Java Collection, TreeMap Exercises: Get a reverse order view of the keys contained in a given map
Java Collection, TreeMap Exercises: Exercise-10 with Solution
Write a Java program to get a reverse order view of the keys contained in a given map.
Sample Solution:-
Java Code:
import java.util.*;
import java.util.Map.Entry;
public class Example10 {
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("Reverse order view of the keys: " + tree_map1.descendingKeySet());
}
}
Sample Output:
Orginal TreeMap content: {C1=Green, C2=Red, C3=White, C4=Black} Reverse order view of the keys: [C4, C3, C2, C1]
Java Code Editor:
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Previous: Get the first (lowest) key and the last (highest) key currently in a map.
Next: Get a key-value mapping associated with the greatest key less than or equal to the given key.
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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
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