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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.         Record[] records = loadRecords();
  11.  
  12.         Arrays.sort(records, new Comparator<Record>() {
  13.             @Override
  14.             public int compare(Record o1, Record o2) {
  15.                 return o1.name.compareTo(o2.name);
  16.             }
  17.         });
  18.         saveRecords("/home/b/Desktop/sortedByName.txt", records);
  19.  
  20.         Arrays.sort(records, new Comparator<Record>() {
  21.             @Override
  22.             public int compare(Record o1, Record o2) {
  23.                 return o1.number.compareTo(o2.number);
  24.             }
  25.         });
  26.         saveRecords("/home/b/Desktop/sortedByNumber.txt", records);
  27.  
  28.         Arrays.sort(records, new Comparator<Record>() {
  29.             @Override
  30.             public int compare(Record o1, Record o2) {
  31.                 return Integer.compare(o1.score, o2.score);
  32.             }
  33.         });
  34.         saveRecords("/home/b/Desktop/sortedByScore.txt", records);
  35.     }
  36.  
  37.     static void saveRecords(String filepath, Record[] records) {
  38.         try {
  39.             try (FileOutputStream fos = new FileOutputStream(filepath)) {
  40.                 try (OutputStreamWriter osw = new OutputStreamWriter(fos)) {
  41.                     try (BufferedWriter bw = new BufferedWriter(osw)) {
  42.                         for (Record record : records) {
  43.                             bw.write(record.name + " " + record.number + " " + record.score);
  44.                             bw.newLine();
  45.                         }
  46.                     }
  47.                 }
  48.             }
  49.         } catch (IOException e) {
  50.             throw new RuntimeException(e);
  51.         }
  52.     }
  53.  
  54.     static Record[] loadRecords() {
  55.         try {
  56.             Record[] records = new Record[20];
  57.             try (FileInputStream fis = new FileInputStream("/home/b/Desktop/data.txt")) {
  58.                 try (InputStreamReader isr = new InputStreamReader(fis)) {
  59.                     try (BufferedReader br = new BufferedReader(isr)) {
  60.                         for (int i = 0; i < 20; i++) {
  61.                             String[] columns = br.readLine().split(" ");
  62.                             records[i] = new Record(columns[0], columns[1], Integer.parseInt(columns[2]));
  63.                         }
  64.                         return records;
  65.                     }
  66.                 }
  67.             }
  68.         } catch (IOException e) {
  69.             throw new RuntimeException(e);
  70.         }
  71.     }
  72. }
  73.  
  74. class Record {
  75.     String name;
  76.     String number;
  77.     int score;
  78.  
  79.     Record(String name, String number, int score) {
  80.         this.name = name;
  81.         this.number = number;
  82.         this.score = score;
  83.     }
  84. }
  85.  
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https://ideone.com/hvZjl1
language:
Java (12.0.1)
created:
11 years ago
visibility:
public

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