[Java] Make collections non-final. Fix #133

agrona/src/main/java/org/agrona/collections/BiInt2ObjectMap.java

@@ -28,7 +28,7 @@
  *
  * @param <V> type of the object stored in the map.
  */
-public final class BiInt2ObjectMap<V> implements Serializable
+public class BiInt2ObjectMap<V> implements Serializable
 {
     /**
      * Handler for a map entry

agrona/src/main/java/org/agrona/collections/Int2IntCounterMap.java

@@ -28,7 +28,7 @@
  * A open-addressing with linear probing hash map specialised for primitive key and counter pairs. A counter map views
  * counters which hit {@link #initialValue} as deleted. This means that changing a counter may impact {@link #size()}.
  */
-public final class Int2IntCounterMap implements Serializable
+public class Int2IntCounterMap implements Serializable
 {
     @DoNotSub private static final int MIN_CAPACITY = 8;
 

agrona/src/main/java/org/agrona/collections/Int2IntHashMap.java

@@ -29,7 +29,7 @@
 /**
  * A open addressing with linear probing hash map specialised for primitive key and value pairs.
  */
-public final class Int2IntHashMap implements Map<Integer, Integer>, Serializable
+public class Int2IntHashMap implements Map<Integer, Integer>, Serializable
 {
     @DoNotSub private static final int MIN_CAPACITY = 8;
 

agrona/src/main/java/org/agrona/collections/Int2ObjectCache.java

@@ -40,7 +40,7 @@
  *
  * @param <V> type of values stored in the {@link Map}
  */
-public final class Int2ObjectCache<V>
+public class Int2ObjectCache<V>
     implements Map<Integer, V>, Serializable
 {
     private long cachePuts = 0;

agrona/src/main/java/org/agrona/collections/IntArrayList.java

@@ -25,7 +25,7 @@
 /**
  * A {@link List} implementation that stores int values with the ability to not have them boxed.
  */
-public final class IntArrayList extends AbstractList<Integer> implements List<Integer>, RandomAccess, Serializable
+public class IntArrayList extends AbstractList<Integer> implements List<Integer>, RandomAccess, Serializable
 {
     /**
      * The default value that will be used in place of null for an element.

agrona/src/main/java/org/agrona/collections/IntHashSet.java

@@ -39,7 +39,7 @@
  * @see IntIterator
  * @see Set
  */
-public final class IntHashSet extends AbstractSet<Integer> implements Serializable
+public class IntHashSet extends AbstractSet<Integer> implements Serializable
 {
     /**
      * The initial capacity used when none is specified in the constructor.

agrona/src/main/java/org/agrona/collections/Object2IntHashMap.java

@@ -35,7 +35,7 @@
  *
  * @param <K> type of keys stored in the {@link java.util.Map}
  */
-public final class Object2IntHashMap<K>
+public class Object2IntHashMap<K>
     implements Map<K, Integer>, Serializable
 {
     @DoNotSub private static final int MIN_CAPACITY = 8;

agrona/src/main/java/org/agrona/collections/ObjectHashSet.java

@@ -37,7 +37,7 @@
  * @see ObjectIterator
  * @see Set
  */
-public final class ObjectHashSet<T> extends AbstractSet<T> implements Serializable
+public class ObjectHashSet<T> extends AbstractSet<T> implements Serializable
 {
     /**
      * The initial capacity used when none is specified in the constructor.