Java 10 Map with local variable Var and Different ways to iterate

Java10MapWithLocalVer.java

 package com.java9r;

import java.util.HashMap;

public class Java10MapWithLocalVer {

 public static void main(String[] args) {
  var products = new HashMap<String, Object>();
  products.put("Id", "100");
  products.put("Name", "Product 1");
  products.put("Price", 25.5);
  products.put("Quantity", 75);

  System.out.println("Product Details using foreach loop");
  System.out.println("======================================");
  products.forEach((key, value) -> {
   System.out.println(key + ": " + value);
  });

  System.out.println("Iterate map using Enhanced for loop (keyset)");
  System.out.println("======================================");
  // Map<String, Object> products =new HashMap<String, Object>();
  for (var key : products.keySet()) {
   // String value = products.get(key);
   var value = products.get(key);
   System.out.println(key + ": " + value);
  }

  System.out.println("Iterate map using Enhanced for loop (entrySet)");
  System.out.println("======================================");
  // Map<String, Object> products = new HashMap<String, Object>();
  // for (Map.Entry<String, Object> entry : map.entrySet()) {
  for (var entry : products.entrySet()) {
   System.out.println(entry.getKey() + ": " + entry.getValue());
  }

  System.out.println("Iterate map using while loop");
  System.out.println("======================================");
  // Map<String, Object> products = new HashMap<String, Object>());
  // Iterator<Map.Entry<Integer, Integer>> entries =
  // products.entrySet().iterator();
  var entries = products.entrySet().iterator();
  while (entries.hasNext()) {
   // Map.Entry<Integer, Integer> entry = entries.next();
   var entry = entries.next();
   System.out.println(entry.getKey() + ": " + entry.getValue());
  }

  System.out.println("Product Details Iterating over keys or values using For-Each loop");
  System.out.println("======================================");
  System.out.println("iterating over keys only");
  // Map<String, Object> products = new HashMap<String, Object>();
  // iterating over keys only
  for (var key : products.keySet()) {
   System.out.println("Key = " + key);
  }

  System.out.println("iterating over values only");
  // iterating over values only
  for (var value : products.values()) {
   System.out.println("Value = " + value);
  }

 }
}

Output

Product Details using foreach loop
======================================
Price: 25.5
Quantity: 75
Id: 100
Name: Product 1
Iterate map using Enhanced for loop (keyset)
======================================
Price: 25.5
Quantity: 75
Id: 100
Name: Product 1
Iterate map using Enhanced for loop (entrySet)
======================================
Price: 25.5
Quantity: 75
Id: 100
Name: Product 1
Iterate map using while loop
======================================
Price: 25.5
Quantity: 75
Id: 100
Name: Product 1
Product Details Iterating over keys or values using For-Each loop
======================================
iterating over keys only
Key = Price
Key = Quantity
Key = Id
Key = Name
iterating over values only
Value = 25.5
Value = 75
Value = 100
Value = Product 1