w3resource

Java Collection, TreeSet Exercises: Create a reverse order view of the elements contained in a given tree set

Java Collection, TreeSet Exercises: Exercise-4 with Solution

Write a Java program to create a reverse order view of the elements contained in a given tree set.

Sample Solution:

Java Code:

import java.util.TreeSet;
import java.util.Iterator;
  public class Exercise4 {
  public static void main(String[] args) {
    // create an empty tree set
     TreeSet<String> t_set = new TreeSet<String>();
   // use add() method to add values in the tree set
          t_set.add("Red");
          t_set.add("Green");
          t_set.add("Black");
          t_set.add("Pink");
          t_set.add("orange");
     // print original list
   System.out.println("Original tree set:" + t_set);  
     Iterator it = t_set.descendingIterator();
     // Print list elements in reverse order
     System.out.println("Elements in Reverse Order:");
     while (it.hasNext()) {
        System.out.println(it.next());
     }
  }
}

Sample Output:

Original tree set:[Black, Green, Pink, Red, orange]                    
Elements in Reverse Order:                                             
orange                                                                 
Red                                                                    
Pink                                                                   
Green                                                                  
Black

Flowchart:

Flowchart: Create a reverse order view of the elements contained in a given tree set

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Add all the elements of a specified tree set to another tree set.
Next: Get the first and last elements in a tree set.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

Ref: https://bit.ly/3xXcFZt