#192: Some code cleanup.

Signed-off-by: Franz Wilhelmstötter <franz.wilhelmstoetter@gmail.com>

Author: jenetics

jpx/src/main/java/io/jenetics/jpx/Filters.java

@@ -93,7 +93,7 @@ public static List<Track> mergeTracks(final List<Track> tracks) {
 		return tracks.isEmpty()
 			? List.of()
 			: List.of(
-				tracks.get(0).toBuilder()
+				tracks.getFirst().toBuilder()
 					.segments(segments)
 					.build()
 				);
@@ -125,7 +125,7 @@ public static List<Track> fullyMergeTracks(final List<Track> tracks) {
 		return tracks.isEmpty()
 			? List.of()
 			: List.of(
-				tracks.get(0).toBuilder()
+				tracks.getFirst().toBuilder()
 					.segments(List.of(TrackSegment.of(points)))
 					.build()
 				);

jpx/src/main/java/io/jenetics/jpx/Route.java

@@ -861,13 +861,13 @@ static Route read(final DataInput in) throws IOException {
 	private static String url(final Route route) {
 		return route.getLinks().isEmpty()
 			? null
-			: route.getLinks().get(0).getHref().toString();
+			: route.getLinks().getFirst().getHref().toString();
 	}
 
 	private static String urlname(final Route route) {
 		return route.getLinks().isEmpty()
 			? null
-			: route.getLinks().get(0).getText().orElse(null);
+			: route.getLinks().getFirst().getText().orElse(null);
 	}
 
 	// Define the necessary writers for the different versions.

jpx/src/main/java/io/jenetics/jpx/Speed.java

@@ -88,7 +88,6 @@ public enum Unit {
 		 * Convert the given speed value of the given {@code sourceUnit} into a
 		 * speed value of {@code this} speed unit. The given example converts 3
 		 * knots into kilometers per hour.
-		 *
 		 * {@snippet lang="java":
 		 * final double kilometersPerHour = KILOMETERS_PER_HOUR.convert(3, KNOTS);
 		 * }

jpx/src/main/java/io/jenetics/jpx/Track.java

@@ -839,13 +839,13 @@ static Track read(final DataInput in) throws IOException {
 	private static String url(final Track track) {
 		return track.getLinks().isEmpty()
 			? null
-			: track.getLinks().get(0).getHref().toString();
+			: track.getLinks().getFirst().getHref().toString();
 	}
 
 	private static String urlname(final Track track) {
 		return track.getLinks().isEmpty()
 			? null
-			: track.getLinks().get(0).getText().orElse(null);
+			: track.getLinks().getFirst().getText().orElse(null);
 	}
 
 	// Define the necessary writers for the different versions.

jpx/src/main/java/io/jenetics/jpx/WayPoint.java

@@ -1945,13 +1945,13 @@ static WayPoint read(final DataInput in) throws IOException {
 	private static String url(final WayPoint point) {
 		return point.getLinks().isEmpty()
 			? null
-			: point.getLinks().get(0).getHref().toString();
+			: point.getLinks().getFirst().getHref().toString();
 	}
 
 	private static String urlname(final WayPoint point) {
 		return point.getLinks().isEmpty()
 			? null
-			: point.getLinks().get(0).getText().orElse(null);
+			: point.getLinks().getFirst().getText().orElse(null);
 	}
 
 	// Define the necessary writers for the different versions.

jpx/src/main/java/io/jenetics/jpx/XMLReader.java

@@ -99,7 +99,6 @@ enum Type {
 
 	/**
 	 * Read the given type from the underlying XML stream {@code reader}.
-	 *
 	 * {@snippet lang="java":
 	 * try (AutoCloseableXMLStreamReader xml = XML.reader(in)) {
 	 *     // Move XML stream to first element.

jpx/src/main/java/io/jenetics/jpx/XMLWriter.java

@@ -109,7 +109,6 @@ void write(final XMLStreamWriter xml, final T data)
 	/**
 	 * Writes the attribute with the given {@code name} to the current
 	 * <em>outer</em> element.
-	 *
 	 * {@snippet lang="java":
 	 * final XMLWriter<String> writer1 = elem("element", attr("attribute"));
 	 * }