Java Learning Note 7 (an example of a simple supermarket inventory management system)

Using the previously learned knowledge, you can simply do a supermarket inventory management system:

Define a commodity class:

 Public class Fruititem {    int  ID;    String name;     Double Price ;     int Number ;     Double Money ;}

And then:

Importjava.util.ArrayList;ImportJava.util.Scanner; Public classShop { Public Static voidMain (string[] args) {ArrayList<FruitItem> array =NewArraylist<fruititem>();        Init (array);  while(true) {mainMenu (); intChoose =choosefunction (); Switch(choose) { Case1: Showfruitlist (array);  Break;  Case2: Addfruit (array);  Break;  Case3: Deletefruit (array);  Break;  Case4: Updatefruit (array);  Break;  Case5:                return; default: System.out.println ("The number entered does not exist");  Break; }        }    }     Public Static voidUpdatefruit (arraylist<fruititem>Array) {System.out.println ("You have chosen to modify the function"); System.out.println ("Please enter the product number:"); Scanner SC=NewScanner (system.in); intID =Sc.nextint ();  for(inti = 0; I < array.size (); i++) {Fruititem Item=Array.get (i); if(item.id==ID) {System.out.println ("Please enter a new product number:"); Item.id=Sc.nextint (); System.out.println ("Please enter a new product name:"); Item.name=Sc.next (); System.out.println ("Please enter a new product price:"); Item.price=sc.nextdouble (); System.out.println ("Product Modification Successful"); return; }} System.out.println ("The number you entered does not exist"); }         Public Static voidDeletefruit (arraylist<fruititem>Array) {System.out.println ("You have selected the Delete feature"); System.out.println ("Please enter the product number:"); Scanner SC=NewScanner (system.in); intID =Sc.nextint ();  for(inti = 0; I < array.size (); i++) {Fruititem Item=Array.get (i); if(Item.id = =ID)                {Array.remove (i); System.out.println ("Delete Succeeded"); return; }} System.out.println ("The number you entered does not exist"); }         Public Static voidAddfruit (arraylist<fruititem>Array) {System.out.println ("You have chosen to add product Features"); Scanner SC=NewScanner (system.in); System.out.println ("Please enter the product number:"); intID =Sc.nextint (); System.out.println ("Please enter the name of the product:"); String name=Sc.next (); System.out.println ("Please enter the price of the product:"); DoublePrice =sc.nextdouble (); Fruititem Item=NewFruititem (); Item.id=ID; Item.name=name; Item.price=Price ;    Array.add (item); }     Public Static voidShowfruitlist (arraylist<fruititem>Array)        {System.out.println (); System.out.println ("========== Commodity inventory List =========="); System.out.println ("Product Code product name Commodity price");  for(inti = 0; I < array.size (); i++) {Fruititem Item=Array.get (i); System.out.println (Item.id+ "" + item.name + "+" +Item.price); }    }     Public Static voidInit (arraylist<fruititem>Array) {Fruititem F1=NewFruititem (); F1.id= 9527; F1.name= "Banana"; F1.price= 3.0; Fruititem F2=NewFruititem (); F2.id= 9008; F2.name= "Apple"; F2.price= 5.6; Fruititem f3=NewFruititem (); F3.id= 9879; F3.name= "Orange"; F3.price= 6.6;        Array.add (F1);        Array.add (F2);    Array.add (F3); }     Public Static voidMainMenu () {System.out.println (); System.out.println ("========== Welcome to XXX supermarket =========="); System.out.println ("1: Cargo List 2: Add goods 3: Delete Goods 4: Modify goods 5: Exit"); System.out.println ("Please enter the function number you want to operate."); }     Public Static intchoosefunction () {Scanner SC=NewScanner (system.in); returnSc.nextint (); }}

Java Learning Note 7 (an example of a simple supermarket inventory management system)