Java Array Sorting, Traversal, And Exception Handling

Javaarray Sorting Traversal And Exception Handlingcreate A Menu Drive

Create a menu-driven program that will accept a collection of non-negative integers from the keyboard, calculate the mean and median values and display those values on the screen. Your menu should have 6 options: 1. Add a number to the array 2. Display the mean 3. Display the median 4. Print the array to the screen 5. Print the array in reverse order 6. Quit. Use an array of type int to store the integers entered by the user. Implement error checking on the input; if it is negative, display an error and re-prompt, continuing until a non-negative integer is entered. Incorporate try-catch structures to trap input errors (like letters when numbers are expected) and range errors (such as entering -1). Write your own selectionSort utility method to sort your array, to be placed in an external file named SortSearchUtil.java. Include error checking for menu choices; invalid choices should trigger an error message, re-displaying the menu and prompting again. The program should be modular, following principles of high cohesion and loose coupling, with clear documentation and explanatory comments. Ensure the array is sorted before calculating the median.

Paper For Above instruction

Java Array Sorting, Traversal, and Exception Handling: Menu-Driven Program

This paper presents a comprehensive implementation of a menu-driven Java program designed to manage a collection of non-negative integers using robust error handling, sorting, and data analysis functionalities. The program facilitates user interaction through a menu interface, allowing for dynamic array management, computation of statistical measures such as mean and median, and various forms of data display, all while emphasizing modular design principles, effective exception handling, and code documentation.

Introduction

Managing collections of data in Java often requires creating programs that are interactive, error-resistant, and modular. The primary objectives of the proposed program are to allow users to input non-negative integers safely, perform statistical calculations, sort data efficiently, and display arrays in different formats—all within a user-friendly menu structure. The implementation emphasizes coding best practices, including modularization, exception handling, and adherence to principles ensuring high cohesion and loose coupling.

Design and Implementation

Data Storage and User Input

The program utilizes an integer array to store user-inputted non-negative integers. Given the dynamic nature of user input, an ArrayList would be preferable; however, to meet assignment specifications, a fixed-size array is used with careful management of the current number of elements. Error checking ensures that only non-negative integers are stored, with invalid inputs prompting appropriate error messages. The use of try-catch blocks captures input errors such as invalid data types, while input validation checks for negative values.

Menu and Input Validation

The menu displays six options for manipulating and analyzing the data collection. User choices are captured via Scanner input, with exception handling in place to trap invalid entries (e.g., letters instead of numbers). If an invalid menu option is entered, an error message is issued, and the menu redisplayed until a valid selection is made. This robust input validation upholds user interaction quality and program stability.

Sorting and Statistical Calculations

A custom sorting method, selectionSort, is implemented in an external class file SortSearchUtil.java. This method sorts the array in ascending order, essential for accurate median calculation. The mean is computed by summing all non-negative integers and dividing by the count of elements, while the median involves sorting the array and selecting the middle element(s). Special cases where the array has an even number of elements require averaging the two middle elements.

Array Display and Traversal

The program can print the array in its current order and in reverse. The reverse display is achieved through simple traversal from the last element to the first. These features facilitate data visualization and verify data management functions. The design ensures separation of concerns, with specific methods handling display functions independently.

Error Handling

Input errors—such as entering non-integer characters or out-of-range values—are managed using try-catch blocks, prompting users to re-enter valid data. Negative integers are rejected with an error message, prompting for re-entry. This comprehensive error handling enhances program robustness and user experience.

Modular Design

The program adopts a modular design paradigm by segregating functionalities into distinct methods. All data manipulation, display, and statistical calculations are encapsulated in separate methods, facilitating maintainability, readability, and reusability. The sorting utility resides in an external class, reinforcing separation of concerns and promoting code reuse. Comments and documentation within the code elucidate the purpose and logic of each method.

Conclusion

This implementation showcases best practices in Java programming, including robust error handling, modularity, efficient data processing, and user-centric interaction. By following design principles of high cohesion and loose coupling, the program ensures clarity, flexibility, and scalability. Such a structured approach is beneficial in developing reliable and maintainable software for data management tasks.

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