如何清除java中的控制台[复制]

Question

在我处理完一个“客户”之后，我用java搜索了很长时间来清除我的控制台。我所说的是我编写了代码，我可以让别人用我的java代码“买”东西，但我无法清除控制台或再次启动扫描仪。在他们使用完之后
我的代码在这里：

package restaurantmanagement;

import static java.lang.System.in;
import static java.lang.System.out;
import java.util.Scanner;

public class RestaurantManagement {
    public static void main(String[] args) {
        Scanner sc = new Scanner(in);
        double beefsandwhichcombo = 9.00;
        double chickensandwhichcombo = 10.00;
        double frenchfries = 2.99;
        double eggsandwhich = 6.99;
        double sDrink = 1.50;
        double mDrink = 2.50;
        double lDrink = 3.50;
        out.println("Our menu:");
        out.println("1. Beef Sandwhich Combo - " + beefsandwhichcombo);
        out.println("2. Chicken Sandwhich Combo - " + chickensandwhichcombo);
        out.println("3. French Fries - " + frenchfries);
        out.println("4. Egg Sandwhich - " + eggsandwhich);
        out.println("5. Small Drink - " + sDrink);
        out.println("6. Medium Drink - " + mDrink);
        out.println("7. Large Drink - " + lDrink);
        double Total = 0;
        String whatbuy;
        out.println("What do you want to buy?");
        whatbuy = sc.nextLine();
        if (null != whatbuy) switch (whatbuy) {
            case "1":
                Total = Total + beefsandwhichcombo;
                break;
            case "2":
                Total = Total + chickensandwhichcombo;
                break;
            case "3":
                Total = Total + frenchfries;
                break;
            case "4":
                Total = Total + eggsandwhich;
                break;
            case "5":
                Total = Total + sDrink;
                break;
            case "6":
                Total = Total + mDrink;
                break;
            case "7":
                Total = Total + lDrink;
                break;
            case "No":
                Total = Total;
                break;
            default:
                break;
        }
        String anyelse;
        out.println("Do you want anything else?");
        anyelse = sc.nextLine();
        if (null != anyelse) switch (anyelse) {
            case "1":
                Total = Total + beefsandwhichcombo;
                break;
            case "2":
                Total = Total + chickensandwhichcombo;
                break;
            case "3":
                Total = Total + frenchfries;
                break;
            case "4":
                Total = Total + eggsandwhich;
                break;
            case "5":
                Total = Total + sDrink;
                break;
            case "6":
                Total = Total + mDrink;
                break;
            case "7":
                Total = Total + lDrink;
                break;
            case "No":
                Total = Total;
                break;
            default:
                break;
        }
        String anyelse1;
        out.println("Do you want anything else?");
        anyelse1 = sc.nextLine();
        if (null != anyelse1) switch (anyelse1) {
            case "1":
                Total = Total + beefsandwhichcombo;
                break;
            case "2":
                Total = Total + chickensandwhichcombo;
                break;
            case "3":
                Total = Total + frenchfries;
                break;
            case "4":
                Total = Total + eggsandwhich;
                break;
            case "5":
                Total = Total + sDrink;
                break;
            case "6":
                Total = Total + mDrink;
                break;
            case "7":
                Total = Total + lDrink;
                break;
            case "No":
                Total = Total;
                 break;
            default:
                 break;
        }
        String coupon;
        out.println("Do you have a coupon? Y/N");
        coupon = sc.nextLine();
        if (null != coupon) switch (coupon) {
            case "Y":
                Total = Total / 1.5;
                break;
            case "N":
                Total = Total;
                break;
        }
        double tax = 1.24;
        Total = Total * tax;
        double Totald1 = Total;
        double w1 = Totald1;
        double m1 = w1;
        double y1 = m1;
        out.println("Your total : $" + Total);
        Total = 0;
    }

}

我得到的是：

Our menu:
1. Beef Sandwhich Combo - 9.0
2. Chicken Sandwhich Combo - 10.0
3. French Fries - 2.99
4. Egg Sandwhich - 6.99
5. Small Drink - 1.5
6. Medium Drink - 2.5
7. Large Drink - 3.5
What do you want to buy?
6
Do you want anything else?
2
Do you want anything else?
3
Do you have a coupon? Y/N
Y
Your total : $12.805066666666667

但是我想要的是，如果我完成了这个，我的java代码将看到它说的是你的总数，并将它保持在那里几秒钟，然后重置。你知道怎么做吗
编辑：
此外，为了一箭双雕，您知道如何对双精度小数点超过2位的情况进行java测试，然后将其四舍五入到第二位，例如，13.424将变为13.42<顺便说一句，我正在使用NetBeans和Eclipse。

Answer 1

你可以用这个也许：

System.out.println("\u000c");

Answer 2

如果您使用linux，您可以在运行时执行该命令。getRuntime（）。执行董事（“明确”）

如果你想设置定时器。了解Timer和TimerWork类

Answer 3

您可以使用此选项将十进制数更改为2。

DecimalFormat df = new DecimalFormat("##.##");
total = Double.parseDouble(df.format(total));