Solution

src/main/java/core/basesyntax/BlockingQueue.java

@@ -12,16 +12,23 @@ public BlockingQueue(int capacity) {
     }
 
     public synchronized void put(T element) throws InterruptedException {
-        // write your code here
+        while (queue.size() == capacity) {
+            wait();
+        }
+        queue.add(element);
+        notify();
+
     }
 
     public synchronized T take() throws InterruptedException {
-        // write your code here
-        return null;
+        while (isEmpty()) {
+            wait();
+        }
+        notify();
+        return queue.remove();
     }
 
     public synchronized boolean isEmpty() {
-        // write your code here
-        return true;
+        return queue.isEmpty();
     }
 }