FastSin 2

    public static final class Riven {

        private static final int SIN_BITS, SIN_MASK, SIN_COUNT;
        private static final float radFull, radToIndex;
        private static final float degFull, degToIndex;
        private static final float[] sin, cos;

        static {
            SIN_BITS = 12;
            SIN_MASK = ~(-1 << SIN_BITS);
            SIN_COUNT = SIN_MASK + 1;

            radFull = (float) (Math.PI * 2.0);
            degFull = (float) (360.0);
            radToIndex = SIN_COUNT / radFull;
            degToIndex = SIN_COUNT / degFull;

            sin = new float[SIN_COUNT];
            cos = new float[SIN_COUNT];

            for (int i = 0; i < SIN_COUNT; i++) {
                sin[i] = (float) Math.sin((i + 0.5f) / SIN_COUNT * radFull);
                cos[i] = (float) Math.cos((i + 0.5f) / SIN_COUNT * radFull);
            }

            // Four cardinal directions (credits: Nate)
            for (int i = 0; i < 360; i += 90) {
                sin[(int) (i * degToIndex) & SIN_MASK] = (float) Math.sin(i * Math.PI / 180.0);
                cos[(int) (i * degToIndex) & SIN_MASK] = (float) Math.cos(i * Math.PI / 180.0);
            }
        }

        public static final float sin(float rad) {
            return sin[(int) (rad * radToIndex) & SIN_MASK];
        }

        public static final float cos(float rad) {
            return cos[(int) (rad * radToIndex) & SIN_MASK];
        }
    }