Array min / max value

public class Main {
  public static byte max(byte[] array) {
      if (array == null) {
          throw new IllegalArgumentException("The Array must not be null");
      } else if (array.length == 0) {
          throw new IllegalArgumentException("Array cannot be empty.");
      }/* j  a  v  a2 s.co m*/
      byte max = array[0];
      for (int i = 1; i < array.length; i++) {
          if (array[i] > max) {
              max = array[i];
          }
      }
      return max;
  }
}

public class Main {
  public static double max(double[] array) {
      if (array== null) {
          throw new IllegalArgumentException("The Array must not be null");
      } else if (array.length == 0) {
          throw new IllegalArgumentException("Array cannot be empty.");
      }/* j  av  a  2s. co m*/

      // Finds and returns max
      double max = array[0];
      for (int j = 1; j < array.length; j++) {
          if (Double.isNaN(array[j])) {
              return Double.NaN;
          }
          if (array[j] > max) {
              max = array[j];
          }
      }

      return max;
  }
}

public class Main {
 public static double min(double[] array) {
     if (array == null) {
         throw new IllegalArgumentException("The Array must not be null");
     } else if (array.length == 0) {
         throw new IllegalArgumentException("Array cannot be empty.");
     }//j  av a 2 s . com
     // Finds and returns min
     double min = array[0];
     for (int i = 1; i < array.length; i++) {
         if (Double.isNaN(array[i])) {
             return Double.NaN;
         }
         if (array[i] < min) {
             min = array[i];
         }
     }
     return min;
  }
}