Difference Between keySet() and entrySet() Method in Java Map

// Java program demonstrating use of keySet()

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.stream.Stream;

class GFG {
    public static void main(String[] args)
    {
        // making map of Integer keys and String values
        Map<Integer, String> map = new HashMap<>();
      
        // adding the key-value pairs to map
        map.put(1, "Geeks");
        map.put(2, "For");
        map.put(3, "Geeks");

        // below are the different and simple ways out of
        // many  to iterate over the keySet()

        // iterating the keySet() using iterator
        Iterator<Integer> itr = map.keySet().iterator();
      
        while (itr.hasNext())
        {
            System.out.print(itr.next() + " ");
        }
        System.out.println();

        // iterating the keySet() using for loop
        for (Integer key : map.keySet()) {
            System.out.print(key + " ");
        }

        System.out.println();
      
        // iterating over the keySet() by converting the map
        // to the string
        System.out.println(map.keySet().toString());
    }
}

// Java program demonstrating use of  entrySet()

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.stream.Stream;

class GFG {
    public static void main(String[] args)
    {
        // making map of Integer keys and String values
        Map<Integer, String> map = new HashMap<>();
      
        // adding the key-value pairs to map
        map.put(1, "Geeks");
        map.put(2, "For");
        map.put(3, "Geeks");

        // below are the different and simple ways out of
        // many  to iterate over the entrySet()

        // iterating the key value pair using for each loop
        for (Map.Entry<Integer, String> entry :map.entrySet()) 
        {
            Integer key = (Integer)entry.getKey();
            String value = entry.getValue();

            System.out.println(key + "=" + value);
        }
      
        // iterating the key-value pairs using iterator
        Iterator<Map.Entry<Integer, String> > itr = map.entrySet().iterator();
      
        while (itr.hasNext()) {
            System.out.println(itr.next());
        }
      
        // iterating the key-value pairs using Stream.of()
        // method
        Stream.of(map.entrySet().toArray())
            .forEach(System.out::println);
    }
}