First solution by Viodon

src/main/java/core/basesyntax/impl/StorageImpl.java

@@ -3,17 +3,55 @@
 import core.basesyntax.Storage;
 
 public class StorageImpl<K, V> implements Storage<K, V> {
+
+    public static final int MAX_SIZE = 10;
+    private Object[] keys = new Object[MAX_SIZE];
+    private Object[] values = new Object[MAX_SIZE];
+
     @Override
     public void put(K key, V value) {
+        for (int i = 0; i < keys.length; i++) {
+            if (keys[i] != null && keys[i].equals(key)) {
+                values[i] = value;
+                return;
+            }
+            if (keys[i] == key) {
+                values[i] = value;
+                return;
+            }
+            if (keys[i] == null && values[i] == null) {
+                values[i] = value;
+                keys[i] = key;
+                return;
+            }
+
+        }
     }
 
     @Override
     public V get(K key) {
+
+        for (int i = 0; i < keys.length; i++) {
+            if (keys[i] != null && keys[i].equals(key)) {
+                return (V) values[i];
+            }
+            if (keys[i] == null && key == null) {
+                return (V) values[i];
+            }
+        }
         return null;
     }
 
     @Override
     public int size() {
-        return -1;
+        int size = 0;
+
+        for (int i = 0; i < values.length; i++) {
+            if (values[i] != null) {
+                size++;
+            }
+        }
+        return size;
     }
+
 }