Project case — Foodie Alliance

I. Project Preparation:

1. Development Environment:

• JDK1.8
• IntelliJ IDEA

2. Technical Analysis:

• Can understand the basic concept of program – program
• Use variables, data types
• Can write programs using sequential, select, loop, jump statements
• You can use arrays

3. Task Description:

As long as you move your finger, you can deliver food “, online ordering by modern people, is the development of an online ordering system, the functions are as follows:

• I want to order a meal

• View the meal bags

• To sign for the order

• Delete the order

• I’d like praise

• Log out

Ii. Requirements:

1. Demand analysis:

Buyer:

Buyer order basic information – username, time, address, quantity, etc

The seller:

Dish information – unit price, variety, number of likes

Module division:

Order — add –insert -c (create) View bag — query –read -r Sign order — modify –update -u delete order –delete –delete -d I like — Accessibility exit system — flow control

2. Writing Requirements:

Project name –Foods package name — CN.xx. controll class name –OrderingMsg Project preparation needs to be made into running JAR and BAT files

3. Compilation steps:

Define variables — test data — build frames: do… While nested switch, will jump to switch with a number to replace View order View before — Loop Before check is empty Add order Job: Complete whether to continue function add Note Separate operation of Printing receipts and array add data Sign order: Judge sign case: Delete the order: move all the data after the data to be deleted forward, and then empty the last waste data. I click “Like” : display the menu, and then add 1 to the designated “like” dishes

Iii. Code Analysis:

1. Define variables:

// Define the buyer variable -- array
String[] names=new String[4];            // The name of the person who ordered the meal
int[] times=new int[4];                  // Reservation time - on the hour
String[]  addresses=new String[4];       // Reservation address
String[] dishMegs=new String[4];         // Information about selected dishes
double[] sumPrices=new double[4];        / / total amount
int[] states=new int[4];                 // Order status information
		
// Define the seller's menu variable -- array
String[] dishNames={"Big elbows"."Meat in pot"."Spicy duck head"."Spicy shrimp"};     // Menu information
double[] prices={59.58.48.69};						  // Menu price
int[] praiseNums={4.5};  							  // The number of likes
Copy the code

2. Framework module:

do{
    System.out.println("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *");
    System.out.println(1. I'd like to order a table.);
    System.out.println("Step 2 Check your lunch bag");
    System.out.println("3. Sign for the order");
    System.out.println("4. Delete order");
    System.out.println("5. I like it");
    System.out.println("6. Log out");
    System.out.println("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *");
    System.out.println("Please select");
    num=input.nextInt();
    switch (num) {
        case 1:
            System.out.println("I'd like to order a meal.");
            break;
        case 2:
            System.out.println("Check your lunch bag.");
            break;
        case 3:
            System.out.println("Sign for order");
            break;
        case 4:
            System.out.println("Delete order");
            break;
        case 5:
            System.out.println("I give it a thumbs up.");
            break;
        case 6:
            System.out.println(Log out of the system);
            isExit=true;
            break;
        default:
            isExit=true;
            break;
    }

    // Determine whether to go back to the level 1 menu
    if(! isExit){ System.out.println("Enter 0 and return");
        num=input.nextInt();
    }else{
        break; }}while(num==0);
System.out.println("Welcome next time!");	
Copy the code

Step 3 Check your bag:

for (int i = 0; i <names.length; i++) {
    // Check -- If the user information is empty, the order will not be printed
    if(names[i]! =null){
        String state=(states[i]==0)?"Booked":"Done";
        String  sumPrice=sumPrices[i]+"Yuan";
        String time=times[i]+"When";
        System.out.println((i+1) +" \t\t"+names[i]+" \t\t"
                           +dishMegs[i]+" \t\t"+time
                           +" \t\t"+addresses[i]+" \t\t"+sumPrice+" \t\t"+state); }}Copy the code

