title: Using IF statement in simple java program to apply discount
body: <p>I have been using a search tool to look for an answer but I am now stuck after being able to fix several of my previous problems. I was able to compare and make adjustments but now I don't understand what is wrong with my program.</p>
  
  <p>I am in my first year learning computer programming starting with Java. I have read many people saying to use <code>equalsIgnoreCase</code> but we have yet to learn it and this is how I was taught as of this moment. I also read a post saying <code>if (discount)</code> maybe better than <code>if (discount == true)</code> but I have never used an if statement without displaying the variable next to it yet.</p>
  
  <p>At first, it was giving the discount to <em>every</em> name I input, including those not in the 4 names designated to give the discount. Now it is not giving a discount to any of the 4 names (Mike, mike, Diane, diane).</p>
  
  <p>I feel like it is a very small error but I just can't seem to to figure it out.</p>
  
  <pre><code>import java.util.Scanner;
  import java.text.DecimalFormat;
  
  public class PizzaOrder
  {
  public static void main (String [] args)
  {
      DecimalFormat formatter = new DecimalFormat("#0.00");
  
      Scanner keyboard = new Scanner (System.in);
  
      String firstName;                   
      boolean discount = false;       
      int inches;                     
      char crustType;             
      String crust = "Hand-tossed"; 
      double cost = 12.99;            
      final double TAX_RATE = .08;    
      double tax;                     
      char choice;                        
      String input;                   
      String toppings = "Cheese ";    
      int numberOfToppings = 0;       
  
      System.out.println("Welcome to Mike and Diane's Pizza");
      System.out.print("Enter your first name:  ");
      firstName = keyboard.nextLine();
  
      if (firstName == "Mike" || firstName == "mike")
      {
          discount = true;
      }
      if (firstName =="Diane" || firstName == "diane")
      {
          discount = true;
      }
  
      System.out.println("Pizza Size (inches)   Cost");
      System.out.println("        10            $10.99");
      System.out.println("        12            $12.99");
      System.out.println("        14            $14.99");
      System.out.println("        16            $16.99");
      System.out.println("What size pizza would you like?"); 
      System.out.print("10, 12, 14, or 16 (enter the number only): ");
      inches = keyboard.nextInt();
  
      if (inches == 10)
      {
          cost = 10.99;
      }
      if (inches == 12)
      {
          cost = 12.99;
      }
      if (inches == 14)
      {
          cost = 14.99;
      }   
      if (inches == 16)
      {
          cost = 16.99;
      }
      else
          System.out.println("You have selected incorrect pizza size.");
          System.out.println("You have been assigned 12 inch pizza by default.");
  
      keyboard.nextLine();    
  
      System.out.println("What type of crust do you want? ");
      System.out.print("(H)Hand-tossed, (T) Thin-crust, or " +
          "(D) Deep-dish (enter H, T, or D): ");
      input = keyboard.nextLine();
      crustType = input.charAt(0);
  
      switch (crustType)
      {
          case 'H':
          case 'h':
              System.out.println("You have selected Hand-tossed crust.");
              break;
          case 'T':
          case 't':
              System.out.println("You have selected Thin-crust.");
              break;
          case 'D':
          case 'd':
              System.out.println("You have selected Deep-dish crust.");
              break;
          default:
              System.out.println("You have selected invalid type of crust.");
              System.out.println("You have been assigned Hand-tossed crust by default.");
              break;
      }
  
      System.out.println("All pizzas come with cheese."); 
      System.out.println("Additional toppings are $1.25 each,"
              +" choose from");
      System.out.println("Pepperoni, Sausage, Onion, Mushroom");
  
      System.out.print("Do you want Pepperoni?  (Y/N):  ");
      input = keyboard.nextLine();
      choice = input.charAt(0);
      if (choice == 'Y' || choice == 'y')
      {
          numberOfToppings += 1;
          toppings = toppings + "Pepperoni ";
      }
      System.out.print("Do you want Sausage?  (Y/N):  ");
      input = keyboard.nextLine();
      choice = input.charAt(0);
      if (choice == 'Y' || choice == 'y')
      {
          numberOfToppings += 1;
          toppings = toppings + "Sausage ";
      }
      System.out.print("Do you want Onion?  (Y/N):  ");
      input = keyboard.nextLine();
      choice = input.charAt(0);
      if (choice == 'Y' || choice == 'y')
      {
          numberOfToppings += 1;
          toppings = toppings + "Onion ";
      }
      System.out.print("Do you want Mushroom?  (Y/N):  ");
      input = keyboard.nextLine();
      choice = input.charAt(0);
      if (choice == 'Y' || choice == 'y')
      {
          numberOfToppings += 1;
          toppings = toppings + "Mushroom ";
      }
  
      cost = cost + (1.25*numberOfToppings);
  
      System.out.println();
      System.out.println("Your order is as follows: ");
      System.out.println(inches + " inch pizza");
      System.out.println(crust + " crust");
      System.out.println(toppings);       
  
      if (discount)
      {
          System.out.println("You are eligible for $2.00 discount.");
          cost -= 2.00;
      }
  
      System.out.println("The cost of your order is: $" + formatter.format(cost));
  
      tax = cost * TAX_RATE;
      System.out.println("The tax is:  $" + formatter.format(tax));
      System.out.println("The total due is:  $" + formatter.format((tax+cost)));
  
      System.out.println("Your order will be ready for pickup in 30 minutes.");
  }   
  }
  </code></pre>