Example9 {
public static void main(String args[]) {
// Create a tree map
TreeMap <String,String> tree_map1 = new TreeMap <String,String> ();
// Put elements to the map
tree_map1.put("C2", "Red");
tree_map1.put("C1", "Green");
tree_map1.put("C4", "Black");
tree_map1.put("C3", "White");
System.out.println("Orginal TreeMap content: " + tree_map1);
System.out.println("Greatest key: " + tree_map1.firstKey());
System.out.println("Least key: " + tree_map1.lastKey());
}
}
Sample Output:
Orginal TreeMap content: {C1=Green, C2=Red, C3=White, C4=Black} Greatest key: C1 Least key: C4
Java Code Editor:
Contribute your code and comments through Disqus.
Previous: Get a key-value mapping associated with the greatest key and the least key in a map.
Next: Get a reverse order view of the keys contained in a given map.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
Ref: https://bit.ly/32urdSe
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework