我试图打印出我已经在不同开关情况下声明的不同变量，它们都在for循环中的一个开关块中，但编译器不允许我使用变量。给我一个＆＃34;找不到符号＆＃34;错误。
以下是代码：
public static void main(String[] args) {
double hammer = 3.25, nails = 5.25, paint = 4.75, paintBrush = 2.25, balance = 50.00;
Scanner input = new Scanner(System.in);
System.out.println("Local Hardware Point of Sales");
System.out.println("\t::MENU::");
System.out.println("1. Purchase Items\n2. Display current purchases\n3. Display account balance\n4. Complete transactions and Exit");
System.out.print("Enter choice: ");
int choice = input.nextInt();
switch(choice){
case 1:
for(int i = 0; i <= 2; i++){
System.out.println("\n\tPurchase Items");
System.out.println("What items would you like to purchase?");
System.out.println("\tItems \t\tPrices");
System.out.println("\tHammer\t\t-$3.25\n\tNails\t\t-$3.25\n\tPaint\t\t-$3.25\n\tPaint Brush\t-$3.25");
String item = input.next();
switch (item) {
case "Hammer":
case "hammer":
System.out.println("How many Hammers would you like to purchase?");
int hItem = input.nextInt();
System.out.println("Starting Balance: $" + balance);
double hPrice = hItem*hammer;
System.out.println("Cost for " + hItem + " Hammers: $" + hPrice);
double hBalance = balance - hPrice;
System.out.println("Final Balance: $" + hBalance);
if(hBalance > 50.00){
System.out.println("WARNING: YOU HAVE INSUFFICIENT FUNDS FOR THIS PURCHASE. YOU CANNOT PURCHASE 30 NAILS.");
System.out.println("You will be returned to the main menu...");
}
else{
System.out.println("\nPurchase the "+ hItem+ " Hammers (Y/N)");
String ch = input.next();
if(ch.equals("Yes") || (ch.equals("Y")) || (ch.equals("y")) ){
System.out.println("You purchased "+hItem+"Hammers for "+ hPrice);
}
}
break;
case "Nails":
case "nails":
System.out.println("How many Nails would you like to purchase?");
int nItem = input.nextInt();
System.out.println("Starting Balance: $" + balance);
double nPrice = nItem*nails;
System.out.println("Cost for " + nItem + " Nails: $" + nPrice);
double nBalance = balance - nPrice;
System.out.println("Final Balance: $" + nBalance);
if(nBalance > 50.00){
System.out.println("WARNING: YOU HAVE INSUFFICIENT FUNDS FOR THIS PURCHASE. YOU CANNOT PURCHASE 30 NAILS.");
System.out.println("You will be returned to the main menu...");
}
else{
System.out.println("\nPurchase the "+ nItem+ " Nails (Y/N)");
String ch = input.next();
if(ch.equals("Yes") || (ch.equals("Y")) || (ch.equals("y")) ){
System.out.println("You purchased "+nItem+" Nails for "+ nPrice);
}
}
break;
case "Paint":
case "paint":
System.out.println("How many Paints would you like to purchase?");
int pItem = input.nextInt();
System.out.println("Starting Balance: $" + balance);
double pPrice = pItem*nails;
System.out.println("Cost for " + pItem + " Paints: $" + pPrice);
double pBalance = balance - pPrice;
System.out.println("Final Balance: $" + pBalance);
if(pBalance > 50.00){
System.out.println("WARNING: YOU HAVE INSUFFICIENT FUNDS FOR THIS PURCHASE. YOU CANNOT PURCHASE 30 NAILS.");
System.out.println("You will be returned to the main menu...");
}
else{
System.out.println("\nPurchase the "+ pItem+ " Paints (Y/N)");
String ch = input.next();
if(ch.equals("Yes") || (ch.equals("Y")) || (ch.equals("y")) ){
System.out.println("You purchased "+pItem+" Paints for "+ pPrice);
}
}
break;
case "Paint Brush":
case "paint brush":
System.out.println("How many Paint Brushes would you like to purchase?");
int pbItem = input.nextInt();
System.out.println("Starting Balance: $" + balance);
double pbPrice = pbItem*nails;
System.out.println("Cost for " + pbItem + " Paint Brushes: $" + pbPrice);
double pbBalance = balance - pbPrice;
System.out.println("Final Balance: $" + pbBalance);
if(pbBalance > 50.00){
System.out.println("WARNING: YOU HAVE INSUFFICIENT FUNDS FOR THIS PURCHASE. YOU CANNOT PURCHASE 30 NAILS.");
System.out.println("You will be returned to the main menu...");
}
else{
System.out.println("\nPurchase the "+ pbItem+ " Paint Brushes (Y/N)");
String ch = input.next();
if(ch.equals("Yes") || (ch.equals("Y")) || (ch.equals("y")) ){
System.out.println("You purchased "+pbItem+" Paint Brushes for "+ pbPrice);
}
}
break;
default:
break;
}
System.out.println("\nMake another purchase? (Y/N)");
String ans = input.next();
if(ans.equals("n"))
System.out.println("\tCurrent Receipt");
System.out.println("Items \t\tQuantity \t\tPrice Per \t\tTotal Price");
System.out.println("Hammer \t\t"+**hItem**+" \t\t\t"+hammer+" \t\t\t"+**hPrice**);
System.out.println("Nails \t\t"+**nItem**+" \t\t\t"+nails+" \t\t\t"+**nPrice**);
System.out.println("Paint \t\t"+**pItem**+" \t\t\t"+paint+" \t\t\t"+**pPrice**);
System.out.println("Paint Brush \t\t"+**pbItem**+" \t\t\t"+paintBrush+" \t\t\t"+**pbPrice**);
}
}
}
}
我加粗了给出错误的变量。 P.s我不允许使用这个项目的方法，严格的条件语句和循环。
此外，如果有人不介意，我会尝试为＃34; Paint Brush＆＃34;但是使用input.next（）时空间有问题，当我使用input.nexLine（）时，它完全忽略了输入并结束了程序，所以不得不恢复到next（）。
如果有人可以提供帮助，请多多感激。非常感谢
答案 0 :(得分：1)
声明在switch-case之外给出错误的变量。目前，他们的范围仅限于E/AndroidRuntime: FATAL EXCEPTION: Thread-4
Process: com.example.lucadigiammarino.biogame, PID: 3569
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
at android.os.Handler.<init>(Handler.java:114)
at android.os.CountDownTimer$1.<init>(CountDownTimer.java:114)
at android.os.CountDownTimer.<init>(CountDownTimer.java:114)
at com.example.lucadigiammarino.biogame.GameCountDownTimer.<init>(GameCountDownTimer.java:0)
at com.example.lucadigiammarino.biogame.GameView.startTimer(GameView.java:135)
at com.example.lucadigiammarino.biogame.GameView.run(GameView.java:306)
at java.lang.Thread.run(Thread.java:761)
部分的内部，这意味着对于其余代码（[m,n] = size(A)之外），它们不存在。< / p>