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Java Collection, HashSet Exercises: Convert a hash set to a tree set

Java Collection, HashSet Exercises: Exercise-8 with Solution

Write a Java program to convert a hash set to a tree set.

Sample Solution:

Java Code:

import java.util.*;
  public class Exercise8 {
  public static void main(String[] args) {
         // Create a empty hash set
     HashSet<String> h_set = new HashSet<String>();
   // use add() method to add values in the hash set
          h_set.add("Red");
          h_set.add("Green");
          h_set.add("Black");
          h_set.add("White");
          h_set.add("Pink");
          h_set.add("Yellow");
      System.out.println("Original Hash Set: " + h_set);
    
     // Creat a TreeSet of HashSet elements
     Set<String> tree_set = new TreeSet<String>(h_set);
 
     // Display TreeSet elements
     System.out.println("TreeSet elements: ");
     for(String element : tree_set){
        System.out.println(element);
     }
  }
}

Sample Output:

Original Hash Set: [Red, White, Pink, Yellow, Black, Green]            
TreeSet elements:                                                      
Black                                                                  
Green                                                                  
Pink                                                                   
Red                                                                    
White                                                                  
Yellow

Pictorial Presentation:

Java Collection, ArrayList Exercises: Convert a hash set to a tree set

Flowchart:

Flowchart: Convert a hash set to a tree set.

Java Code Editor:

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Next: Convert a hash set to a List/ArrayList.

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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