Define a method for each array processing (e.g. arraySum, arrayMax, and etc.) in

Question

Define a method for each array processing (e.g. arraySum, arrayMax, and etc.) in the starter file ArrayProcessing.java. Replace the code in the main method (from 7 to 13, except for 10) into method invocations.

public class ArrayProcessing {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
System.out.print("Enter the size of the array to be created: ");
int size = input.nextInt();

//(1) Question to ponder: Can you create an array that can store data of several different data types?
//Answer: No.

//(2) Create an int array (name it myList) that has the size the user just entered.
int[] myList = new int[size];

//(3) Question to ponder: Once an array is created, can its size be changed?
//Answer: No.
  
//(4) Fix the error below
myList[0] = 5;
  
//(5) Replace 0 below with the first array element
System.out.println("The first array element is " + myList[0]);
  
//(6) Fix the error below
System.out.println("The last array element is " + myList[size-1]);
System.out.println("The last array element is " + myList[myList.length-1]);
  
//(7) Write a loop to get user enter values that will be stored in the array
System.out.print("Enter " + myList.length + " values: ");
for (int i = 0; i < myList.length; i++)
myList[i] = input.nextInt();

//(8) Write a loop to print all the values stored in the array
for (int i = 0; i < myList.length; i++)
System.out.print(myList[i] + " ");
System.out.println();
  
//(9) Write a loop to calculate the sum of all array elements.
// Then print the sum after the loop
int total = 0;   
for (int i = 0; i < myList.length; i++) {
total += myList[i];
}
System.out.println("total = " + total);
  
//(10) Calculate and print the average of all the array elements
double average = (double) total/myList.length;
System.out.println("average = " + average);

//(11) Write a loop before to calculate the maximum value among all array elements.
// Then print the maximum after the loop
int max = myList[0];
for (int i = 1; i < myList.length; i++) {
if (myList[i] > max)
max = myList[i];
}
System.out.println("max = " + max);

//(12) Write a loop before to calculate the minimum value among all array elements.
// Then print the minimum after the loop
int min = myList[0];
for (int i = 1; i < myList.length; i++) {
if (myList[i] < min)
min = myList[i];
}
System.out.println("min = " + min);

//(13) Write a loop to left shift the array
int temp = myList[0];
for (int i=0; i <= myList.length - 2; i++)
myList[i] = myList[i+1];
myList[myList.length-1] = temp;

System.out.println("After left shift: ");
  
//(14) Print the array again
for (int i = 0; i < myList.length; i++)
System.out.print(myList[i] + " ");
System.out.println();
  
} //end of main
} //end of class ArrayProcessing

Explanation / Answer

ArrayProcessing .java

import java.util.Scanner;

public class ArrayProcessing {
   public static void main(String[] args) {
       Scanner input = new java.util.Scanner(System.in);
       System.out.print("Enter the size of the array to be created: ");
       int size = input.nextInt();

       // (1) Question to ponder: Can you create an array that can store data of
       // several different data types?
       // Answer: No.

       // (2) Create an int array (name it myList) that has the size the user just
       // entered.
       int[] myList = new int[size];

       // (3) Question to ponder: Once an array is created, can its size be changed?
       // Answer: No.

       // (4) Fix the error below
       myList[0] = 5;

       // (5) Replace 0 below with the first array element
       System.out.println("The first array element is " + myList[0]);

       // (6) Fix the error below
       System.out.println("The last array element is " + myList[size - 1]);
       System.out.println("The last array element is " + myList[myList.length - 1]);

       // 7
       fillArray(myList, input);

//8       // Print Array
       printArray(myList);
//9
       double sum = arraySum(myList);

       System.out.println("total = " + sum);

       // (10) Calculate and print the average of all the array elements
       double average = (double) sum / myList.length;
       System.out.println("average = " + average);
//11
       int max = findMax(myList);
       System.out.println("max = " + max);
//12
       int min = findMin(myList);

       System.out.println("min = " + min);
//13
       leftShift(myList);

       System.out.println("After left shift: ");

       // (14) Print the array again
       for (int i = 0; i < myList.length; i++)
           System.out.print(myList[i] + " ");
       System.out.println();

   } // end of main

   private static void leftShift(int[] myList) {
       int temp = myList[0];
       for (int i = 0; i <= myList.length - 2; i++)
           myList[i] = myList[i + 1];
       myList[myList.length - 1] = temp;

   }

   // Find minimum
   private static int findMin(int[] myList) {
       int min = myList[0];
       for (int i = 1; i < myList.length; i++) {
           if (myList[i] < min)
               min = myList[i];
       }
       return min;
   }

   // Method to calculate Max
   private static int findMax(int[] myList) {
       int max = myList[0];
       for (int i = 1; i < myList.length; i++) {
           if (myList[i] > max)
               max = myList[i];
       }
       return max;
   }

   // Calculate Sum
   private static double arraySum(int[] myList) {
       // (9) Write a loop to calculate the sum of all array elements.
       // Then print the sum after the loop
       int total = 0;
       for (int i = 0; i < myList.length; i++) {
           total += myList[i];
       }
       return total;
   }

   // This method will be used to print the array elements
   private static void printArray(int[] myList) {
       // (8) Write a loop to print all the values stored in the array
       for (int i = 0; i < myList.length; i++)
           System.out.print(myList[i] + " ");
       System.out.println();

   }

   private static void fillArray(int[] myList, Scanner input) {
       // (7) Write a loop to get user enter values that will be stored in the array
       System.out.print("Enter " + myList.length + " values: ");
       for (int i = 0; i < myList.length; i++)
           myList[i] = input.nextInt();

   }
} // end of class ArrayProcessing

Output:

Enter the size of the array to be created: 5
The first array element is 5
The last array element is 0
The last array element is 0
Enter 5 values: 40
25
41
20
10
40 25 41 20 10
total = 136.0
average = 27.2
max = 41
min = 10
After left shift:
25 41 20 10 40

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