Added some missing @param and @throws Javadoc comments.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/beatmap/BeatmapParser.java

@@ -728,6 +728,7 @@ public class BeatmapParser {
 
 	/**
 	 * Returns the file extension of a file.
+	 * @param file the file name
 	 */
 	public static String getExtension(String file) {
 		int i = file.lastIndexOf('.');

src/itdelatrisu/opsu/beatmap/BeatmapSet.java

@@ -47,7 +47,7 @@ public class BeatmapSet implements Iterable<Beatmap> {
 	/**
 	 * Returns the beatmap at the given index.
 	 * @param index the beatmap index
-	 * @throws IndexOutOfBoundsException
+	 * @throws IndexOutOfBoundsException if the index is out of range
 	 */
 	public Beatmap get(int index) { return beatmaps.get(index); }
 
@@ -55,7 +55,7 @@ public class BeatmapSet implements Iterable<Beatmap> {
 	 * Removes the beatmap at the given index.
 	 * @param index the beatmap index
 	 * @return the removed beatmap
-	 * @throws IndexOutOfBoundsException
+	 * @throws IndexOutOfBoundsException if the index is out of range
 	 */
 	public Beatmap remove(int index) { return beatmaps.remove(index); }
 
@@ -72,7 +72,7 @@ public class BeatmapSet implements Iterable<Beatmap> {
 	 * <li>4: CS:{} HP:{} AR:{} OD:{} Stars:{}
 	 * </ul>
 	 * @param index the beatmap index
-	 * @throws IndexOutOfBoundsException
+	 * @throws IndexOutOfBoundsException if the index is out of range
 	 */
 	public String[] getInfo(int index) {
 		Beatmap beatmap = beatmaps.get(index);

src/itdelatrisu/opsu/beatmap/BeatmapSetList.java

@@ -330,6 +330,7 @@ public class BeatmapSetList {
 	/**
 	 * Expands the node at an index by inserting a new node for each Beatmap
 	 * in that node and hiding the group node.
+	 * @param index the node index
 	 * @return the first of the newly-inserted nodes
 	 */
 	public BeatmapSetNode expand(int index) {

src/itdelatrisu/opsu/beatmap/BeatmapWatchService.java

@@ -129,7 +129,11 @@ public class BeatmapWatchService {
 
 	/** Watch service listener interface. */
 	public interface BeatmapWatchServiceListener {
-		/** Indication that an event was received. */
+		/**
+		 * Indication that an event was received.
+		 * @param kind the event kind
+		 * @param child the child directory
+		 */
 		public void eventReceived(WatchEvent.Kind<?> kind, Path child);
 	}