Adding an Element

Part of the Logic & Flow section of Coddy's Java journey — lesson 23 of 59.

The add(element) method adds an element to the HashSet if it is not already present.

Create an empty HashSet

HashSet<String> fruits = new HashSet<>();

Add "Apple" to the set

fruits.add("Apple");

After executing the above code, the set fruits contains:

["Apple"]

Challenge

Easy

Create a method named <strong>addElement</strong> that takes two arguments:

A HashSet of Strings (set)
A String (element) to add
The method should add the given element to the set and then print the updated set.

Cheat sheet

The add(element) method adds an element to the HashSet if it is not already present.

Create an empty HashSet:

HashSet<String> fruits = new HashSet<>();

Add an element to the set:

fruits.add("Apple");

Try it yourself

import java.util.HashSet;
import java.util.Scanner;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;

public class Main {
    public static void addElement(HashSet<String> set, String element) {
        // Write your code here
    }
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        // Read JSON string representing a HashSet (e.g., ["Apple","Banana"])
        String setString = scanner.nextLine();
        // Read the element to add (e.g., "Cherry")
        String element = scanner.nextLine();
        
        Type setType = new TypeToken<HashSet<String>>(){}.getType();
        HashSet<String> set = new Gson().fromJson(setString, setType);
        
        addElement(set, element);
    }
}