Create a java class called ArrayOperations. Add the static methods described below. Then write a test class to verify that all of your methods work. Static Methods for ArrayOperations The lcass name is ArrayOperations It has one static method called findSum. This method returns the sum of the elements in an array To invoke this method from another class, we use the class name (ArrayOperations.findSum(MyArray)); toString : This method signature should be: public static String toString(int[] anArray). It should return a String that consists of all elements in the array. For example if the input array consists of {1, 5, 9, 2}, then toString should return the string 1 5 9 2 findMaxMin : The signature for this method should be public static int[] findMaxMin(int[] anArray) Notice that the method returns an array of int – not a single value. In this method Write code to declare an array of int with two elements – say limits Find the largest element in the array and store it in limits[0] Find the smallest element in the array and store it in limits[1] return limits findAverage: The signature for this method should be public static double findAverage(int[] myArray) In the implementation, we simply need to compute the sum of the array elements and divide them by the length of the array. We can do this by using findSum and dividing by the array length. The test program ArrayOperationsTest The test class should conform to the following specifications: The name of the class is ArrayOperationsTest The test class should contain a static method called makeArray The test class should contain a static method called menu that offers the user the following choices Make a new array (ask the user for the number of elements) Calculate and print the sum of the array elements Find and print max and min values in the array Print the toString for the array Calculate and print the average value in the array QUIT The program should have a main method that works as follows Display the menu and get user choice Call the appropriate method(s) to do what the user needs and display the results Loop until the user selects QUIT Summary ArrayOperations has static methods findSum, findAverage, findVariance, and findMaxMin. ArrayOperationsTest has methods makeArray, menu, and main. You will need to import Scanner and Random. A sample run might consist of Creating an array with 10 elements Printing the sum of the array elements Printing the max and min values in the array Printing the average value for the array Printing the variance for the array Printing the toString for the array

Create a java class called ArrayOperations. Add the static methods described below. Then write a test class to verify that all of your methods work. Static Methods for ArrayOperations The lcass name is ArrayOperations It has one static method called findSum. This method returns the sum of the elements in an array To invoke this method from another class, we use the class name (ArrayOperations.findSum(MyArray)); toString : This method signature should be: public static String toString(int[] anArray). It should return a String that consists of all elements in the array. For example if the input array consists of {1, 5, 9, 2}, then toString should return the string 1 5 9 2 findMaxMin : The signature for this method should be public static int[] findMaxMin(int[] anArray) Notice that the method returns an array of int – not a single value. In this method Write code to declare an array of int with two elements – say limits Find the largest element in the array and store it in limits[0] Find the smallest element in the array and store it in limits[1] return limits findAverage: The signature for this method should be public static double findAverage(int[] myArray) In the implementation, we simply need to compute the sum of the array elements and divide them by the length of the array. We can do this by using findSum and dividing by the array length. The test program ArrayOperationsTest The test class should conform to the following specifications: The name of the class is ArrayOperationsTest The test class should contain a static method called makeArray The test class should contain a static method called menu that offers the user the following choices Make a new array (ask the user for the number of elements) Calculate and print the sum of the array elements Find and print max and min values in the array Print the toString for the array Calculate and print the average value in the array QUIT The program should have a main method that works as follows Display the menu and get user choice Call the appropriate method(s) to do what the user needs and display the results Loop until the user selects QUIT Summary ArrayOperations has static methods findSum, findAverage, findVariance, and findMaxMin. ArrayOperationsTest has methods makeArray, menu, and main. You will need to import Scanner and Random. A sample run might consist of Creating an array with 10 elements Printing the sum of the array elements Printing the max and min values in the array Printing the average value for the array Printing the variance for the array Printing the toString for the array

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Create a java class called ArrayOperations. Add the static methods described below. Then write a test class to verify that all of your methods work.

Static Methods for ArrayOperations

The lcass name is ArrayOperations
It has one static method called findSum. This method returns the sum of the elements in an array
To invoke this method from another class, we use the class name (ArrayOperations.findSum(MyArray));
toString : This method signature should be: public static String toString(int[] anArray). It should return a String that consists of all elements in the array. For example if the input array consists of {1, 5, 9, 2}, then toString should return the string 1 5 9 2
findMaxMin : The signature for this method should be public static int[] findMaxMin(int[] anArray) Notice that the method returns an array of int – not a single value. In this method
Write code to declare an array of int with two elements – say limits
Find the largest element in the array and store it in limits[0]
Find the smallest element in the array and store it in limits[1]
return limits
findAverage: The signature for this method should be public static double findAverage(int[] myArray)

In the implementation, we simply need to compute the sum of the array elements and divide them by the length of the array. We can do this by using findSum and dividing by the array length.

The test program ArrayOperationsTest

The test class should conform to the following specifications:

The name of the class is ArrayOperationsTest
The test class should contain a static method called makeArray
The test class should contain a static method called menu that offers the user the following choices
Make a new array (ask the user for the number of elements)
Calculate and print the sum of the array elements
Find and print max and min values in the array
Print the toString for the array
Calculate and print the average value in the array
QUIT
The program should have a main method that works as follows
Display the menu and get user choice
Call the appropriate method(s) to do what the user needs and display the results
Loop until the user selects
QUIT

Summary

ArrayOperations has static methods findSum, findAverage, findVariance, and findMaxMin.

ArrayOperationsTest has methods makeArray, menu, and main. You will need to import Scanner and Random.

A sample run might consist of

Creating an array with 10 elements
Printing the sum of the array elements
Printing the max and min values in the array
Printing the average value for the array
Printing the variance for the array
Printing the toString for the array

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