Java implements a simple meal ordering system

import ;
import .*;
 
public class OrderingMsg {
 
public static void main(String[] args) {
// Data subject: a set of order informationString[] names = new String[4]; // Name of the ordererString[] dishMegs = new String[4]; // Selected dishesint[] times = new int[4]; // Meal delivery timeString[] addresses = new String[4]; // Delivery addressint[] states = new int[4]; // Order status: 0: Reservation 1: Completeddouble[] sumPrices = new double[4]; // lump sum 
//Initialize 2 order informationnames[0] = "Zhang Qing";
dishMegs[0] = "Braised Hairfish 2 servings";
times[0] = 12;
addresses[0] = "No. 207 Tiancheng Road";
sumPrices[0] = 76.0;
states[0] = 1;
 
names[1] = "Zhang Qing";
dishMegs[1] = "2 servings of fish-flavored shredded pork";
times[1] = 18;
addresses[1] = "No. 207 Tiancheng Road";
sumPrices[1] = 20.0;
 
// Dishes to choose fromString[] dishNames = { "Braised Hairfish", "Fish-flavored shredded pork", "Seasonal Fresh Vegetables" }; // Name of the dishdouble[] prices = new double[] { 38.0, 20.0, 10.0 }; // Single price of the menuint[] praiseNums = new int[3];
 
Scanner input = new Scanner();
int num = -1; // The user enters 0 and returns to the main menu, otherwise exit the systemboolean isExit = false; // Sign whether the user exits the system: true: exits the system 
("\nWelcome to use the "Foodie Alliance Food Ordering System"");
// Loop: Display the menu and perform corresponding functions according to the number selected by the userdo {
// Show menu("****************************");
("1. I want to order a meal");
("2. Check the meal bag");
("3. Sign for orders");
("4. Delete the order");
("5. I want to like it");
("6. Exit the system");
("****************************");
("Please select:");
int choose = (); // Record the function number selected by the userboolean isAdd = false; //Record whether you can order a mealboolean isSignFind = false; //Find the order to be signedboolean isDelFind = false; //Find the order to be deleted// Perform the corresponding function according to the function number selected by the userswitch (choose) {
case 1:
// I want to order a meal("***I want to order food***");
("Please enter the name of the orderer:");
String name=();
isAdd=true;
int j = 0;
for (; j < ; j++) { 
        //todo
if(names[j]==null){
 
names[j]=name;
break;
} 
else {
isAdd=true;
}
     }
 
if(!isAdd){
("Sorry, your meal bag is full!");
}
else {
("Serial Number"+"\t"+"Dish Name"+"\t"+"price");
for(int i=0;i<;i++){
(i+1+"\t"+dishNames[i]+"\t"+prices[i]+"\n");
 
}
("Please enter the dish number:");
int dishNum=();
("Please enter the quantity of dishes:");
int dishCnt=();
String dishMeg=dishNames[dishNum-1]+dishCnt+"share";
dishMegs[j]=dishMeg;
("Please enter the delivery address:");
String Addr=();
addresses[j]=Addr;
("Please enter the delivery time:");
int time=();
times[j]=time;
double sumPrice=prices[dishNum-1]*dishCnt;
double deliCharge=(sumPrice>50)?0:5;
("Meal Fee:"+sumPrice+"Yuan, meal delivery fee:"+deliCharge+"Yuan, total:"+(sumPrice+deliCharge)+"Yuan.");
sumPrices[j]=sumPrice+deliCharge;
}
break;
case 2:
// Check out the dining bag("***View Dining Bags***");
("Serial number\tSubscriber\tMeal information\tDate delivery date\tDelivery address\tTotal amount\tOrder status");
 //todo
for(int i=0;names[i]!=null;i++) {
String sta=(states[i]==1)?"Completed":"Reserved";
((i+1)+"\t"+names[i]+"\t"+dishMegs[i]+"\t"+times[i]+"\t"+addresses[i]+"\t"+sumPrices[i]+"\t"+sta+"\n");
 
}
break;
case 3:
// Sign for orders("***Sign orders******");
 
 //todo
("Serial number\tSubscriber\tMeal information\tDate delivery date\tDelivery address\tTotal amount\tOrder status");
for(int i=0;names[i]!=null;i++) {
String sta=(states[i]==1)?"Completed":"Reserved";
((i+1)+"\t"+names[i]+"\t"+dishMegs[i]+"\t"+times[i]+"\t"+addresses[i]+"\t"+sumPrices[i]+"\t"+sta+"\n");
 
}
("Please select the order number to sign for:");
int n=();
states[n-1]=1;
("Serial number\tSubscriber\tMeal information\tDate delivery date\tDelivery address\tTotal amount\tOrder status");
for(int i=0;names[i]!=null;i++) {
String sta=(states[i]==1)?"Completed":"Reserved";
((i+1)+"\t"+names[i]+"\t"+dishMegs[i]+"\t"+times[i]+"\t"+addresses[i]+"\t"+sumPrices[i]+"\t"+sta+"\n");
 
}
break;
case 4:
// Delete the order("***Delete Order***");
("Serial number\tSubscriber\tMeal information\tDate delivery date\tDelivery address\tTotal amount\tOrder status");
for(int i=0;i<4;i++) {
String sta=(states[i]==1)?"Completed":"Reserved";
((i+1)+"\t"+names[i]+"\t"+dishMegs[i]+"\t"+times[i]+"\t"+addresses[i]+"\t"+sumPrices[i]+"\t"+sta+"\n");
 
}
("Please enter the order number to be deleted:");
 //todo
int m=();
for(int k=m; k<4;k++)
{
names[k-1]=names[k];
dishMegs[k-1]=dishMegs[k];
times[k-1]=times[k];
addresses[k-1]=addresses[k];
sumPrices[k-1]=sumPrices[k];
states[k-1]=states[k];
}
("Serial number\tSubscriber\tMeal information\tDate delivery date\tDelivery address\tTotal amount\tOrder status");
for(int i=0;i<4;i++) {
String sta=(states[i]==1)?"Completed":"Reserved";
((i+1)+"\t"+names[i]+"\t"+dishMegs[i]+"\t"+times[i]+"\t"+addresses[i]+"\t"+sumPrices[i]+"\t"+sta+"\n");
 
}
break;
case 5:
// I want to like("***I want to like******");
// Show dish information("Serial Number" + "\t" + "Dish Name"+"\t"+"unit price");
for(int i=0;i<;i++){
(i+1+"\t"+dishNames[i]+"\t"+prices[i]+"\t"+praiseNums[i]+"praise"+"\n");
}
 //todo
("Please enter the like number:");
int number=();
praiseNums[number-1]=praiseNums[number-1]+1;
("Serial Number" + "\t" + "Dish Name"+"\t"+"unit price");
for(int i=0;i<;i++){
(i+1+"\t"+dishNames[i]+"\t"+prices[i]+"\t"+praiseNums[i]+"praise"+"\n");
}
break;
case 6:
// Exit the systemisExit = true;
break;
default:
//Exit the systemisExit = true;
break;
}
if (!isExit) {
("Input 0 returns:");
num = ();
} else {
break;
}
} while (num == 0);
("Thank you for using it, welcome next time!");
}
}