Question

Write one Java application based on the following directions and algorithms. Make sure the results from each of the bulleted items is separate and easy to read/understand.

• Create an array that will hold 4 string values. Write three separate statements to store your favorite color, your favorite song, and your favorite restaurant in the array elements. I do not want you to use a loop in this logic; use hard-coded index values instead. Print *ALL FOUR* of the values of the array using individual index values. What is stored in the element you did not fill? (type your answer in a single line comment within your program)
  
• Create an array that will hold 5 string values. Use a for loop to prompt the user to enter their 5 favorite movies and store each one in a separate element of the array. Print the values of the array using a For-Each loop.
  
• Create an array to hold 7 doubles. Use any looping structure you want to prompt the user to enter a value and store it in the array. In a separate loop, compute the sum of the values. In a third, separate loop, display the array values in reverse order.
  
• Create an array that will hold 3 integers. Without prompting the user for input or using a loop, fill that array with the values 23, 0, and -5. Write decision logic to determine whether the values in each array element is negative, positive, or equal to zero. Make the decision logic loop 3 times, since we want to test 3 different values.

Answer 1

// Java program to perform operations on array

public class ArrayManip

{

public static void main(String[] args) {

      

             Scanner scan = new Scanner(System.in);

            

             String strValues[] = new String[4];

             strValues[0] = "Color1";

             strValues[1] = "Song1";

             strValues[2] = "Restaurant1";

             System.out.println("String values in the array : ");

             System.out.println(strValues[0]);

             System.out.println(strValues[1]);

             System.out.println(strValues[2]);

             System.out.println(strValues[3]); // The element that is not filled contains null

             System.out.println();

             // Create an array that will hold 5 string values.

             String movies[] = new String[5];

             // for loop to prompt the user to enter and store their 5 favorite movies

             for(int i=0;i<movies.length;i++)

             {

                    System.out.print("Enter movie-"+(i+1)+" : ");

                    movies[i] = scan.nextLine();

             }

            

             System.out.println("For each loop to print the movies : ");

             // Print the values of the array using a For-Each loop.

             for(String s: movies)

             {

                    System.out.println(s);

             }

             System.out.println();

             // Create an array to hold 7 doubles.

             double dblValues[] = new double[7];

            

             // loop to prompt the user to enter a value and store it in the array

             for(int i=0;i<dblValues.length;i++)

             {

                    System.out.print("Enter double value-"+(i+1)+" : ");

                    dblValues[i] = scan.nextDouble();

             }

            

             // In a separate loop, compute the sum of the values.

             double sum = 0;

             for(int i=0;i<dblValues.length;i++)

             {

                    sum += dblValues[i];

             }

             System.out.println("Sum of elements : "+sum); // print the sum of the values

            

             System.out.println("Elements in reverse order : ");

             //In a third, separate loop, display the array values in reverse order.

             for(int i=dblValues.length-1;i>=0;i--)

             {

                    System.out.print(dblValues[i]+" ");

             }

             System.out.println("\n");

             int intValues[] = {23,0,-5}; // Create an array that will hold 3 integers with the values 23, 0, and -5

            

             // loop to print if the values are positive, negative or zero

             for(int i=0;i<intValues.length;i++)

             {

                    if(intValues[i] < 0)

                           System.out.println(intValues[i]+" is negative");

                    else if(intValues[i] > 0)

                           System.out.println(intValues[i]+" is positive");

                    else

                           System.out.println(intValues[i]+" is zero");

             }

        }

}

//end of program

Output:

The element in the String array which was not filled stores null.