4. I’d like to make a reservation.

for (int i = 0; i < names.length; i++) {
    // Add content to array - need to get array empty position - first position - loop end
    if(names[i]==null) {// The entry decision marks a space where data can be added -- to modify the mark
        isAdd=true;
        // Add order
        System.out.println("Please enter user name");  // Simulate login
        String name=input.next();
        // Print menu information
        System.out.println("No. \t Dish name \t unit price \t Number of likes");
        for (int j = 0; j < dishNames.length; j++) {
            String  price=prices[j]+"Yuan";
            String  praise=(praiseNums[j]>0)? praiseNums[j]+"Praise":"";
            System.out.println((j+1) +" \t"+dishNames[j]+" \t"+price+" \t"+praise);
        }
        System.out.println("Please enter the serial number of your choice.");
        int  chooseDish=input.nextInt();
        System.out.println("Please enter the number of shares purchased.");
        int number=input.nextInt();
        // Process order information and order totals
        String dishMeg=dishNames[chooseDish-1] +""+number+"份";
        double sumPrice=prices[chooseDish-1]*number;
        // Determine whether delivery is required: over 50 free delivery
        double deliCharge=(sumPrice>=50)?0:5;    / / shipping fee
        // Delivery time - If the time input is incorrect, repeat the input until the input is correct 10-20
        System.out.println("Please enter the delivery time (on the hour of 10-20)");
        int  time=input.nextInt();
        /*while(! (time>=10&&time<=20)){system.out.println (" you entered an incorrect time, please re-enter "); time=input.nextInt(); } * /
        while(time<10 ||time>20){
            System.out.println("The time you entered is incorrect. Please re-enter it.");
            time=input.nextInt();
        }
        System.out.println("Please enter delivery address");
        String address=input.next();

        // Print the receipt
        System.out.println("Reservation successful!");
        System.out.println("What's your order?"+dishMeg);
        System.out.println("The cost of the meal is."+sumPrice+", the delivery fee is."+deliCharge+"The total amount is."+(sumPrice+deliCharge));

        // Add data to the array
        names[i]=name;
        dishMegs[i]=dishMeg;
        times[i]=time;
        addresses[i]=address;
        sumPrices[i]=sumPrice+deliCharge;
        // The loop ends immediately after adding to the current loop
        break; }}// If no empty seat is found at the end of the loop, the current bag is full
if(! isAdd){ System.out.println("Sorry, the dinner bag is full!");
}
Copy the code

5. Sign and order:

for (int i = 0; i <names.length; i++) {
    // Check -- If the user information is empty, the order will not be printed
    if(names[i]! =null){
        String state=(states[i]==0)?"Booked":"Done";
        String  sumPrice=sumPrices[i]+"Yuan";
        String time=times[i]+"When";
        System.out.println((i+1) +" \t\t"+names[i]+" \t\t"+dishMegs[i]+" \t\t"+time
                           +" \t\t"+addresses[i]+" \t\t"+sumPrice+" \t\t"+state); }}Copy the code

6. Delete order:

for (int i = 0; i < names.length; i++) {
    if(names[i]! =null&&states[i]==1&&delId==i+1) {// The order can be found and deleted
        isDelFind=true;
        // Perform the delete operation, all data after the deleted element is moved in sequence -- subsequent data
        for (int j = delId-1; j < names.length-1; j++) {
            names[j]=names[j+1];
            dishMegs[j]=dishMegs[j+1];
            times[j]=times[j+1];
            addresses[j]=addresses[j+1];
            states[j]=states[j+1];
        }
        // The last data is cleared and restored
        names[names.length-1] =null;
        dishMegs[dishMegs.length-1] =null;
        times[times.length-1] =0;
        addresses[addresses.length-1] =null;
        states[states.length-1] =0;
        System.out.println("Order deleted successfully!");
        break;
    }else if(names[i]! =null&&states[i]==0&&delId==i+1) {// Order can be found but cannot be deleted
        isDelFind=true;
        System.out.println("This order has not been signed and cannot be deleted!");
        break; }}// If the order is not found at the end of the loop, it does not exist
if(! isDelFind){ System.out.println("The order you want to delete does not exist!");
}
Copy the code

7. I like it:

for (int i = 0; i < dishNames.length; i++) {
    String price=prices[i]+"Yuan";
    String praiseNum=(praiseNums[i]>0)? praiseNums[i]+"Praise":"";
    System.out.println((i+1) +"\t "+dishNames[i]+"\t "+price+"\t "+praiseNum);
}
System.out.println("Please enter the number of the food you want to like.");
int praiseId=input.nextInt();
// Increase the number of likes
praiseNums[praiseId-1] + +; System.out.println("Thumbs up!");
Copy the code

Note:

Article for the core code, if you need a complete code, you can talk about me at any time, you can also add the penguin group 720994366 to find management to.