Java Cash Register Program

package prog;

import java.text.DecimalFormat;
import java.util.Random;
import java.util.Scanner;

public class CashRegister {



	//variables

	String yn;

		//set 1
		int type;
		int sale;
		String item_name;
		double original_price,discount_amount,sales_price,tax,total;
		double sale_dec;
		String original_price_str,sale_percent,discount_amount_str,sales_price_str,tax_str,total_str;

		//set 2
		int type2;
		double money,change;
		double dollars,quarters,dimes,nickels,pennies;
		double dollars_fin,quarters_fin,dimes_fin,nickels_fin,pennies_fin;
		int d,q,di,n,p;
		String change_str;



	//objects
	DecimalFormat dec = new DecimalFormat("$0.00");
	DecimalFormat per = new DecimalFormat("0.00%");
	Scanner scan = new Scanner(System.in);
	Random rand = new Random();

	//methods

	//run method
	public void run() {
		run_loop();
	}

	//loop method
	public void run_loop() {
		run_cash();
		while (type == 1) {
			run_cash();
		}
	}

	//compiled method of every method required to run the cash register program
	public void run_cash() {
		type = 0;
		input();
		calc();
		output();
		input2();
		money_loop();
		calc2();
		output2();
		loop();
		while (type == 3) {
			loop();
		}
	}

	//asks the user for the first set of variables
	public void input() {
		//prompting user for some values..
		System.out.println("What will you be buying today?");
		item_name = scan.nextLine();
		System.out.println("Okay, how much does it cost?");
		original_price = scan.nextDouble();
	}

	//calculates those variables to define other variables
	public void calc() {
		//original price
		original_price_str = dec.format(original_price);
		//discount percent
		//sale = rand.nextInt(((14)+1)+1)*5;
		sale = 65;
		sale_dec = ((double) sale)/100;
		sale_percent = per.format(sale_dec);
		//discount amount
		discount_amount = sale_dec * original_price;
		discount_amount_str = dec.format(discount_amount);
		//sales price
		sales_price = original_price - discount_amount;
		sales_price_str = dec.format(sales_price);
		//tax
		tax = 0.07 * sales_price;
		tax_str = dec.format(tax);
		//total
		total = sales_price + tax;
		total_str = dec.format(total);
	}

	//outputs those variables for the user
	public void output() {
		System.out.println("Here is your info:");
		//System.out.println("Original Price of \"" + item_name + "\": " + original_price_str);
		System.out.println("Original price: \t" + original_price_str);
		System.out.println("Discount percent: \t" + sale_percent);
		System.out.println("Discount amount: \t" + discount_amount_str);
		System.out.println("Sales price: \t\t" + sales_price_str);
		System.out.println("Tax: \t\t\t" + tax_str);
		System.out.println("Total: \t\t\t" + total_str);

	}

	//asks the user for the second set of variables
	public void input2() {
		//prompts user for how much money they will be paying with
		type2 = 0;
		System.out.println(" ");
		System.out.println("How much money will you be paying with?");
		money = scan.nextDouble();
		scan.nextLine();
	}

	//in case the user gives an amount of money lower than the total, this stops them.
	public void money_loop() {
		if (money < total) {
			System.out.println("Insufficient funds, try again.");
			type2 = 1;
		}
		while (type2 == 1) {
			input2();
		}

	}

	//performs the calculations on the second set of variables
	public void calc2() {
		//change
		change = money - total;
		change_str = dec.format(change);
		//dollars
		dollars = change/1;
		dollars_fin = Math.floor(dollars);
		d = (int) dollars_fin;
		//quarters
		quarters = (change - dollars_fin)/.25;
		quarters_fin = Math.floor(quarters);
		q = (int) quarters_fin;
		//dimes
		dimes = (change - (dollars_fin + (quarters_fin * .25)))/.10;
		dimes_fin = Math.floor(dimes);
		di = (int) dimes_fin;
		//nickels
		nickels = (change - (dollars_fin + (quarters_fin * .25) + (dimes_fin * .10)))/.05;
		nickels_fin = Math.floor(nickels);
		n = (int) nickels_fin;
		//pennies
		pennies = (change - (dollars_fin + (quarters_fin * .25) + (dimes_fin * .10) + (nickels_fin * .05)))/0.01;
		System.out.println(pennies);
		pennies_fin = Math.floor(pennies);
		p = (int) pennies_fin;
	}

	//outputs the calculated variables
	public void output2() {
		System.out.println("Your change is: " + change_str);
		System.out.println("Dollars: \t" + d);
		System.out.println("Quarters: \t" + q);
		System.out.println("Dimes: \t\t" + di);
		System.out.println("Nickels: \t" + n);
		System.out.println("Pennies: \t" + p);
	}

	//actual loop
	public void loop() {
		System.out.println(" ");
		System.out.println("Would you like to buy anything else? (y/n)");
		yn = scan.nextLine();
		yn = yn.toLowerCase();
		if (yn.contentEquals("y")) {
			type = 1;
		}
		else if (yn.contentEquals("n")) {
			type = 2;
			System.out.println("Bye!");
		}
		else {
			System.out.println("Invalid arguments.");
			type = 3;
		}
	}

	public static void main(String[] args) {
		CashRegister prog = new CashRegister();
		prog.run();

	}

}