Java簡單管理系統的實現

文件 FruitItem.java FruitStore.java

FruitItem.java代碼

//自定義類
public class FruitItem {
    int     ID;            //商品編號
    String     name;        //名稱
    double     price;        //單價
}

FruitStore.java代碼

import java.util.ArrayList;
import java.util.Scanner;

/*
 * 超市管理系統
 * 實現 : 
 *         1.商品數據初始化
 *         2.菜單
 *         3.選擇功能
 *         4.增刪改查
 */
public class FruitStore {
    public static void main(String[] args) {
        
        //集合
        ArrayList<FruitItem> array = new ArrayList<FruitItem>();
        
        //商品數據初始化
        init(array);
        
        while (true) {
            //菜單選擇
            mainMenu();
            
            //選擇功能
            int choose = chooseFunction();
            
            switch (choose) {
            case 1:
                //查
                showFruitList(array);
                break;
            case 2:
                //增
                addFruitItem(array);
                break;
            case 3:
                delFruitItem(array);
                break;
            case 4:
                updateFruitItem(array);
                break;
            case 5:
                System.out.println("退出系統");
                return;
            default:
                System.out.println("沒有選擇的功能");
                break;
            }
        }
        
    }
    
    //初始化
    public static void init(ArrayList<FruitItem> array) {
        FruitItem item1 = new FruitItem();
        item1.ID = 101;
        item1.name = "蘋果";
        item1.price = 5.5;
        
        FruitItem item2 = new FruitItem();
        item2.ID = 102;
        item2.name = "菠蘿";
        item2.price = 3.5;
        
        FruitItem item3 = new FruitItem();
        item3.ID = 103;
        item3.name = "甘蔗";
        item3.price = 1.5;
        
        array.add(item1);
        array.add(item2);
        array.add(item3);
        
    }
    
    public static void mainMenu() {
        System.out.println("=========================歡迎光臨水果超市=========================");
        System.out.println("1:查詢貨物 2:添加新貨物 3:刪除貨物 4:修改貨物 5:退出系統");
        System.out.println("請您輸入要操作的功能序號:");
    }
    
    //菜單
    public static int chooseFunction() {
        Scanner sc = new Scanner(System.in);
        return sc.nextInt();
    }
    
    //查詢
    public static void showFruitList(ArrayList<FruitItem> array) {
        System.out.println("=======================商品庫存清單=======================");
        System.out.println("商品編號\t商品名稱\t商品單價");
        for (int i = 0; i < array.size(); i++) {
            FruitItem item = array.get(i);
            System.out.println(item.ID+"\t"+item.name+"\t"+item.price);
        }
    }
    
    //添加
    public static void addFruitItem(ArrayList<FruitItem> array) {
        FruitItem newItem = new FruitItem();
        Scanner sc = new Scanner(System.in);
        
        System.out.println("請輸入ID");
        newItem.ID = sc.nextInt();
        System.out.println("請輸入名稱");
        newItem.name = sc.next();
        System.out.println("輸入商品的單價");
        newItem.price = sc.nextDouble();
        
        array.add(newItem);
        System.out.println("添加成功");
    }
    
    //刪除
    public static void delFruitItem(ArrayList<FruitItem> array) {
        System.out.println("輸入刪除ID");
        Scanner sc = new Scanner(System.in);
        int ID = sc.nextInt();
        
        for (int i = 0; i < array.size(); i++) {
            if (array.get(i).ID == ID) {
                array.remove(array.get(i));
                System.out.println("刪除成功");
                return;
            }
        }
        
        System.out.println("ID 不存在");
    }
    
    //修改
    public static void updateFruitItem(ArrayList<FruitItem> array) {
        System.out.println("輸入ID");
        Scanner sc = new Scanner(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("請輸入ID");
                item.ID = sc.nextInt();
                System.out.println("請輸入名稱");
                item.name = sc.next();
                System.out.println("輸入商品的單價");
                item.price = sc.nextDouble();
                System.out.println("修改成功");
                return;
            }
        }
    }

}