所以我的问题是我想要求输入使用扫描仪的信息，但它根本不打印出来。当它显示跳过的扫描仪的值时，Scanner CheeseType = new Scanner(System.in);，我得到 null。
package classesProject;
import java.util.Scanner;
class Pizza {
String size;
String cheese;
int numToppings;
double price = 0;
}
public class pizzaTime {
public static void main(String[] args) {
Pizza order1 = new Pizza();
double priceOfSize = 0;
double priceOfCheese = 0;
double priceOfToppings = 0;
System.out.println("Pizza size small, medium or large: ");
Scanner sizeAsker = new Scanner(System.in);
order1.size = sizeAsker.nextLine();
if(order1.size == "small") {
priceOfSize = 3.0;
} else if(order1.size == "medium") {
priceOfSize = 5.0;
} else if(order1.size == "large") {
priceOfSize = 7.0;
System.out.println("Cheese type: normal, xtra, or thic: ");
Scanner cheeseType = new Scanner(System.in);
order1.cheese = cheeseType.nextLine();
}if(order1.cheese == "normal") {
priceOfCheese = 0.0;
} else if(order1.cheese == "xtra") {
priceOfCheese = 0.5;
} else if(order1.cheese == "thic") {
priceOfCheese = 1.0;
}
System.out.println("Number of toppings: ");
Scanner toppingAsker = new Scanner(System.in);
order1.numToppings = toppingAsker.nextInt();
priceOfToppings = order1.numToppings * 0.25;
double orderTotalPrice = priceOfSize + priceOfCheese;
System.out.println("Pizza size: " + order1.size + "\n"
+ "Cheese type: " + order1.cheese + "\n"
+ "Number of toppings: " + order1.numToppings + "\n"
+ "Order total: " + orderTotalPrice
);
}
}
被跳过的是:
System.out.println("Cheese type: normal, xtra, or thic: ");
Scanner cheeseType = new Scanner(System.in);
order1.cheese = cheeseType.nextLine();
运行后，控制台显示:
Pizza size small, medium or large:
small
Number of toppings:
2
Pizza size: small
Cheese type: null
Number of toppings: 2
Order total: 0.0
正如您所看到的，它直接从披萨尺寸扫描仪跳到配料数量扫描仪，而不是按顺序进行。 我不知道为什么，或者我应该做什么来解决这个问题。
最佳答案
由于您在下一个问题后关闭括号，因此仅针对大披萨询问此问题
else if(order1.size == "large") {
priceOfSize = 7.0;
System.out.println("Cheese type: normal, xtra, or thic: ");
Scanner cheeseType = new Scanner(System.in);
order1.cheese = cheeseType.nextLine();
}
如果您在priceOfSize = 7 之后添加右括号，则可以继续。不过，您仍然需要在其他地方修复丢失的括号。
关于Java 跳过打印语句扫描器，具体，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54322574/