Introduction: Sometimes computer programs need to lump data together! The purpose of this program is to help you gain familiarity of using arrays and loops.

Objectives: Create a NumberList class that will do the following:

Modify a version of NumberList Program that I have given below

Write a program that prompts the user for the size of the array to be manipulated.

Load this array with random integers between -9 and 9 inclusive.

Write a method called evenArray that will take your random array as a parameter and print out the even numbers of that array. The original array is not changed. Consider using a call to the printArray method inside of this method to promote code reuse.

Write a method called oddArray that will take your random array as a parameter and print out the odd numbers of that array. The original array is not changed.

Write a method called negativeArray that will take your random array as a parameter and print out the negative numbers of the array. The original array is not changed.

Write a method called findSum that will take your random array as a parameter and print out the sum of the elements of the array. The original array is not changed.

Write a method called reverseArray that will take your random array as a parameter and print out the elements in reverse order (the first becomes last, the second becomes second to last, etc). The original array is not changed.

Write a method called findMin that will take your random array as a parameter and print out the minimum element of the array. The original array is not changed.

Write a method called findMax that will take your random array as a parameter and print out the maximum element of the array. The original array is not changed.

Write a method called arrayAverage that will take your random array as a parameter and display the average of the numbers in the original array. The original array is not changed.

Extra credit:

HINT: Some of these are very challenging.

Read the description and write out a list of numbers and try to figure out how you would solve this problem, what do you need to keep track of, and when/why would you might use parallel arrays

(+1/2) Write a method called arrayMedian that that will take your random array as a parameter and display the median of the numbers in the original array. You will have to order the elements first. The original array is not changed.

(+1/2) Write a method called arrayMode that will take your random array as a parameter and display the mode of the numbers in the original array. If there are multiple modes, display them all. The original array is not changed.

Note:

• Read all the comments in the shell carefully! They include hints.
• The main method has the tests in it, you just uncomment each method in the main method when you have created the actual methods.
• I have a programming shell completed, you just write in the missing pieces.
• See below what the program should output to the terminal window when run.

Terminal Window Output:

• When run, the program will look like this (user input in bold italics):

Trial 1:

Enter positive integer for size of array to build: 14

The array is loaded with the following random numbers:

2 0 -5 -2 -4 -6 -9 9 3 5 -2 3 9 9

The even numbers of the first array are:

2 0 -2 -4 -6 -2

The odd numbers of the first array are:

-5 -9 9 3 5 3 9 9

The negative numbers of the first array are:

-5 -2 -4 -6 -9 -2

The sum of the elements of the array is:

12

The array with elements reversed is:

9 9 3 -2 5 3 9 -9 -6 -4 -2 -5 0 2

The minimum element of the array is:

-9

The maximum element of the array is:

9

The average of the array is:

0.85714286

Trial 2:

Enter positive integer for size of array to build: 7

The array is loaded with the following random numbers:

-5 -7 -2 -2 4 -4 -6

The even numbers of the first array are:

-2 -2 4 -4 -6

The odd numbers of the first array are:

-5 -7

The negative numbers of the first array are:

-5 -7 -2 -2 -4 -6

The sum of the elements of the array is:

-22

The array with elements reversed is:

-6 -4 4 -2 -2 -7 -5

The minimum element of the array is:

-7

The maximum element of the array is:

4

The average of the array is:

-2.85714

Rubric:

• 2 points: Does it compile successfully?
• 2 points: Does it have good naming conventions (descriptive variable and method names)?
• 2 points: Is it readable (white space and indentations)?
• 2 points: Does it include comments to help aid? Correct heading with author and date?
• 2 points: Was it on time
• 10 points: Does it do what it is supposed to?
• 20 points: Total

NumberList Student Shell

/**

* YOUR NAME HERE

* DATE

* APCS period #

* NumberList

*/

//This program creates and manipulates an array of

//randomly generated numbers in various ways

import java.util.Scanner;

public class NumberList

{

public static void main(String[] args)

{

//creates a call to the getSizeOfArray() method, which is correctly implemented in a method down below

int arraySize = getSizeOfArray();

//You must declare and instantiate an array called myArray

//using the arraySize variable

//You will create methods with the names below

//loadArray(); //This method call needs myArray created above as a parameter

System.out.print(" The array is loaded with the following random numbers: ");

//printArray(); //This method call needs myArray created above as a parameter

System.out.print(" The even numbers in the array are: ");

//evenArray(myArray); //Displays the elements of myArray that contain even numbers

System.out.print(" The odd numbers in the array are: ");

//oddArray(myArray); //Displays the elements of myArray that contain odd numbers

System.out.print(" The negative numbers in the array are: ");

//negativeArray(myArray); //Displays the elements of myArray that contain negative numbers

//other methods go here

}

//Loads an array passed in as a parameter following the

//guidelines in the assignment objectives

//Finish the header for the method (it is not correct)

//Write the code following the guidelines in the assignment objectives

public static void loadArray() //method header not correct

{

//Load your array with random numbers

}

//Displays on one line the elements of the array to the terminal window

//Then moves cursor to next line

public static void printArray(int[] a)

{

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

{

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

}

}

//Gets the size of the array from the user.

//I suggest testing between 15-30, so that the entire array is

//seen when printed to the terminal window.

public static int getSizeOfArray()

{

Scanner reader = new Scanner(System.in);

while (true)

{

System.out.print("Enter positive integer for size of array to build: ");

int size = reader.nextInt();

if (size > 0)

return size;

}

}

//Create a method below that loops through the array

//being passed in as a parameter and prints on one line

//all the elements that contain *even* numbers

//Finish the method header below and write code

public static //finish method header

{

}

//Create a method below that loops through the array

//being passed in as a parameter and prints on one line

//all the elements that contain *odd* numbers

//Finish the method header below and write code

public static //finish method header

{

// write code here

}

//Create a method below that loops through the array

//being passed in as a parameter and prints on one line

//all the elements that contain *negative* numbers

//Finish the method header below and write code

public static //finish method header

{

// write code here

}

//Extras can go below

//Here is what you might use for reverseList example

public static void reverseArray(int[] a)

{

// write code here

}

}