Use final

Author: garydgregory

src/main/java/org/apache/commons/io/StreamIterator.java

@@ -29,7 +29,7 @@
  * @param <E> The stream and iterator type.
  * @since 2.9.0
  */
-class StreamIterator<E> implements Iterator<E>, Closeable {
+final class StreamIterator<E> implements Iterator<E>, Closeable {
 
     /**
      * Wraps and presents a stream as a closable resource that automatically closes itself when reaching the end of

src/main/java/org/apache/commons/io/ThreadMonitor.java

@@ -37,7 +37,7 @@
  * }
  * </pre>
  */
-class ThreadMonitor implements Runnable {
+final class ThreadMonitor implements Runnable {
 
     /**
      * Starts monitoring the current thread.

src/main/java/org/apache/commons/io/UncheckedIOExceptions.java

@@ -26,7 +26,7 @@
  *
  * @since 2.12.0
  */
-class UncheckedIOExceptions {
+final class UncheckedIOExceptions {
 
     /**
      * Creates a new UncheckedIOException for the given detail message.