Question

所以我在第一学期就需要完成一个餐厅订单项目。一切都进展顺利，但我对这个项目的规定感到困惑：

III。一旦当前用餐者的选择被显示，则显示他们选择的所有项目的列表。如果他们在每个菜单上选择第一个选项，则不显示该项目：无选择。

没有选择是数组的索引0。我怎样才能排除索引0？

这是4个while while循环中的一个，用户输入他们的选择并验证数据，如果有帮助，我完全被卡住了。谢谢！

System.out.println("Please select one item from the beverages menu.");
do {
    for(int j = 0; j < beveragesArray.length; j++) {
        System.out.println((j + 1) + ". " + 
                           beveragesArray[j] + " $" + beveragesPriceArray[j]);
    }
    System.out.println("Please enter your selection #: ");
    beverageSelection = input.nextInt();

    if(beverageSelection < 1 || beverageSelection > beveragesArray.length) {
        System.out.println("We don't serve that, what else would you like?");
        badDataFlag = true;
    } else {
        badDataFlag = false;
        accumulator += beveragesPriceArray[beverageSelection - 1];
        break;
    }               
} while (badDataFlag = true);

这是项目的输出结果。

Please select one item from the Appetizer menu.

1. **No selection** $0.00
2. Deep Fried Calamari $7.50
3. Soup du Jour $4.99
4. Garden Salad $3.99
5. Garlic Bread $4.50

Please enter your selection #: 6
INVALID SELECTION. Please enter your selection #: 1

Please select one item from the Entrée menu.

1. **No selection** $0.00
2. Rib-Steak $15.95
3. Fettuccini Alfredo $11.25
4. Pan-Fried Sole $17.95
5. Mediterranean Platter $13.50
6. Vegetarian Lasagna $9.00

Please enter your selection #: 4

Please select one item from the Dessert menu.

1. **No selection** $0.00
2. Ice Cream Sundae $2.95
3. Cheesecake $5.00
4. Chocolate Truffle Cake $6.00
5. Raspberry Mousse $4.50

Please enter your selection #: 5

Please select one item from the Beverage menu.

1. **No selection** $0.00
2. Water $0.00
3: Juice
4. Pop $2.00
5. Milk $2.00
6. Coffee $1.75
7. Tea $1.75

Please enter your selection #: 6

Thank you, Evelyn. Your order consists of:

Pan-Fried Sole
Raspberry Mousse
Tea

Answer 1

虽然有很多方法可以解决这个问题，但最简单的方法是添加＆＃34;项目1无选择＆＃34;正如您当前在打印输出时那样，只需使用if语句。如果值为第1项，则不打印任何内容，否则打印它是什么。

虽然您的相应代码没有发布，但它可能就像这样简单。

if ( itemSelectedindex > 0 ){
     // print something tasty
}

Answer 2

你可以声明String，以累积顺序，而不是添加index = 0的项目从所有do-while循环中声明这个字符串，可能是main（）

中的第一行

String customerOrder = "";

并在此位置添加新的if语句

if(beverageSelection < 1 || beverageSelection > beveragesArray.length) {
    System.out.println("We don't serve that, what else would you like?");
    badDataFlag = true;
} else {
    badDataFlag = false;
    accumulator += beveragesPriceArray[beverageSelection - 1];

    //NEW CODE//
    if(beverageSelection != 1){//1. **No selection** $0.00
        customerOrder += beveragesArray[beverageSelection - 1] + "\n";
    }
    //NEW CODE//

    break;
}

最后，在挑选完所有项目后，

System.out.println("Thank you, Evelyn. Your order consists of:");
System.out.println(customerOrder );

排除数组的索引0作为输出选项？

2 个答案: