開關櫃外的變量java

Question

我試圖打印出不同的開關櫃中已經聲明的不同變量，它們都在for循環中的一個開關塊中，但編譯器不允許使用變量。給我一個「找不到符號」的錯誤。

下面的代碼：

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**); 
    } 
    } 
} 

}

我加粗的那是給錯誤的變量。 P.s我不允許使用這個項目的方法，嚴格的條件語句和循環。

此外，如果任何人不介意，我想獲得「畫筆」的字符串輸入，但使用input.next（）有問題的空間，當我使用input.nexLine（）它完全忽略輸入並結束程序，所以不得不恢復到next（）。

請任何人都可以幫忙，非常感謝。非常感謝

Answer 1

聲明在switch-case之外給你一個錯誤的變量。目前它們的範圍僅限於case部分的內部，這意味着對於其餘代碼（在case之外）它們不存在。