Master the Collection Framework in 7 days - Example of HashSet, LinkedHashSet, TreeSet

Are you ready to take your Java skills to the next level? Join our 7-Day Mini Challenge and dive deep into the Collection Framework like never before!

Today is Day-04.
In todays challenge, let us learn about Set and its implementation classes

Day:04 Tasks
Basic
1.a HashSet with Integer values clone it to another HashSet .
2. a HashSet with String names convert a HashSet to a TreeSet
3. a HashSet with String names, reverse the names and create a reverse order view of the elements
4a. find the numbers less than 50 in TreeSet
4b. find the numbers greater than 50 in TreeSet
5a. In a TreeSet of Integer values, get the element which is greater than or = to the given element.
5b. In a TreeSet of Integer values, get the element which is less than or = to the given element.
6a. In a TreeSet of Integer values, get the element strictly greater than the given element.
6b. In a TreeSet of Integer values, get the element strictly lesser than the given element.
7. In a TreeSet with names, reverse and print it
8. In a TreeSet with names, retrieve and remove the first element and last element of a tree set.
9. In a TreeSet with names, print the first and the last element of a tree set.
10. Write a program to remove duplicate strings from an array and store the unique strings in a HashSet.

Advanced
11. Given two HashSet with course names webcourses

a. compare the sets and retain elements that are the same output: web[HTML,REACT]
b. difference (elements that are in one set but not both)print them output: [Spring, Java, CSS]

12. Write a program that reads a paragraph of text, splits it into words, and uses a HashSet to count the number of distinct words
Input: "Java is fun. Java is powerful."
Output: count: 5 distinct words: [Java, is, fun, powerful]

13. Write a program to group strings by their first letter using a TreeSet.
Input is a list: ["apple", "banana", "apricot", "cherry", "blueberry"]
Output should be 3 sets as: ["apple", "apricot"], ["banana", "blueberry"], ["cherry"]

14.Write a program to find the longest string from a set and store all strings of the same length in a HashSet.
Input Example: ["java", "javascript", "python", "kotlin","react","scss"]
Output: prints javascript and the set with strings of same length["python","kotlin","react"] ["java","scss"]

15.Write a program to remove all strings from a HashSet that start with a specific letter (e.g., 'a').
Input: ["apple", "banana", "avocado", "cherry"]
Output (remove 'a'): ["banana", "cherry"]

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🔑 What You'll Learn:
✅ Introduction to Collection Framework
✅ ArrayList, LinkedList, Set, TreeSet, HashMap, TreeMap, and more
✅ How to choose the right collection for your use case
✅ Real-world coding scenarios and challenges

💡 Why This Challenge?
In just 7 days, you'll gain the confidence and knowledge to master one of the most essential topics for Java developers.

This mini-series is designed to provide a hands-on learning experience through task-based challenges.
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Complete the daily tasks and share your answers in the comments or in my private community

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[kingajable]

Hi Ma’am you doing great job. Thank you