java - 编译器错误 : expected. 如何解决此问题？

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已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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这个问题是由拼写错误或无法再重现的问题引起的。虽然类似的问题可能是 on-topic在这里，这个问题的解决方式不太可能帮助 future 的读者。

已关闭 8 年前。

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我在这项作业中遇到了很多错误。我已经尽可能多地完成了，并且似乎一切都井井有条，但 JGrasp 告诉我有 49 个错误。我在第 30,31, 33, 36, 37, 40, 41, 42, 43, 47, 48, 54, 55, 56, 和 57 行遇到错误。根据我的教科书，我已经做对了一切。我该如何解决这个问题？

我在给我带来麻烦的每一行后面添加了“此处”注释。

完整程序:

import java.util.Scanner;

public class AverageRainfall { 
    public static void main(String[] args) {
        double monthRain = 0;          // Rain for a month
        double totalRain = 0;          // Rainfall accumulator
        double average = 0;            // Average rainfall
        // Keyboard input.
        Scanner keyboard = new Scanner(System.in);
        // Number of years.
        System.out.print("Enter the number of years: ");
        int years = 0; // Number of years
        years = keyboard.nextInt();
        // Checks input.
        while (years < 1) {
            System.out.print("Invalid. Enter 1 or greater: ");
            input anotheryears = keyboard.nextInt();
        }
    }

    final int NUM_MONTHS = 12; // Months per year

    System.out.println("Enter the rainfall, in inches, for each month."); //here           
    for (int y = 1; y <= years; y++); //here
       {
         for (int m = 1; m <= NUM_MONTHS; m++); //here
         {
            // Gets rainfall for each month.
            System.out.print("Year " + y + " month " + m + ": "); //here
            monthRain = keyboard.nextDouble(); //here

            // Checks input.
            while (monthRain < 0) //here
            { //here
             System.out.print("Invalid. Enter 0 or greater: "); //here
             monthRain = keyboard.nextDouble(); //here
            }

            // Accumulates rainfall.
            totalRain += monthRain; //here
         } //here
      }
      // Calculates average rainfall.
      average = totalRain / (years * NUM_MONTHS);
      // Displays statistics.
      System.out.println("\nNumber of months: " + (years * NUM_MONTHS)); //here
      System.out.println("Total rainfall: " + totalRain + " inches"); //here
      System.out.println("Average monthly rainfall: " + average + " inches"); //here
}

Answer 1

缩进代码。主要问题在这里:

public static void main(String[] args) {
    double monthRain = 0; 
    //more code...
    while (years < 1) {
        System.out.print("Invalid. Enter 1 or greater: ");
        input anotheryears = keyboard.nextInt();
    }
} //<--- here
//you're closing the main method
//and then you have more code outside of it
final int NUM_MONTHS = 12; // Months per year

System.out.println("Enter the rainfall, in inches, for each month."); //here           
for (int y = 1; y <= years; y++); //here
    //rest of code

除此之外，删除 for 语句后面的分号:

for (int y = 1; y <= years; y++); //<-- remove this

应该是这样的:

for (int y = 1; y <= years; y++) {
    //rest of code...
}