Difference Between keySet() vs value() Method in Java Map

// Java program demonstrating use of keySet() method

// Importing HashMap, Iterator, MAp and Stream classes
// from java.util package
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.stream.Stream;

// Class
class GFG {

    // Main driver method
    public static void main(String[] args)
    {
        // Creating object of Map Class
        // Declaring object of Interfere and string type
        Map<Integer, String> map = new HashMap<>();

        // Adding the elements to the objects
        // Elements here are key-value pairs in the map

        // Custom input entries
        map.put(1, "Geeks");
        map.put(2, "For");
        map.put(3, "Geeks");

        // Now, different ways of iteration are illustrated
        // to showcase keySet() method

        // Way 1
        // Iterating the keySet() using iterator

        // Creating an object of Integer type
        Iterator<Integer> itr = map.keySet().iterator();

        // Condition check where hasNext() method holds true
        // till there is single element remaining in the List
        while (itr.hasNext()) {

            // Print all the elements(key-value pairs)
            System.out.print(itr.next() + " ");
        }

        // New line
        System.out.println();

        // Way 2
        // Iterating the keySet()
        // using for loop
        for (Integer key : map.keySet()) {

            // Print all the key-value pairs
            System.out.print(key + " ");
        }

        // New line
        System.out.println();

        // Way 3
        // Iterating over the keySet() by
        // converting the map to the string
        // using the toString() method
        System.out.println(map.keySet().toString());
    }
}

// Java program demonstrating use of values() method

// Importing several classes from
// java.util package
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.stream.Stream;

// Class
// Main class
public class GFG {

    // Main driver method
    public static void main(String[] args)
    {
        // Making map of Integer keys and String values
        Map<Integer, String> map = new HashMap<>();

        // Adding the elements to the above object
        // Declaring object of Integer and String type

        // Elements here are key-value pairs
        // Custom input entries
        map.put(1, "Geeks");
        map.put(2, "For");
        map.put(3, "Geeks");

        // values() method implemented by
        // demonstrating different ways of traversal

        // Way 1
        // Iterating the values() method
        // using iterator
        Iterator itr = map.values().iterator();

        // Condition check using hasNet() method which
        // holds true till there is single element remaining
        while (itr.hasNext()) {
            System.out.print(itr.next() + " ");
        }
        System.out.println();

        // Way 2
        // Iterating the values() method
        // using for each loop
        for (String key : map.values()) {
            System.out.print(key + " ");
        }
        System.out.println();

        // Way 3
        // iterating over the values() method
        // by converting the map to the string
        // using the toString() method
        System.out.println(map.values().toString());
    }
}