Question

Implement a Lucky Draw game in which the user has to input an integer ‘input’ and multiply it with a random integer to get the product ‘p’. Depending upon the value of ‘p’ display the prize amount. Use a suitable Java Collection object to store the prize amount for each value of ‘p’.

Design a generic stack data structure (not a Collection object) which can handle integer, double, character and any user-defined objects. Write a menu-driven Java program to test it.

Answer 1

CODE

import java.util.Scanner;
 public class Member {
 public static void main(String[] args) {
  // TODO automatic generation method stub
        Scanner input=new Scanner(System.in);
                 String continueChoice="n"; / / define a negative, used to jump out of the program
                 String userNamer=""; / / define a username variable
                 String password="";//Define a password variable
                 Int cardNumber=0000;//Define a four-digit card number
                 Int max=9999; / / maximum random number
                 Int min=1000;//minimum random number
                 Boolean isRegister=false; / / judgment, if it is false, return
                 Boolean isLogin=false; / / judgment, if it is false, return
                 / / The entire program loop, with do while loop, first loop and then judge
        do {
                   //Main menu option
                   System.out.println("*****Welcome to the Award Winner System*****");
             System.out.println(" 1.Register");
             System.out.println(" 2. Login");
             System.out.println(" 3. Draw");
      System.out.println("****************************");
             System.out.println("Please enter options");
      int menChoice=input.nextInt();
             / / Algorithm used in the option
      switch (menChoice) {
   case 1:
         System.out.println("Renaissance Rich System > Registration");
         System.out.println("Please fill in the personal registration information");
         System.out.println("username:");
    userNamer=input.next();
         System.out.println("Password:");
    password=input.next();
    System.out.println(" ");
    cardNumber=(int)(Math.random()*(max-min))+min;
         System.out.println("Registration is successful, please remember your membership card number");
         System.out.println("username\t"+"password\t"+"member card number\t");
    System.out.println(userNamer+"\t"+password+"\t"+cardNumber);
    isRegister=true;
    break;
   case 2:
         System.out.println("Renaissance Rich System>Login");
         / / Judge, if it is false, loop three times user login program
    if (isRegister) {
     for (int i = 1; i <= 3; i++) {
             System.out.println("Please enter username:");
      String inputUserNamer=input.next();
             System.out.println("Please enter password:");
      String inputPassWord=input.next();
             / / Determine the user name and password entered above are correct, the actual login is successful
      if (userNamer.equals(inputUserNamer)&&password.equals(inputPassWord)) {
               System.out.println("Welcome: "+inputUserNamer);
               / / Returns true, the algorithm to end this case
       isLogin=true;
       break;
      }
             //If you make a mistake, judge it three times or less and prompt the user to have several chances.
      else if (i<3) {
               System.out.println("Username or password is incorrect, and there are "+(3-i)+"opportunity"+"\n");
       
      } else {
               System.out.println("You entered the error three times");
      }
     }
    }
    break;
   case 3:
         System.out.println("Renaissance Rich System > Lucky Draw");
         / / Randomly extract four-digit numbers
    if(isLogin){
              int[] luckyNums = new int[10];
              for(int i=0;i<luckyNums.length;i++){
                  luckyNums[i] = (int)(Math.random()*(max-min))+min;
              }
                             / / Enter the card number
                 System.out.print("Please enter your card number:");
          int youCard = input.nextInt();
        int i = 0;
                 System.out.print("\n today's lucky number is:");
                 / / Determine whether the card number entered by the user is consistent with the randomly generated random number
        for(i=0;i<luckyNums.length;i++){
            System.out.print(luckyNums[i]+" ");
        }
        for(i=0;i<luckyNums.length;i++){
            if(luckyNums[i]==youCard){
                     System.out.println("\n Congratulations! You are a lucky member of the day!");
          break;
          }
         }
         if(i==luckyNums.length){
                     System.out.println("\n sorry! You are not a lucky member of today!");
          }
        }else{
                   System.out.println("Please login first, then draw!");
                   System.out.println("Continue?(y/n)");
         continueChoice = input.next();
        }
       break;
       default:
                     System.out.println("Your input is incorrect");
          break;
     }
           System.out.print("Continue?(y/n):");
     continueChoice = input.next();
           }while("y".equals(continueChoice));//If the user enters y, it will continue to loop large loop body
                   / / If the user enters n, then exit the program
     if("n".equals(continueChoice)){
             System.out.println("System exit, thank you for using!");
      }
    }
  }

OUTPUT