added old projects
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Austin Bennett
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/*
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* Austin Bennett
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* App.java
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* Project 2
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* This has the main method and handles the menu
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*/
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package Project2;
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import java.util.Scanner;
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public class App {
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public static void main(String[] args) throws Exception {
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// initialize the list and the scanner
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ShoppingCart shoppingList = new ShoppingCart();
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Scanner sc = new Scanner(System.in);
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// show the options initially
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shoppingList.PrintOptions();
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// Main loop
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while (true) {
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// Get input from user
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System.out.print("\nWhat would you like to do? (Type 8 to view options again): ");
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String input;
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input = sc.nextLine();
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switch (input) { // switch method to run menu. using strings to prevent issues with user entering
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// possible wrong type
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case "1": // Print Items
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shoppingList.print();
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break;
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case "2": // Add single item
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shoppingList.addItem();
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break;
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case "3": // Add multiple items
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shoppingList.addMultiple();
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break;
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case "4": // remove item
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shoppingList.removeItem();
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break;
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case "5": // sort by name
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shoppingList.sortName();
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break;
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case "6": // sort by cost
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shoppingList.sortCost();
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break;
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case "7": // search the list for item
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shoppingList.search();
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break;
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case "8": // print the options again
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shoppingList.PrintOptions();
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break;
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case "9": // Checkout
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shoppingList.checkout();
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System.exit(0);
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default: // used if user inputs a non valid choice
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System.out.println("Invalid Choice");
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}
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}
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}
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}
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@@ -0,0 +1,18 @@
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/*
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* Austin Bennett
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* Item.java
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* Project 2
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* This provides a class for the items to add to the shopping cart
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*/
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package Project2;
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public class Item { // used to hold the item name and the item cost
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public String _name;
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public Double _cost;
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public Item(String name, double cost) { // constuctor
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_name = name;
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_cost = cost;
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}
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}
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@@ -0,0 +1,24 @@
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/*
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* Austin Bennett
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* LinearSearch.java
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* Project 2
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* This handles searching the list
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*/
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package Project2;
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import java.util.List;
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public class LinearSearch {
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// runs through all elements until it find the one it's looking for
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static public int search(List<Item> list, String input) { // O(n)
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int index = -1;
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for (int i = 0; i < list.size(); i++) {
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if (list.get(i)._name.toLowerCase().equals(input.toLowerCase())) {
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index = i;
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}
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}
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return index;
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}
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}
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@@ -0,0 +1,64 @@
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/*
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* Austin Bennett
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* MergeSort.java
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* Project 2
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* This handles sorting the list
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*/
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package Project2;
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import java.util.*;
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import java.util.ArrayList;
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public class MergeSort {
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public static void sort(List<Item> list, int sortBy) {
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if (list.size() < 2) { // check to make sure that list can be sorted
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return;
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}
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int mid = list.size() / 2; // Getting the midpoint
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List<Item> left = new ArrayList<Item>(list.subList(0, mid)); // left sub list
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List<Item> right = new ArrayList<Item>(list.subList(mid, list.size())); // right sub list
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// recursive sorting for left and right trees until the list size is 1
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sort(left, sortBy);
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sort(right, sortBy);
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merge(left, right, list, sortBy);
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}
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// merges the l and r lists
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private static void merge(
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List<Item> left, List<Item> right, List<Item> list, int sortBy) {
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int lIndex = 0;
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int rIndex = 0;
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int listIndex = 0;
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// sorting
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while (lIndex < left.size() && rIndex < right.size()) {
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// if sortBy is 1 -> sort by name
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if (sortBy == 1) {
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if (left.get(lIndex)._name.compareTo(right.get(rIndex)._name) < 0) {
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list.set(listIndex++, left.get(lIndex++)); // sets the new element
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} else {
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list.set(listIndex++, right.get(rIndex++)); // sets the new element
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}
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}
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// if sortBy is 2 -> sort by cost
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if (sortBy == 2) {
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if (left.get(lIndex)._cost.compareTo(right.get(rIndex)._cost) < 0) {
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list.set(listIndex++, left.get(lIndex++)); // sets the new element
