SelectionMethod.java

import java.util.*;
import java.io.*;
public class SelectionMethod{
	static Scanner input = new Scanner(System.in);
	static int option;
	static java.util.Date date=new java.util.Date();
	static String name;
	public static void chooseMethod(String regNumber) throws Exception{
		int amount = 2000;
		FoodSelection foodSelectionObj = new FoodSelection();//Create an object to acces class FoodSelection 
		DrinkSelection drinkobj = new DrinkSelection();//Create an object to acces class DrinkSelection 
		while(true){
			System.out.println("1.Food\n2.Drinks\n3.bill Generate\n4. Previous Menu.\n5.Exit\n");
			try {
				System.out.print("Enter Your Choice: ");
				option = input.nextInt();
				System.out.println();
				if(option == 1){
					foodSelectionObj.food(regNumber);//Method from class FoodSelection is called here .
					System.out.println("********************************************");
					// break;
				}
				else if(option == 2){
					drinkobj.myDrink(regNumber);//Method from class DrinkSelection is called here .
					System.out.println("********************************************");	
					// break;
				}
				else if(option == 3){
					File file = new File("students_data/"+ regNumber +".txt");
					try{
						Scanner sc = new Scanner(file);
						String[] line = sc.nextLine().split(":");
						name = line[1];
					}
					catch(Exception e){
						System.out.print("Error occured!");
					}

					MyFastFood fastfoodobject = new MyFastFood();//Create an object to call methods from class MyFastFood
					int num = fastfoodobject.FastfoodBill();//method FastfoodBill is caled and its value is stored in num variable

					MyDesiFood desifoodobject = new MyDesiFood();//Create an object to call methods from class MyDesiFood
					int num2 = desifoodobject.DesifoodBill();//method DesifoodBill is caled and its value is stored in num2 variable

					MySoftDrinks softDrinkobject = new MySoftDrinks();//Create an object to call methods from class MySoftDrinks
					int num3 = softDrinkobject.SoftDrinkbill();//method SoftDrinkbill is caled and its value is stored in num3 variable

					MyCoffee coffeeobject = new MyCoffee();//Create an object to call methods from class MyCoffee
					int num4 =coffeeobject.CoffeeBill();//method CoffeeBill is caled and its value is stored in num4 variable

					MyJuiceOrPlantDrink juiceOrPlantDrinkobject = new MyJuiceOrPlantDrink();//Create an object to call methods from class MyJuiceOrPlantDrink
					int num5 = juiceOrPlantDrinkobject.JuiceORPlantbill();//method JuiceORPlantbill is caled and its value is stored in num5 variable
					int TotalAmount= num+num2+num3+num4+num5;
					if(amount>=TotalAmount&& TotalAmount !=0){// check the amount in student account is enough to pay Total amount.
						System.out.println("\n\n\n");
						System.out.println("\t\t\t-----------------------------------");
						System.out.println("\t\t\tDate: "+date);
						System.out.println("\t\t\tName: "+name);
						System.out.println("\t\t\tStudent ID: "+regNumber);
						System.out.println("\t\t\t---------Thanks For Coming---------");
						System.out.println("\t\t\t-----------Your Bill Is------------\n");
						File file2 = new File("cafe/CafeBills/BillFastfood.txt");
						Scanner myReader = new Scanner(file2);
						int count = 0;//to create size of array
						while(myReader.hasNextLine()) {
							myReader.nextLine();
							count+=1;
						}
						Scanner reader = new Scanner(file2);
						String[] array = new String[count];
						int index = 0;
						//Read the data in file as well as input the data in the String Array.
						while (reader.hasNextLine()){
							array[index] = reader.nextLine();//read data from file.
							index++;
						}
						System.out.println("\t\t\tItems           Quantity   Prices\n");
						for (int i = 0 ;i<array.length ;i++ ) {
							System.out.print("\t\t\t"+array[i]+"\n");
						}
						System.out.printf("\t\t\tTotal Bill                  %d  \n",(num+num2+num3+num4+num5));//Total Bill is formed here.
						System.out.println("\t\t\t---------------------------------------");
						System.out.println("\t\t\t---------------------------------------");
						System.out.println("\t\t\t---------------------------------------");
						System.out.println();
						try{
							File file1 = new File("cafe/CafeBills/FinalBills/"+ regNumber +".txt");
							boolean value = file1.createNewFile();
							FileWriter billObj = new FileWriter(file1,true);
							billObj.write("Date: "+date+"\n");
							billObj.write("-----------------------------------\n");
							billObj.write("Name : "+ name +"\n");
							billObj.write("Student ID : "+ regNumber +"\n");
							billObj.write("-----------------------------------\n");
							billObj.write("---------Thanks For Coming---------\n");
							billObj.write("-----------Your Bill Is------------\n");
							billObj.write("\t\t\tItems            Quantity   Prices\n");
							for (int i = 0 ;i<array.length ;i++ ) {
								billObj.write(""+array[i]+"\n");//Write the data
							}
							billObj.write("Total Bill                 "+TotalAmount+"\n");
							billObj.write("-----------------------------------\n");
							billObj.write("-----------------------------------\n\n\n");
							billObj.close();
						
						}
						catch(Exception e){
							System.out.println("invalid");
						}
					}
					else{
						if (TotalAmount==0) {
							System.out.println("Please Buy Something First");
							// break;
							// return amount;
						}
						
						else if(TotalAmount!=0){
							System.out.println("Sir, You don't have enough Account Balance");
						}
					}
				}
				else if(option == 4){
					File file3 = new File("cafe/CafeBills/BillFastfood.txt");

					PrintWriter writer = new PrintWriter(file3);
					writer.print("");
					writer.close();
					CafeManagement.manage(regNumber);
				}

				else if(option ==5){//If user does not want to buy anything
					System.out.println("********************************************");
					File file2 = new File("cafe/CafeBills/BillFastfood.txt");

					PrintWriter writer = new PrintWriter(file2);
					writer.print("");
					writer.close();
					System.exit(0);

				}
				else{
					System.out.println("Please select correct option ");
				}
			} catch(Exception e){
				System.out.println("Invalid Inputs");
				input.nextLine();
				continue;
			}
		}
	}
}