Question

- Write a method sum that expects a List<Integer> as a parameter. The method returns an int representing the sum of the integers in the list.

- Write an index-based loop that prints the contents of a list.

Answer 1

Java Program:

import java.util.*;

//Class that holds list of integers
public class ListIntegers
{
   //Main method
   public static void main(String[] args)
   {
       //List of integers
       List<Integer> integers = new ArrayList<Integer>();
      
       //Adding element in the list
       integers.add(23);
       integers.add(6);
       integers.add(18);    
       integers.add(4);    
       integers.add(14);
      
       System.out.println("\n\n Elements present in the list: \n");
       //Printing elements in the list
       print(integers);
      
       //Calculating sum of elements in the list
       int sumOfIntegers = sum(integers);
      
       //Printing sum
       System.out.println("\n\n Sum of elements in the list: " + sumOfIntegers + " \n");
   }
  
   //Method that prints the elements in the list using index-based loop
   public static void print(List<Integer> integers)
   {
       //Iterating over list
       for(int i=0; i<integers.size(); i++)
       {
           //Printing element
           System.out.print( " \t " + integers.get(i) );
       }
   }
  
   //Method that finds the sum of elements in the list
   public static int sum(List<Integer> integers)
   {
       int sum = 0;
      
       //Iterating over list
       for(int i=0; i<integers.size(); i++)
       {
           //Accumulating sum
           sum += integers.get(i);
       }
      
       //Return the sum of elements in the list
       return sum;
   }
}

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Sample Output: