Решение задачи 3

src/com/school/faang/hashmap/задача_3/Solution.java

@@ -1,7 +1,53 @@
 package com.school.faang.hashmap.задача_3;
 
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
 public class Solution {
     public static void main(String[] args) {
+        Map<Product, Integer> basket = new HashMap<>();
+        int counter = 0;
+
+        Product phone = new Product("@qwerty", "Phone 16");
+        Product iPhone = new Product("@qwerty", "Phone 16");
+
+        basket.put(phone, ++counter);
+        basket.put(iPhone, ++counter);
+
+        System.out.println(basket);
+    }
+}
+
+class Product {
+    private String productId;
+    private String name;
+
+    private Product product;
+
+    public Product(String productId, String name) {
+        this.productId = productId;
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Product product = (Product) o;
+        return Objects.equals(productId, product.productId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productId);
+    }
 
+    @Override
+    public String toString() {
+        return "Product{" +
+                "productId='" + productId + '\'' +
+                ", name='" + name + '\'' +
+                '}';
     }
 }