Find the max of 3 numbers in Java with different data types

Question

Say I have the following three constants   final static int MY INT1   25  final static int MY INT2   -10  final static double MY DOUBLE1   15 5    I want to take the three of them and use Math max   to find the max of the three but if I pass in more then two values then it gives me an error  For instance      this gives me an error double maxOfNums   Math max MY INT1  MY INT2  MY DOUBLE2     Please let me know what I m doing wrong

User · Answer

If possible  use NumberUtils in Apache Commons Lang - plenty of great utilities there   https   commons apache org proper commons-lang javadocs api-3 1 org apache commons lang3 math NumberUtils html max int     NumberUtils max int

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Like mentioned before  Math max   only takes two arguments  It s not exactly compatible with your current syntax but you could try Collections max     If you don t like that you can always create your own method for it      public class test       final static int MY INT1   25      final static int MY INT2   -10      final static double MY DOUBLE1   15 5       public static void main String args              double maxOfNums   multiMax MY INT1  MY INT2  MY DOUBLE1              public static Object multiMax Object    values            Object returnValue   null          for  Object value   values              returnValue    returnValue    null        value instanceof Integer     Integer  value                        value instanceof Double     Double  value                                Float  value   gt    returnValue instanceof Integer     Integer  returnValue                        returnValue instanceof Double     Double  returnValue                                Float  returnValue     value   returnValue                        value          return returnValue            This will take any number of mixed numeric arguments  Integer  Double and Float  but the return value is an Object so you would have to cast it to Integer  Double or Float   It might also be throwing an error since there is no such thing as  MY DOUBLE2

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int first   3    int mid   4   int last   6     checks for the largest number using the Math max a b  method   for the second argument  b  you just use the same method to check which    value is greater between the second and the third int largest   Math max first  Math max last  mid

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Math max only takes two arguments   If you want the maximum of three  use Math max MY INT1  Math max MY INT2  MY DOUBLE2

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Java 8 way  Works for multiple parameters   Stream of first  second  third  max Integer  compareTo  get

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Math max only takes two arguments  no more and no less   Another different solution to the already posted answers would be using DoubleStream of   double max   DoubleStream of firstValue  secondValue  thirdValue                            max                             getAsDouble

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I have a very simple idea    int smallest   Math min a  Math min b  Math min c  d       Of course  if you have 1000 numbers  it s unusable  but if you have 3 or 4 numbers  its easy and fast   Regards  Norbert

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Without using third party libraries  calling the same method more than once or creating an array  you can find the maximum of an arbitrary number of doubles like so  public static double max double    n        int i   0      double max   n i        while    i  lt  n length          if  n i   gt  max              max   n i        return max      In your example  max could be used like this  final static int MY INT1   25  final static int MY INT2   -10  final static double MY DOUBLE1   15 5   public static void main String   args        double maxOfNums   max MY INT1  MY INT2  MY DOUBLE1

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Simple way without methods  int x   1  y   2  z   3   int biggest   x  if  y  gt  biggest        biggest   y    if  z  gt  biggest        biggest   z    System out println biggest         System out println Math max Math max x y  z

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you can use this    Collections max Arrays asList 1 2 3 4      or create a function  public static int max Integer    vals        return Collections max Arrays asList vals

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if you want to do a simple  it will be like this      Fig  6 3  MaximumFinder java    Programmer-declared method maximum with three double parameters  import java util Scanner   public class MaximumFinder        obtain three floating-point values and locate the maximum value   public static void main String   args             create Scanner for input from command window     Scanner input   new Scanner System in           prompt for and input three floating-point values     System out print         Enter three floating-point values separated by spaces          double number1   input nextDouble       read first double     double number2   input nextDouble       read second double     double number3   input nextDouble       read third double         determine the maximum value     double result   maximum number1  number2  number3           display maximum value     System out println  Maximum is      result             returns the maximum of its three double parameters             public static double maximum double x  double y  double z                                                                             double maximumValue   x     assume x is the largest to start         determine whether y is greater than maximumValue              if  y  gt  maximumValue                                               maximumValue   y                                                  determine whether z is greater than maximumValue              if  z  gt  maximumValue                                               maximumValue   z                                               return maximumValue                                                                                                                 end class MaximumFinder   and the output will be something like this  Enter three floating-point values separated by spaces  9 35 2 74 5 1 Maximum is  9 35   References Java    How To Program  Early Objects   Tenth Edition

User · Answer

You can do like this   public static void main String   args         int x 2   y 7  z 14      int max1  Math max x y        System out println  Max value is     Math max max1  z

[java] Find the max of 3 numbers in Java with different data types

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