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  1. package temp;
  2.  
  3. import java.io.*;
  4. import java.util.Arrays;
  5. import java.util.Comparator;
  6.  
  7. public class Test {
  8.  
  9.     public static void main(String[] args) {
  10.         String[][] records = loadRecords();
  11.  
  12.         Arrays.sort(records, new Comparator<String[]>() {
  13.             @Override
  14.             public int compare(String[] o1, String[] o2) {
  15.                 return o1[0].compareTo(o2[0]);
  16.             }
  17.         });
  18.         saveRecords("/home/b/Desktop/sortedByName.txt", records);
  19.  
  20.         Arrays.sort(records, new Comparator<String[]>() {
  21.             @Override
  22.             public int compare(String[] o1, String[] o2) {
  23.                 return o1[1].compareTo(o2[1]);
  24.             }
  25.         });
  26.         saveRecords("/home/b/Desktop/sortedByNumber.txt", records);
  27.  
  28.         Arrays.sort(records, new Comparator<String[]>() {
  29.             @Override
  30.             public int compare(String[] o1, String[] o2) {
  31.                 int c = Integer.compare(o1[2].length(), o2[2].length());
  32.                 if (c == 0) {
  33.                     c = o1[2].compareTo(o2[2]);
  34.                 }
  35.                 return c;
  36.             }
  37.         });
  38.         saveRecords("/home/b/Desktop/sortedByScore.txt", records);
  39.     }
  40.  
  41.     static void saveRecords(String filepath, String[][] records) {
  42.         try {
  43.             try (FileOutputStream fos = new FileOutputStream(filepath)) {
  44.                 try (OutputStreamWriter osw = new OutputStreamWriter(fos)) {
  45.                     try (BufferedWriter bw = new BufferedWriter(osw)) {
  46.                         for (String[] columns : records) {
  47.                             bw.write(columns[0] + " " + columns[1] + " " + columns[2]);
  48.                             bw.newLine();
  49.                         }
  50.                     }
  51.                 }
  52.             }
  53.         } catch (IOException e) {
  54.             throw new RuntimeException(e);
  55.         }
  56.     }
  57.  
  58.     static String[][] loadRecords() {
  59.         try {
  60.             String[][] records = new String[20][];
  61.             try (FileInputStream fis = new FileInputStream("/home/b/Desktop/data.txt")) {
  62.                 try (InputStreamReader isr = new InputStreamReader(fis)) {
  63.                     try (BufferedReader br = new BufferedReader(isr)) {
  64.                         for (int i = 0; i < 20; i++) {
  65.                             records[i] = br.readLine().split(" ");
  66.                         }
  67.                         return records;
  68.                     }
  69.                 }
  70.             }
  71.         } catch (IOException e) {
  72.             throw new RuntimeException(e);
  73.         }
  74.     }
  75. }
  76.  
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https://ideone.com/c0WkPl
language:
Java (12.0.1)
created:
11 years ago
visibility:
public

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