Java study note 7 (simple supermarket inventory management system example ),

Java study note 7 (simple supermarket inventory management system example ),

With the previous knowledge, you can simply build a supermarket inventory management system:

Define a product category:

public class FruitItem {    int ID;    String name;    double price;    int number;    double money;}

Then:

Import java. util. arrayList; import java. util. extends; public class Shop {public static void main (String [] args) {ArrayList <FruitItem> array = new ArrayList <FruitItem> (); init (array); while (true) {mainMenu (); int choose = chooseFunction (); switch (choose) {case 1: showFruitList (array); break; case 2: addFruit (array); break; case 3: deleteFruit (array); break; case 4: updateFruit (array); break; case 5: return; default: System. out. println ("the Input Serial number does not exist"); break ;}} public static void updateFruit (ArrayList <FruitItem> array) {System. out. println ("You selected the modify function"); System. out. println ("Enter the product number:"); then SC = new then (System. in); int ID = SC. nextInt (); for (int I = 0; I <array. size (); I ++) {FruitItem item = array. get (I); if (item. ID = ID) {System. out. println ("Enter the new product number:"); item. ID = SC. nextInt (); System. out. println ("Enter the new product name:"); item. name = SC. next (); System. out. println ("Enter the new product price:"); item. price = SC. nextDouble (); System. out. println ("item modified successfully"); return ;}} System. out. println ("the number you entered does not exist");} public static void deleteFruit (ArrayList <FruitItem> array) {System. out. println ("delete function selected"); System. out. println ("Enter the product number:"); then SC = new then (System. in); int ID = SC. nextInt (); for (int I = 0; I <array. size (); I ++) {FruitItem item = array. get (I); if (item. ID = ID) {array. remove (I); System. out. println ("deleted successfully"); return ;}} System. out. println ("the number you entered does not exist");} public static void addFruit (ArrayList <FruitItem> array) {System. out. println ("You selected the add product feature"); optional SC = new feature (System. in); System. out. println ("Enter the product number:"); int ID = SC. nextInt (); System. out. println ("Enter the product name:"); String name = SC. next (); System. out. println ("Enter the unit price of the product:"); double price = SC. nextDouble (); FruitItem item = new FruitItem (); item. ID = ID; item. name = name; item. price = price; array. add (item);} public static void showFruitList (ArrayList <FruitItem> array) {System. out. println (); System. out. println ("=========== commodity inventory list ==========="); System. out. println ("Product ID product name product price"); for (int I = 0; I <array. size (); I ++) {FruitItem item = array. get (I); System. out. println (item. ID + "" + item. name + "" + item. price) ;}} public static void init (ArrayList <FruitItem> array) {FruitItem f1 = new FruitItem (); f1.ID = 9527; f1.name = "banana"; f1.price = 3.0; fruitItem f2 = new FruitItem (); f2.ID = 9008; f2.name = "apple"; f2.price = 5.6; FruitItem f3 = new FruitItem (); f3.ID = 9879; f3.name = "orange "; f3.price = 6.6; array. add (f1); array. add (f2); array. add (f3);} public static void mainMenu () {System. out. println (); System. out. println ("=========== welcome to a certain supermarket =========="); System. out. println ("1: Goods List 2: Add goods 3: delete goods 4: Modify Goods 5: Exit"); System. out. println ("Enter the function serial number you want to operate");} public static int chooseFunction () {feature SC = new feature (System. in); return SC. nextInt ();}}