code: public static double min(final double a, final double b) {
          if (a > b) {
              return b;
          }
          if (a < b) {
              return a;
          }
          /* if either arg is NaN, return NaN */
          if (a != b) {
              return Double.NaN;
          }
          /* min(+0.0,-0.0) == -0.0 */
          /* 0x8000000000000000L == Double.doubleToRawLongBits(-0.0d) */
          long bits = Double.doubleToRawLongBits(a);
          if (bits == 0x8000000000000000L) {
              return a;
          }
          return b;
      }
docs: Compute the minimum of two values
  @param a first value
  @param b second value
  @return a if a is lesser or equal to b, b otherwise