ARRAYS - Java Programming: From Problem Analysis to Program Design - page 582

Consider the following method definition:
public static double largest( double ... list)
{

double max;

if (list.length != 0)
{

max = list[0];

for ( int index = 1; index < list.length; index++)
{

if (max < list[index])
max = list[index];

}

return max;

}

return 0.0;

}
The formal parameter list of the method largest is of variable length. In a call to
the method largest , you can specify either any number of actual parameters of type
double or an array of type double . If the actual parameters of the method largest
are of type double , then the values of the actual parameters are put in the array
list . Because the number of actual parameters can be zero, in which case the length
of list is 0 , before determining the largest number in list we check whether the
length of list is 0 .
Consider the following statements:

double num1 = largest(34, 56); //Line 1

double num2 = largest(12.56, 84, 92); //Line 2

double num3 = largest(98.32, 77, 64.67, 56); //Line 3

System.out.println(largest(22.50, 67.78,
92.58, 45, 34, 56)); //Line 4

double [] numberList = {18.50, 44, 56.23, 17.89,
92.34, 112.0, 77, 11, 22,
86.62); //Line 5

System.out.println(largest(numberList)); //Line 6

In Line 1, the method largest is called with two parameters; in Line 2 it is called with
three parameters; in Line 3 it is called with four parameters; and in Line 4 it is called with
six parameters. In Line 6, the actual parameter of the method largest is the array
numberList .