Question

我正在Netbeans中构建一个java项目。我得到了包含格式（低）|（高）格式的高温和低温的数据文件（temperature.txt）。文件应加载到二维数组中，然后将其打印到屏幕上。但是当我运行我的java项目时，我遇到了这个错误并且完全丢失了。但我不知道如何解决这个问题。

Temperature.text：

+-------------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+
| Day         | 1     |  2    |  3    |   4   |   5   |   6   |   7   |   8   |   9   |  10   |
+-------------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+
| Temperature | 30|32 | 29|30 | 25|28 | 25|29 | 27|31 | 28|32 | 26|30 | 24|32 | 24|41 | 27|32 |
+-------------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+

输出：

Analysis report of the temperature reading for the past 10 days 

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
    at Lab4Ex2.main(Lab4Ex2.java:48)
C:\Users\User\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 0 seconds)

这是我的代码：

import java.util.StringTokenizer;
import java.io.*;

public class Exercise {

    public static void main(String[] args) {

        StringTokenizer tokenizer;
        String line;
        String file="temperature.txt";
        int[][] temp=new int[10][2];
        int sumHigh, sumLow;
        FileReader fr=null;
        BufferedReader br=null;

        try
        {
            fr=new FileReader(file);
            br=new BufferedReader(fr);

            line=br.readLine();
            System.out.println("Analysis report of the temperature reading for the past 10 days " + line);

            String [] content=line.split("|");

            for(int row=0; row<=content.length; row++)
            {
               //I am trying to parse the two token into integer..

               if(row != 0)
               {
                   try
                   {
                       //Parse first token into integer and store in current row column 0
                       if(row % 2 != 0) 
                       {
                           sumLow = Integer.parseInt(content[row]);
                           temp[row][0]=Integer.parseInt(content[row]); <---Line 48

                       }
                       //Parse second token into integer and store in current row column 0
                       else if (row % 2 == 0) 
                       {
                           sumHigh = Integer.parseInt(content[row]);
                           temp[row][1]=Integer.parseInt(content[row]); 
                       }
                   }
                   catch(NumberFormatException e)
                   {
                       System.out.println("The code throws an exception");
                   }
               }
               System.out.println();

            }
            br.close();
        }

        catch(FileNotFoundException e)
        {
            System.out.println("The file " + file + " was not found");
        }
        catch(IOException e)
        {
            System.out.println("Reading error");
        }
        catch(NumberFormatException e)
        {
            System.out.println("Parsing error");
        }
        finally
        {
            if(fr != null)
            {
                try
                {
                    fr.close();
                }
                catch(IOException e)
                {
                    System.out.println("Reading error");
                }
            }
        }


    }

}

Answer 1

我不知道您是否已经问过这个问题，但这是一个可行的解决方案供您试用。您似乎正在努力的关键点是文件中只有一行实际上有您想要读取的数据。我使用以下正则表达式分割这一行：

line.split(" \\| ?")

这为我们留下了28|32形式的字符串。这些高/低对中的每一对都可以使用管道再次拆分（但要小心，您需要逃离管道，即\\|）。最后，数据可以存储到您的数组中，并在最后作为完整性检查输出。

public static void main(String[] args) {
    String line;
    String file = "temperature.txt";
    int[][] temp = new int[10][2];
    FileReader fr = null;
    BufferedReader br = null;

    try
    {
        fr = new FileReader(file);
        br = new BufferedReader(fr);

        // eat the first three lines, as they don't contain data you want to use
        br.readLine();
        br.readLine();
        br.readLine();
        line = br.readLine();
        System.out.println("Analysis report of the temperature reading for the past 10 days " + line);

        String [] content=line.split(" \\| ?");
        for (int i=1; i < content.length; ++i) {
            String[] pair = content[i].split("\\|");
            temp[i-1][0] = Integer.parseInt(pair[0]);
            temp[i-1][1] = Integer.parseInt(pair[1]);
        }
        System.out.println(Arrays.deepToString(temp));

    }
    catch (Exception e) {
        System.out.println("An exception occurred.");
    }
}

线程“main”中的异常java.lang.ArrayIndexOutOfBoundsException：1

1 个答案: