我正在尝试读取用户输入，似乎没有将变量设置为输入。
例如：
System.out.println("Would you like Syrup?(Y/N)");
String wantSyrup = keyboard.next();
char syrupWant = wantSyrup.charAt(0);
switch (syrupWant){
case 'y':
System.out.println("Which syrup would you like?");
System.out.println("Hot fudge, Chocolate, Caramel, Strawberry");
syrupChoice = keyboard.nextLine();
keyboard.nextLine();
System.out.println("You entered: "+syrupChoice);
if((syrupChoice.equalsIgnoreCase(hotFudge))
|| (syrupChoice.equalsIgnoreCase(chocolateSyrup))
|| (syrupChoice.equalsIgnoreCase(caramel))
|| (syrupChoice.equalsIgnoreCase(strawberrySyrup)))
{
System.out.println(syrupChoice);
}else{
System.out.println("Not a valid choice. You now have Hot Fudge as your syrup.");
syrupChoice = hotFudge;
}
break;
default: break;
}
当我输入任何类型的糖浆时，控制台会回来。
Would you like Syrup?(Y/N)
y
Which syrup would you like?
Hot fudge, Chocolate, Caramel, Strawberry
caramel
You entered:
Not a valid choice. You now have Hot Fudge as your syrup.
import java.util.Scanner;
import java.text.*;
public class SundaeLab {
public static void main(String[] args){
Sundae userSundae = new Sundae();
Scanner keyboard = new Scanner(System.in);
String hotFudge = "Hot Fudge";
String chocolateSyrup = "chocolate";
String caramel = "caramel";
String strawberrySyrup = "strawberry";
String syrupChoice = "";
String vanilla = "vanilla";
String peanutButter = "peanut butter";
String chocolate = "chocolate";
String coconut = "coconut";
String cookieDough = "cookie Dough";
String coffee = "coffee";
String strawberry = "strawberry";
String butterPecan = "butter pecan";
double subtotal;
double tax;
final double SUFFOLK_SALES_TAX = .08625;
double costOfSundae;
DecimalFormat df = new DecimalFormat("#.##");
System.out.println("What flavor of Ice Cream would you like?");
System.out.println("Your choices are: Vanilla, Peanut Butter, Chocolate, Coconut, Cookie Dough,");
System.out.println(" Coffee, Strawberry, Butter Pecan.");
String flavor = keyboard.nextLine();
System.out.println("You entered: "+flavor);
System.out.println("How many scoops of ice cream would you like?");
System.out.println("One scoop is $1.79. Additional scoops are $1.00 Each.");
System.out.println("You can have 6 scoops max");
int numberOfScoops = keyboard.nextInt();
System.out.println("You entered: "+numberOfScoops);
String dToppings = "";
//System.out.UserSundae.getFlavor();
if (flavor.equalsIgnoreCase("vanilla")){
userSundae.setFlavor(vanilla);
}
if (flavor.equalsIgnoreCase("peanut butter")){
userSundae.setFlavor(peanutButter);
}
if (flavor.equalsIgnoreCase("chocolate")){
userSundae.setFlavor(chocolate);
}
if (flavor.equalsIgnoreCase("coconut")){
userSundae.setFlavor(coconut);
}
if (flavor.equalsIgnoreCase("cookie dough")){
userSundae.setFlavor(cookieDough);
}
if (flavor.equalsIgnoreCase("coffee")){
userSundae.setFlavor(coffee);
}
if (flavor.equalsIgnoreCase("strawberry")){
userSundae.setFlavor(strawberry);
}
if (flavor.equalsIgnoreCase("butter pecan")){
userSundae.setFlavor(butterPecan);
}
if (!flavor.equalsIgnoreCase(vanilla) && !flavor.equalsIgnoreCase(coffee) && !flavor.equalsIgnoreCase(peanutButter)&&
!flavor.equalsIgnoreCase(chocolate)&& !flavor.equalsIgnoreCase(coconut) && !flavor.equalsIgnoreCase(cookieDough)&&
!flavor.equalsIgnoreCase(strawberry)&& !flavor.equalsIgnoreCase(butterPecan)){
userSundae.setFlavor(vanilla);
flavor = vanilla;
System.out.println("We Changed your flavor to Vanilla");
}
