small fixes

Author: micycle1

src/main/java/clipper2/Clipper.java

@@ -1082,7 +1082,7 @@ public static PathD RamerDouglasPeucker(PathD path, double epsilon) {
 		if (len < 5) {
 			return path;
 		}
-		List<Boolean> flags = new ArrayList<>(Arrays.asList(new Boolean[len]));
+		List<Boolean> flags = new ArrayList<>(Collections.nCopies(len, false));
 		flags.set(0, true);
 		flags.set(len - 1, true);
 		RDP(path, 0, len - 1, Sqr(epsilon), flags);
@@ -1482,7 +1482,7 @@ public static Path64 Ellipse(Point64 center, double radiusX, double radiusY, int
 		double co = Math.cos(2 * Math.PI / steps);
 		double dx = co, dy = si;
 		Path64 result = new Path64(steps);
-		result.add(new Point64(center.x + radiusX, center.x));
+		result.add(new Point64(center.x + radiusX, center.y));
 		for (int i = 1; i < steps; ++i) {
 			result.add(new Point64(center.x + radiusX * dx, center.y + radiusY * dy));
 			double x = dx * co - dy * si;

src/main/java/clipper2/engine/Clipper64.java

@@ -98,7 +98,7 @@ public final boolean Execute(ClipType clipType, FillRule fillRule, PolyTree64 po
 
 	@Override
 	public void AddReuseableData(ReuseableDataContainer64 reuseableData) {
-		this.AddReuseableData(reuseableData);
+		super.AddReuseableData(reuseableData);
 	}
 
 }

src/main/java/clipper2/offset/ClipperOffset.java

@@ -579,8 +579,9 @@ private void OffsetOpenPath(Group group, Path64 path) {
 		pathOut = new Path64();
 		int highI = path.size() - 1;
 		if (highI < 1) { // A path with 0 or 1 points can't be offset this way.
-			if (highI == 0)
+			if (highI == 0) {
 				solution.add(new Path64(path));
+			}
 			return;
 		}