Implemented the Storage of the key-value

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

@@ -3,17 +3,66 @@
 import core.basesyntax.Storage;
 
 public class StorageImpl<K, V> implements Storage<K, V> {
+    private static final int MAX_SIZE = 10;
+    private final K[] keys;
+    private final V[] values;
+    private int size;
+
+    public StorageImpl() {
+        //noinspection unchecked
+        keys = (K[]) new Object [MAX_SIZE];
+        //noinspection unchecked
+        values = (V[]) new Object [MAX_SIZE];
+        size = 0;
+    }
+
     @Override
     public void put(K key, V value) {
+        if (size >= MAX_SIZE) {
+            throw new RuntimeException("Storage is full, cannot add more elements.");
+        }
+
+        if (key == null) {
+            for (int i = 0; i < size; i++) {
+                if (keys[i] == null) {
+                    values[i] = value;
+                    return;
+                }
+            }
+            keys[size] = null;
+        } else {
+            for (int i = 0; i < size; i++) {
+                if (keys[i] != null && keys[i].equals(key)) {
+                    values[i] = value;
+                    return;
+                }
+            }
+            keys[size] = key;
+        }
+        values[size] = value;
+        size++;
     }
 
     @Override
     public V get(K key) {
+        if (key == null) {
+            for (int i = 0; i < size; i++) {
+                if (keys[i] == null) {
+                    return values[i];
+                }
+            }
+        } else {
+            for (int i = 0; i < size; i++) {
+                if (keys[i] != null && keys[i].equals(key)) {
+                    return values[i];
+                }
+            }
+        }
         return null;
     }
 
     @Override
     public int size() {
-        return -1;
+        return size;
     }
 }