Божков Костя Задание 9.1

09-java-generics-collections/task01/src/com/example/task01/Pair.java

@@ -2,4 +2,64 @@
 
 public class Pair {
     // TODO напишите реализацию
-}
+import java.util.function.BiConsumer;
+
+    public class Pair<T, U>
+    {
+        private final T first;
+        private final U second;
+
+        private Pair(T first, U second)
+        {
+            this.first = first;
+            this.second = second;
+        }
+
+        public U getSecond()
+        {
+            //тест падает на null
+            //throw new NoSuchElementException("No second value present");
+            return second;
+        }
+
+        public T getFirst()
+        {
+            //тест падает на null
+            //throw new NoSuchElementException("No first value present");
+            return first;
+        }
+
+        public void ifPresent(BiConsumer<? super T, ? super U> consumer)
+        {
+            if (first != null && second != null) {
+                consumer.accept(first, second);
+            }
+        }
+
+        @Override
+        public boolean equals(Object obj)
+        {
+            if (obj == this)
+            {
+                return true;
+            }
+            if (obj == null || obj.getClass() != this.getClass())
+            {
+                return false;
+            }
+            Pair tmp = (Pair) obj;
+            return (first == tmp.getFirst() || (first != null && tmp.getSecond().equals(tmp.getFirst())))
+                    && (second == tmp.getSecond() || (second != null && second.equals(tmp.getSecond())));
+        }
+
+        @Override
+        public int hashCode()
+        {
+            return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
+        }
+
+        public static <T, U> Pair<T, U> of(T first, U second)
+        {
+            return new Pair<>(first, second);
+        }
+    }