Arrays and Variable Length Parameters List

Submitted by GeePee on Wednesday, May 27, 2015 - 22:25.
Arrays and Variable Length Parameters List The following Java program application uses Arrays and Variable Length Parameters List. I will be using the JCreator IDE in developing the program. To start in this tutorial, first open the JCreator IDE, click new and paste the following code.
  1. import java.util.*;
  2.  
  3. public class LargestNumber
  4. {
  5.         public static void main(String[] args)
  6.         {
  7.                 double[] numberList = {23, 45.5, 89,34, 92.78, 36, 90, 120.89,
  8.                                 97, 23, 90, 89};
  9.                
  10.                 System.out.println("The larger 0f 5.6 and 10.8 is: "
  11.                                 + largest(5.6, 10.8));
  12.                                
  13.                 System.out.println("The largest  of 23, 78, and 56 is: "
  14.                                 + largest(23,78, 56));
  15.                
  16.                 System.out.println("The largest number of 93, 28, 83 and 66 is: "
  17.                                 + largest(93, 28, 83, 66));
  18.                
  19.                 System.out.println("The largest of 22.5 , 12.34, 56.34, 78, "
  20.                         + "\n"
  21.                                 + "98.45, 25, 78, 23 and 36 is: "
  22.                                 + largest(22.5, 12.34, 56.34, 78, 98.45, 25, 78, 23, 36));
  23.                
  24.                 System.out.println("The largest number in  numList is: "
  25.                                                         + largest(numberList));
  26.                                                        
  27.                 System.out.println("A call to the method largest with empty \n"
  28.                         + " parameter list returns the value " + largest());
  29.        
  30.                
  31.                 }
  32.                 public static double largest(double ... numList)
  33.                 {
  34.                         double max;
  35.                         int index;
  36.                        
  37.                         if (numList.length != 0)
  38.                         {
  39.                                 max = numList[0];
  40.                                
  41.                                 for (index = 1; index < numList.length; index++)
  42.                                 {      
  43.                                         if (max < numList [index])
  44.                                                 max = numList [index];
  45.                                                
  46.                                 }
  47.                                 return max;
  48.                         }
  49.                         return 0.0;
  50.                
  51.         }
  52. }
Sample Run: The larger 0f 5.6 and 10.8 is: 10.8 The largest of 23, 78, and 56 is: 78.0 The largest number of 93, 28, 83 and 66 is: 93.0 The largest of 22.5 , 12.34, 56.34, 78, 98.45, 25, 78, 23 and 36 is: 98.45 The largest number in numList is: 120.89 A call to the method largest with empty parameter list returns the value 0.0 The preceding program works as follows: The method
  1.  System.out.println("The larger 0f 5.6 and 10.8 is: "
  2.                                 + largest(5.6, 10.8));
is called with two parameters; Three parameters
  1.  System.out.println("The largest  of 23, 78, and 56 is: "
  2.                                 + largest(23,78, 56));
Four parameters
  1.  System.out.println("The largest number of 93, 28, 83 and 66 is: "
  2.                                 + largest(93, 28, 83, 66));
And
  1.  System.out.println("The largest of 22.5 , 12.34, 56.34, 78, "
  2.                         + "\n"
  3.                                 + "98.45, 25, 78, 23 and 36 is: "
  4.                                 + largest(22.5, 12.34, 56.34, 78, 98.45, 25, 78, 23, 36));
nine parameters. The statement
  1.  System.out.println("The largest number in  numList is: "
  2.                                                         + largest(numberList));
the method largest is called using an array of numbers. The statement
  1.  System.out.println("A call to the method largest with empty \n"
  2.                         + " parameter list returns the value " + largest());
is called no parameters.
Tags
Arrays
Variable
parameter
java