Assignemnt #103 and Keychains for Sale, real ultimate power

Code

  /// Name: Marco Correa
  /// Period: 5
  /// Program Name: Keychains for Sale, real ultimate power
  /// File Name: Keychains for Sale, real ultimate power.java
  /// Date Finished: 3/17/2016



  import java.util.Scanner;

  public class KeychainsForSaleRealPower
  {
	  public static void main ( String[] args )
	  {
		  Scanner keyboard = new Scanner(System.in);
		  int choice, numKeys = 0;
		  double price = 10.0, tax = 0.0825, baseShipping = 5.0, additionalShipping = 1.0;
		
		  System.out.println( "Ye Olde Keychain Shoppe" );
		
		  do {
			  System.out.println( "\nYour order currently contains " + numKeys + " keychains." );
			  System.out.println( "\n1. Add Keychains to Order" );
			  System.out.println( "2. Remove Keychains from Order" );
			  System.out.println( "3. View Current Order" );
			  System.out.println( "4. Checkout" );
			  System.out.print( "\nPlease enter your choice: " );
			  choice = keyboard.nextInt();
		
			  if ( choice == 1 )
			  {
				  numKeys = addKeychains(numKeys);
			  }
			  else if ( choice == 2 )
			  {
				  numKeys = removeKeychains(numKeys);
			  }
			  else if ( choice == 3 )	
			  {
				  viewOrder(numKeys, price, tax, baseShipping, additionalShipping );
			  }
			  else if ( choice == 4 )
			  {
				  checkout(numKeys, price, tax, baseShipping, additionalShipping );
			  }
			  else
			  {
				  System.out.println("Sorry that is not a valid selection");
			  }
		
		  } while ( choice != 4 );
	  } 
	
	  public static int addKeychains( int keys )
	  {
		  Scanner keyboard = new Scanner(System.in);
		  int addKeys = 0;
		
		  do
		  {
			  System.out.print( "\nYou have " + keys + " keychains. How many to add? " );
			  addKeys = keyboard.nextInt();
			  if ( addKeys < 0 )
			  {
				  System.out.println( "Please enter a positive integer." );
			  }
		  } while ( addKeys < 0 );
		
		  keys += addKeys;
		  return keys;
	  }
	  public static int removeKeychains( int keys )
	  {
		  int subKeys = 0;
		  Scanner keyboard = new Scanner(System.in);
		
		  do
		  {
			  System.out.print( "\nYou have " + keys + " keychains. How many to remove? " );
			  subKeys = keyboard.nextInt();
			  if ( (keys - subKeys) < 0 )
			  {
				  System.out.println ( "You cannot have fewer than 0 keys" );
			  }
		  } while ( (keys - subKeys) < 0 ); 
		
		  keys -= subKeys;
		
		  return keys;
	  }
	  public static void viewOrder(int keys, double price, double tax, double baseShipping, double additionalShipping )
	  {
		  double total = (price * keys) + baseShipping + ( additionalShipping * keys );
		  System.out.println( "\nYou have " + keys + " keychains." );
		  System.out.println( "\nKeychains cost $" + price + " each." );
		  System.out.println( "The cost for shipping is $" + baseShipping  + " plus $" + ( additionalShipping * keys ) + " ($1   for each keychain)." );
		  System.out.println( "Total cost is $" + (total + (total * tax)) + " after adding tax amount of $" + (total * tax) + "  ." );
	  }
	  public static void checkout( int keys, double price, double tax, double baseShipping, double additionalShipping )
	  {
		  Scanner keyboard = new Scanner(System.in);
		  System.out.println( "\nCHECKOUT" );
		  System.out.print( "What is your name? " );
		  String name = keyboard.nextLine();
		  viewOrder( keys, price, tax, baseShipping, additionalShipping );
		  System.out.println( "Thanks for your order, " + name + "!" );
		
	  }
  }


    

Picture of the output