尝试将文本文件读入2D数组并打印到屏幕

Question

我正在尝试从文件中读取数据并加载到二维数组中，然后将其打印到屏幕上，但是输出错误：

输出：

Analysis report of the temperatre reading for the past 10 days 
The code throws an exception
The code throws an exception
The code throws an exception
The code throws an exception
The code throws an exception
The code throws an exception
The code throws an exception
The code throws an exception
The code throws an exception

我创建了一个名为temperature.txt的数据文件。 数据文件以（low）格式包含过去10天的高温和低温。 （高）：

+-------------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+
| 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 |
+-------------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+

这是我的代码如下：

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

public class Temperature {


    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);


            for(int row=0; row<temp.length; row++)
            {
               tokenizer=new StringTokenizer(line, "|");

               if(row != 0)
               {
                   try
                   {

                       if(row % 2 == 0)
                       {
                           sumHigh = Integer.parseInt(tokenizer.nextToken());
                           temp[row][1]=Integer.parseInt(tokenizer.nextToken());

                       }
                       else if (row % 2 != 0) 
                       {

                           sumLow = Integer.parseInt(tokenizer.nextToken());
                           temp[row][0]=Integer.parseInt(tokenizer.nextToken());

                       }
                   }
                   catch(Exception e)
                   {
                       System.out.println("The code throws an exception");
                   }
               }

            }

            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

我将提出将温度解析为一个单独函数的逻辑。 像这样：

public class Temperature {
    public static class MinMax {
        private int min;
        private int max;

        public MinMax(int min, int max) {
            this.min = min;
            this.max = max;
        }

        public int getMin() {
            return this.min;
        }

        public int getMax() {
            return this.max;
        }
    }

    private static List<MinMax> getTemperatures(String line) {
        List<MinMax> minMaxList = new ArrayList<>(10);

        StringTokenizer tokenizer = new StringTokenizer(line, "|");
        System.out.println(tokenizer.nextToken().trim());  //prints out Temperature
        while(tokenizer.hasMoreTokens()) {
            int minimum = Integer.valueOf(tokenizer.nextToken().trim());
            int maximum = Integer.valueOf(tokenizer.nextToken().trim());
            minMaxList.add(new MinMax(minimum, maximum));
            System.out.println("Day " + (minMaxList.size()) + ": Minimum: " + minimum + " Maximum: " + maximum);
        }

        return minMaxList;
    }

    public static void main(String[] args) {
        getTemperatures("| Temperature | 30|32 | 29|30 | 25|28 | 25|29 | 27|31 | 28|32 | 26|30 | 24|32 | 24|41 | 27|32 |");
    }
}

我不确定您是如何将温度存储在2d数组中的，所以为它创建了一个专用类并返回列表中的所有内容。 然后，您可以根据需要将此列表放入数组结构中。

还要注意，我使用trim()删除了数字周围的空格。 这样可以防止您获取NumberFormatException。