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} else {
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list.set(listIndex++, right.get(rIndex++)); // sets the new element
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}
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}
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}
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while (lIndex < left.size()) {
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list.set(listIndex++, left.get(lIndex++)); // sets the new element
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}
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while (rIndex < right.size()) {
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list.set(listIndex++, right.get(rIndex++)); // sets the new element
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}
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}
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}
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@@ -0,0 +1,144 @@
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/*
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* Austin Bennett
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* ShoppingList.java
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* Project 2
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* This has all the methods for about everything in the project
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*/
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package Project2;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Scanner;
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public class ShoppingCart {
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// initialize the variables and scanner
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List<Item> list = new ArrayList<Item>();
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Scanner sc = new Scanner(System.in);
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// prints all the items in the list exactly how they were ordered
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public void print() { // O(n)
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if (list.size() == 0)
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System.out.println("Add items to cart.");
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for (int i = 0; i < list.size(); i++)
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System.out.println(list.get(i)._name + ": $" + list.get(i)._cost);
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}
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// adds items to the list
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public void addItem() { // O(1) ignoring a user just spmming the wrong input type
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System.out.print("\nEnter Item: ");
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String name = sc.nextLine();
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// getting how much the item costs
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Double cost = 0.0;
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while (true) { // forces user to input a double for price
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System.out.print("Enter Cost ($): ");
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String costInput = sc.nextLine();
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try {
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cost = Double.parseDouble(costInput); // parses input for double
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break;
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} catch (NumberFormatException nfe) {
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}
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}
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// creates new item to add and adds it
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Item newItem = new Item(name, cost);
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list.add(newItem);
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}
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// adds multiple items for convience
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public void addMultiple() { // O(n) ignoring a user just spamming the wrong input type
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int num;
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while (true) { // forces user to input a int for items to add
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System.out.print("Enter number of Items: ");
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String numInput = sc.nextLine();
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try {
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num = Integer.parseInt(numInput); // parses input for int
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break;
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} catch (NumberFormatException nfe) {
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}
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}
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// runs through loop to add items
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for (int i = 0; i < num; i++) {
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addItem();
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}
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}
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public void removeItem() { // O(n) due to the Linear Search
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// gets item to remove
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System.out.print("Enter item to remove: ");
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String item = sc.nextLine();
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int index = LinearSearch.search(list, item); // gets index of item to search for
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if (index != -1) // if item is in list
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list.remove(index);
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else
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System.out.println("Not in shopping list");
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}
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// MergeSort based on name
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public void sortName() { // O(n log n)
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if (list.size() == 0)
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System.out.println("Add items to cart.");
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else {
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MergeSort.sort(list, 1);
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print();
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}
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}
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// MergeSort base on price
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public void sortCost() { // O(n log n)
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if (list.size() == 0)
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System.out.println("Add items to cart.");
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else {
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MergeSort.sort(list, 2);
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print();
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}
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}
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// returns result of the search
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public void search() { // O(n)
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if (list.size() == 0)
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System.out.println("Add items to cart.");
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else {
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System.out.print("Enter item to search for: ");
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String input = sc.nextLine();
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int index = LinearSearch.search(list, input);
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if (index != -1)
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System.out.println("Item is in cart at index " + index);
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else
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System.out.println("Item is not in cart.");
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}
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}
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// prints all the options
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public void PrintOptions() { // O(1)
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System.out.println();
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System.out.println("1. View Shopping Cart");
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System.out.println("2. Add Singular Item");
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System.out.println("3. Add Multiple Items");
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System.out.println("4. Remove Item");
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System.out.println("5. Sort by name");
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System.out.println("6. Sort by cost");
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System.out.println("7. Check if item is in cart");
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System.out.println("8. Show options");
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System.out.println("9. Checkout");
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}
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// totals the cart and prints the result
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public void checkout() { // O(n)
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Double total = 0.0;
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for (int i = 0; i < list.size(); i++)
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total += list.get(i)._cost;
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System.out.println("\nYour total is: $" + total);
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print();
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}
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}
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