if ( numberOfScoops <= 6 && numberOfScoops > 0){}
else{
userSundae.Sundae();
System.out.println("We Changed your scoop amount to: 2");
numberOfScoops = 2;
}
if (numberOfScoops>1){
subtotal = (numberOfScoops - 1)*1.00 + 1.79;
}
else{
subtotal = 1.79;
}
System.out.println("Would you like Whipped Cream?(Y/N)");
String wantsWhipped = keyboard.next();
char whippedWants = wantsWhipped.charAt(0);
if ( whippedWants == 'y'){
String dTopppings = dToppings + "Whipped Cream ";
System.out.println("Whipped cream added");
}
System.out.println("Would you like Syrup?(Y/N)");
String wantSyrup = keyboard.next();
char syrupWant = wantSyrup.charAt(0);
switch (syrupWant){
case 'y':
System.out.println("Which syrup would you like?");
System.out.println("Hot fudge, Chocolate, Caramel, Strawberry");
syrupChoice = keyboard.nextLine();
keyboard.nextLine();
System.out.println("You entered: "+syrupChoice);
if((syrupChoice.equalsIgnoreCase(hotFudge))
|| (syrupChoice.equalsIgnoreCase(chocolateSyrup))
|| (syrupChoice.equalsIgnoreCase(caramel))
|| (syrupChoice.equalsIgnoreCase(strawberrySyrup)))
{
System.out.println(syrupChoice);
}else{
System.out.println("Not a valid choice. You now have Hot Fudge as your syrup.");
syrupChoice = hotFudge;
}
break;
default: break;
}
System.out.println("Our Deluxe toppings are an extra cost of .75 cents each.");
System.out.println("Would you like to see them? (Y/N)");
String deluxeList = keyboard.nextLine();
if(deluxeList.equalsIgnoreCase("y")){
System.out.println("Would you like M&M's(Y/N)");
String mM = keyboard.nextLine();
if (mM.equalsIgnoreCase("y")){
dToppings = dToppings + "M&M's ";
subtotal = subtotal + .75;
System.out.println("M&M's Added");
}
System.out.println("Would you like Crushed Oreos(Y/N)");
String oreos = keyboard.nextLine();
if (oreos.equalsIgnoreCase("y")){
dToppings = dToppings + "Crushed Oreos ";
subtotal = subtotal + .75;
System.out.println("Crushed Oreo's Added");
}
System.out.println("Would you like Reeses pieces(Y/N)");
String reeses = keyboard.nextLine();
if (reeses.equalsIgnoreCase("y")){
dToppings = dToppings + "Reese's Pieces ";
subtotal = subtotal + .75;
System.out.println("Reese's Peices Added");
}
System.out.println("Would you like Brownie Crunchies(Y/N)");
String crunchies = keyboard.nextLine();
if (crunchies.equalsIgnoreCase("y")){
dToppings = dToppings + "Brownie Crunchies ";
subtotal = subtotal + .75;
System.out.println("Brownie Crunchies Added");
}
System.out.println("Would you like Mint Chocolate Chips(Y/N)");
String chips = keyboard.nextLine();
if (chips.equalsIgnoreCase("y")){
dToppings = dToppings + "Mint Chocolate Chips ";
subtotal = subtotal + .75;
System.out.println("Mint Chocolate Chips Added");
}
}
tax = subtotal * SUFFOLK_SALES_TAX;
costOfSundae = tax + subtotal;
System.out.println("You got "+numberOfScoops+" Scoops of "+flavor);
System.out.println("Your syrup is: "+syrupChoice);
System.out.println("Your toppings are: "+dToppings);
System.out.println("Your subtotal is: "+ df.format(subtotal));
System.out.println("the tax is: "+df.format(tax));
System.out.println("Your total is: "+df.format(costOfSundae));
}
}
答案 0 :(得分：1)
更改
syrupChoice = keyboard.nextLine();
代表
syrupChoice = keyboard.next();
正如您在此输出中所看到的那样：
You entered:
即使您输入了caramel，也显然不是syrupChoice中存储的内容。
请参阅What's the difference between next() and nextLine() methods from Scanner class?了解两种方法之间的区别。
答案 1 :(得分：1)
在keyboard.next（）之后添加keyboard.nextLine（）。这将读入在输入Y或N响应后仍在缓冲区中挂起的换行符。