How to Create Subsets of a HashSet based on Specific Criteria in Java?

In Java, HashSet provides a dynamic collection of unique elements. Sometimes, we may need to create subsets of a HashSet based on specific criteria.

In this article, we will learn how to create subsets of a HashSet based on Specific Criteria in Java.

Approach Create Subsets of a HashSet based on Specific Criteria

• Iterate through the original HashSet.
• Define the criteria for selecting elements.
• Create a new HashSet to store the subset.
• Add elements that meet the criteria to the new subset.

Program to Create Subsets of a HashSet based on Specific Criteria in Java

Below is the Program to Create Subsets of a HashSet based on Specific Criteria:

Java

// Java program to create subsets of a
// HashSet by using Iteration
import java.util.HashSet;
import java.util.Set;

public class SubsetExample
{
    public static void main(String[] args)
    {
        // Create a HashSet
        Set<String> originalSet = new HashSet<>();
        originalSet.add("Java");
        originalSet.add("Python");
        originalSet.add("C++");
        originalSet.add("JavaScript");
        originalSet.add("Ruby");

        // Define criteria
        int minCharacters = 4;

        // Create a new HashSet to store the subset
        Set<String> subset = new HashSet<>();

        // Iterate through the original set and add elements
          // that meet the criteria to the subset
        for (String language : originalSet) {
            if (language.length() > minCharacters) {
                subset.add(language);
            }
        }

        System.out.println("Subset based on criteria: " + subset);
    }
}

Output

Subset based on criteria: [JavaScript, Python]

Explanation of the above Program:

• This Java program creates subsets of a HashSet by iterating over its elements.
• Then it adds those elements to meet a specified criteria to a new HashSet.
• In this example, the criteria are to include only elements with a length greater than a specified minimum number of characters.
• At last, it prints the subset based on the criteria.

Note: Customize the criteria and elements in the examples to suit your specific use case.