Question

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

1.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?

2.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.

3.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. Also display the sum.

4.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

Hi, Please find my implementation.

import java.util.Scanner;

public class ArrayOperation {

   public static void main(String[] args) {

       //1.

       String[] strArray = new String[4];

       strArray[0] = "Yellow"; // favorite color

       strArray[1] = "Wakka Wakka"; // song

       strArray[2] = "Pettu"; //resturant

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

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

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

       System.out.println(strArray[3]);

       System.out.println();

       // null is stored at 3rd location

       //2.

       // to take user input

       Scanner sc = new Scanner(System.in);

       // creating array

       String[] strArr = new String[5];

       // taking user input

       for(int i=0; i<5; i++){

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

           strArr[i] = sc.nextLine();

       }

       // printing

       for(int i=0; i<5; i++){

           System.out.println(strArr[i]);

       }

       System.out.println();

      

       //3.

       double[] dArr = new double[7];

       // taking user input

       for(int i=0; i<7; i++){

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

           dArr[i] = sc.nextDouble();

       }

      

       // computing sum

       double sum = 0;

       for(int i=0; i<7; i++){

           sum = sum + dArr[i];

       }

       System.out.println("Sum: "+sum);

      

       for(int i=6; i>=0; i--){

           System.out.println(dArr[i]);

       }

       System.out.println();

      

       //4.

       int[] iArr = new int[3];

       for(int i=0; i<3; i++){

           if(i==0)

               iArr[i] = 23;

           else if(i == 1)

               iArr[i] = 0;

           else

               iArr[i] = -5;  

       }

      

       for(int i=0; i<3; i++){

           if(iArr[i] > 0)

               System.out.println("Value at "+(i+1)+"th index is positive");

           else if(iArr[i] <0)

               System.out.println("Value at "+(i+1)+"th index is negative");

           else

               System.out.println("Value at "+(i+1)+"th index is zero");

       }

      

   }

}

/*

Sample run:

Yellow

Wakka Wakka

Pettu

null

Enter 1 value: pk

Enter 2 value: mk

Enter 3 value: vk m

Enter 4 value: rk

Enter 5 value: nk

pk

mk

vk m

rk

nk

Enter 1 double value: 3

Enter 2 double value: 2.3

Enter 3 double value: 8.9

Enter 4 double value: 6

Enter 5 double value: 7.8

Enter 6 double value: 9.0

Enter 7 double value: 1.2

Sum: 38.2

1.2

9.0

7.8

6.0

8.9

2.3

3.0

Value at 1th index is positive

Value at 2th index is zero

Value at 3th index is negative

*/