Update #47 - Singleplayer lag fixes

sources/main/java/com/carrotsearch/hppc/Preallocable.java

@@ -0,0 +1,21 @@
+/*
+ * HPPC
+ *
+ * Copyright (C) 2010-2024 Carrot Search s.c. and contributors
+ * All rights reserved.
+ *
+ * Refer to the full license file "LICENSE.txt":
+ * https://github.com/carrotsearch/hppc/blob/master/LICENSE.txt
+ */
+package com.carrotsearch.hppc;
+
+/** Anything that can preallocate buffers given prior knowledge of the number of stored elements. */
+public interface Preallocable {
+  /**
+   * Ensure this container can hold at least the given number of elements without resizing its
+   * buffers.
+   *
+   * @param expectedElements The total number of elements, inclusive.
+   */
+  public void ensureCapacity(int expectedElements);
+}