task competed

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> {
+    private static final int SIZE_ARRAY = 10;
+    private K[] keys;
+    private V[] values;
+    private int size;
+
+    public StorageImpl() {
+        this.keys = (K[]) new Object[SIZE_ARRAY];
+        this.values = (V[]) new Object[SIZE_ARRAY];
+        size = 0;
+    }
+
+    private int getIndex(K key) {
+        for (int i = 0; i < size; i++) {
+            if ((key == null && this.keys[i] == null)
+                    || (this.keys[i] != null && this.keys[i].equals(key))) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
     @Override
     public void put(K key, V value) {
+        int index = getIndex(key);
+
+        if (index != -1) {
+            // ключ уже есть → обновляем
+            values[index] = value;
+            return;
+        }
+
+        // ключа нет → добавляем
+        if (size < keys.length) {
+            keys[size] = key;
+            values[size] = value;
+            size++;
+        } else {
+            System.out.println("The storage is full");
+        }
     }
 
     @Override
     public V get(K key) {
-        return null;
+        int index = getIndex(key);
+        return index == -1 ? null : values[index];
     }
 
     @Override
     public int size() {
-        return -1;
+        return size;
     }
 }