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.

import java.util.*;
 
public class LargestNumber
{
        public static void main(String[] args)
        {
                double[] numberList = {23, 45.5, 89,34, 92.78, 36, 90, 120.89,
                                97, 23, 90, 89};
                
                System.out.println("The larger 0f 5.6 and 10.8 is: "
                                + largest(5.6, 10.8));
                                
                System.out.println("The largest  of 23, 78, and 56 is: "
                                + largest(23,78, 56));
                
                System.out.println("The largest number of 93, 28, 83 and 66 is: "
                                + largest(93, 28, 83, 66));
                
                System.out.println("The largest of 22.5 , 12.34, 56.34, 78, "
                        + "\n"
                                + "98.45, 25, 78, 23 and 36 is: "
                                + largest(22.5, 12.34, 56.34, 78, 98.45, 25, 78, 23, 36));
                
                System.out.println("The largest number in  numList is: "
                                                        + largest(numberList));
                                                        
                System.out.println("A call to the method largest with empty \n"
                        + " parameter list returns the value " + largest());
        
                
                }
                public static double largest(double ... numList)
                {
                        double max;
                        int index;
                        
                        if (numList.length != 0)
                        {
                                max = numList[0];
                                
                                for (index = 1; index < numList.length; index++)
                                {       
                                        if (max < numList [index])
                                                max = numList [index];
                                                
                                }
                                return max;
                        }
                        return 0.0;
                
        }
}

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

 System.out.println("The larger 0f 5.6 and 10.8 is: "
                                + largest(5.6, 10.8));

is called with two parameters; Three parameters

 System.out.println("The largest  of 23, 78, and 56 is: "
                                + largest(23,78, 56));

Four parameters

 System.out.println("The largest number of 93, 28, 83 and 66 is: "
                                + largest(93, 28, 83, 66));

And

 System.out.println("The largest of 22.5 , 12.34, 56.34, 78, "
                        + "\n"
                                + "98.45, 25, 78, 23 and 36 is: "
                                + largest(22.5, 12.34, 56.34, 78, 98.45, 25, 78, 23, 36));

nine parameters. The statement

 System.out.println("The largest number in  numList is: "
                                                        + largest(numberList));

the method largest is called using an array of numbers. The statement

 System.out.println("A call to the method largest with empty \n"
                        + " parameter list returns the value " + largest());

is called no parameters.

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