错误消息：“标识符预计”

我正在学习书籍“Java，如何编程”练习。我应该编写一个程序，以英里为单位驱动用户类型，并使用公升汽油用于未确定的行程次数。错误消息：“标识符预计”

该程序应该打印每英里每公升的旅程，并在最后平均英里公升。

我应该使用定点控制的重复，并打印英里公升作为浮点值。

总是收到的错误消息时，我试图编译：

GasolineUsage.java:39：预期 milPrLiter =（双）totalMil/totalLiters; （“The car drives％.2f miles pr liter gasoline \ n \ n”，milPrLiter）;以及其中，
^ GasolineUsage.java:40：类型System.out.printf的非法启动（ “汽车驱动％.2f英里PR升汽油\ n \ n” 个，milPrLiter）;
^ GasolineUsage.java:40： expected System.out.printf（“The car drives％.2f miles pr liter gasoline \ n \ n”，milPrLiter）;

^GasolineUsage.java:42：类，接口，或枚举预期}^5个错误

的代码如下：

import java.util.Scanner; 
public class GasolineUsage 
{ 

    public static void main(String[] args) 
    {  
     int totalMil = 0; 
     int totalLiters = 0; 
     double milPrLiter1 = 0; 
     double milPrLiter; 

     Scanner inputMil = new Scanner(System.in); 
     Scanner inputLiters = new Scanner(System.in); 

     System.out.print("Type in miles first trip, to end type: -1 "); 
      int mil = inputMil.nextInt(); 
     System.out.print("Type in liters of gasoline used on first trip "); 
      int liters = inputLiters.nextInt(); 
      totalMil = totalMil + mil; 
      totalLiters = totalLiters + liters; 
     milPrLiter1 = (double) mil/liters; 
     System.out.printf("(%.2f miles pr liter this trip.)\n", milPrLiter1); 

     System.out.print("Type in miles on next trip "); 
      while (mil != -1) 
       { 
       mil = inputMil.nextInt(); 
        if (mil != -1) 
         {totalMil = totalMil+ mil; 

         System.out.print("Type in lters used on next trip: "); 
         liters = inputLiters.nextInt();} 
         totalLiters = totalLiters + liters; 

         milPrLiter1 = (double) mil/liters; 
         System.out.printf("(%.2f miles pr liter this trip.)\n", milPrLiter1);} 
       } 

       milPrLiter = (double) totalMil/totalLiters; 
       System.out.printf("The car drives %.2f miles pr liter gasoline\n\n", milPrLiter);    
    } 
}

任何人都可以帮我吗？

来源

2011-09-24 user820913

计算你的开合花括号，因为它们应该匹配。隐藏在代码中的额外左大括号会在您搜索时发现。请注意，对于这种类型的错误，查看抛出错误的行上方总是很好。

来源

2011-09-24 20:42:08

错误消息：“标识符预计”

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