Java Restaurant Bill

/* Write a program that computes the tax ad tip on a restaurant bill
 * The program should ask the user to enter the charge for the meal. 
 * The tax should be 6.75 percent of the meal charge. The tip 
 * should be 15 percent of the total after adding the tax. Display 
 * the meal charge, tax amount, and the total bill on the screen. 
 */

import java.util.Scanner;


public class RestaurantBill1 
{
	public static void main(String[] args) 
	{
		double mealCharge;
		final double tax = 0.0675; // 6.75% constant amount of meal charge
		double taxAmount;
		double totalWithTax;
		final double tip = 0.20; // 20% constant amount of total amount after adding tax amount
		double tipAmount; 
		double totalBill;
		
		Scanner keyboard = new Scanner(System.in);
				
		//user has to enter the charge for the meal
		System.out.print("Please enter the charge for your meal $");
		mealCharge = keyboard.nextDouble();
		
		keyboard.nextLine();
				
		//calculate meal charge, tax amount, tip amount, and total bill
		taxAmount = mealCharge * tax;
		totalWithTax = mealCharge + taxAmount;
		tipAmount = totalWithTax * tip;
		totalBill = totalWithTax + tipAmount;
		
		//display to user meal charge, tax amount, tip amount, and total bill
		System.out.println("Your meal charge amount is $" + mealCharge + ".");
		System.out.println("Your tax amount is $" + taxAmount + ".");
		System.out.println("Your tip amount is $" + tipAmount + ".");
		System.out.println("-----------------------------------");
		System.out.println("Your total bill amount is $" + totalBill + ".");
				
		//end the program
		System.exit(0);
	}
}



import javax.swing.JOptionPane;


public class RestaurantBill2 
{
	public static void main(String[] args) 
	{
		String input;
		String bill;
		double mealCharge;
		final double tax = 0.0675; // 6.75% constant amount of meal charge
		double taxAmount;
		double totalWithTax;
		final double tip = 0.20; // 20% constant amount of total amount after adding tax amount
		double tipAmount; 
		double totalBill;
					
		//user has to enter the charge for the meal
		input = JOptionPane.showInputDialog("Please enter the charge for your meal $");
		mealCharge = Double.parseDouble(input);
			
		//calculate meal charge, tax amount, tip amount, and total bill
		taxAmount = mealCharge * tax;
		totalWithTax = mealCharge + taxAmount;
		tipAmount = totalWithTax * tip;
		totalBill = totalWithTax + tipAmount;
				
		//display to user meal charge, tax amount, tip amount, and total bill
		bill = "Your meal charge amount is $" + mealCharge + "." + "\n" +
						"Your tax amount is $" + taxAmount + "." + "\n" +
						"Your tip amount is $" + tipAmount + "." + "\n" +
	                    "-----------------------------------" + "\n" +
	                    "Your total bill amount is $" + totalBill + ".";
	      
		JOptionPane.showMessageDialog(null, bill);
	 		
		//end the program
		System.exit(0);
		}
	}

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