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  1. package temp;
  2.  
  3. import java.io.*;
  4. import java.util.Arrays;
  5. import java.util.Comparator;
  6. import java.util.HashSet;
  7. import java.util.Random;
  8. import java.util.Scanner;
  9.  
  10. public class Test {
  11.     public static void main(String[] args) {
  12.         createData();
  13.         calcAverage();
  14.     }
  15.  
  16.     static void calcAverage() {
  17.         try {
  18.             int sum = 0;
  19.             int count = 0;
  20.  
  21.             try (FileInputStream fis = new FileInputStream("/home/b/Desktop/data.txt")) {
  22.                 try (InputStreamReader isr = new InputStreamReader(fis)) {
  23.                     try (BufferedReader br = new BufferedReader(isr)) {
  24.                         while (true) {
  25.                             String line = br.readLine();
  26.                             if (line == null) {
  27.                                 break;
  28.                             }
  29.                             String[] columns = line.split(" ");
  30.                             sum += Integer.parseInt(columns[2]);
  31.                             count += 1;
  32.                         }
  33.                     }
  34.                 }
  35.             }
  36.  
  37.             System.out.println("average " + ((double)sum / count));
  38.         } catch (IOException e) {
  39.             throw new RuntimeException(e);
  40.         }
  41.     }
  42.  
  43.     static void createData() {
  44.         String[] familynames = new String[] { "佐藤", "中村", "佐々木", "林", "齋藤", "池田", "小川", "渡邉", "遠藤", "石田", "和田", "山崎", "渡邊", "工藤", "松井", "今井", "木下", "櫻井", "久保", "千葉",
  45.                 "本田", "渡部", "山内", "西田", "高田", "南", "松下", "安田", "菅野", "高野", "石橋", "吉岡", "関", "澤田", "中原", "森本", "岡", "片岡", "中嶋", "上村", "鈴木", "伊藤", "吉田", "木村",
  46.                 "前田", "長谷川", "村上", "藤原", "三浦", "原田", "中川", "金子", "上田", "内田", "小山", "村田", "野口", "大塚", "増田", "平田", "杉本", "水野", "松岡", "菊地", "石原", "島田", "西川",
  47.                 "中田", "永井", "永田", "服部", "大島", "成田", "大山", "岩崎", "山中", "大橋", "浅野", "松永", "小澤", "田中", "小林", "松本", "清水", "山下", "橋本", "後藤", "青木", "近藤", "岡本", "太田",
  48.                 "中野", "中山", "森田", "横山", "野村", "佐野", "平野", "齊藤", "東", "大西", "杉山", "中西", "古川", "辻", "斎藤", "大谷", "樋口", "望月", "土屋", "西山", "馬場", "黒田", "髙橋", "篠原",
  49.                 "宮田", "大石", "松浦", "松村", "須藤", "山本", "山田", "山口", "森", "阿部", "岡田", "藤田", "松田", "小野", "西村", "竹内", "柴田", "宮本", "谷口", "市川", "上野", "武田", "川口", "菅原",
  50.                 "宮崎", "菊池", "小島", "五十嵐", "吉川", "矢野", "高木", "田口", "大久保", "星野", "熊谷", "荒木", "桑原", "松原", "栗原", "白石", "北川", "小田", "青山", "早川", "河合", "高橋", "加藤",
  51.                 "井上", "渡辺", "石川", "中島", "坂本", "石井", "藤井", "田村", "大野", "福田", "原", "酒井", "安藤", "藤本", "松尾", "河野", "丸山", "川上", "北村", "斉藤", "秋山", "新井", "飯田", "野田",
  52.                 "久保田", "小松", "川村", "岩田", "堀", "岩本", "吉村", "福島", "小泉", "上原", "本間", "小池", "鎌田", "吉野", "足立", "片山", "安部", "天野", "中尾", "奥田", "川崎", "神谷", "松山", "前川",
  53.                 "水谷", "金田", "町田", "児玉", "坂田", "岸本", "植田", "森山", "三上", "大川", "森川", "中谷", "堀内", "桜井", "川原", "川端", "谷川", "新田", "米田", "徳永", "岡野", "松島", "落合", "吉澤",
  54.                 "平川", "福永", "榊原", "大木", "田上", "武井", "内藤", "尾崎", "奥村", "宮下", "牧野", "田代", "小笠原", "川島", "高山", "中澤", "横田", "大澤", "岩井", "村井", "坂井", "小倉" };
  55.         String[] givennames = new String[] {"春", "夏", "秋", "冬"};
  56.         Random random = new Random();
  57.         int manCount = 0;
  58.         int womanCount = 0;
  59.  
  60.         HashSet<String> numbers = new HashSet<>();
  61.         try {
  62.             try (FileOutputStream fos = new FileOutputStream("/home/b/Desktop/data.txt")) {
  63.                 try (OutputStreamWriter osw = new OutputStreamWriter(fos)) {
  64.                     try (BufferedWriter bw = new BufferedWriter(osw)) {
  65.                         for (int i = 0; i < 30; i++) {
  66.                             // create name
  67.                             String personalname = familynames[random.nextInt(familynames.length)] + givennames[random.nextInt(givennames.length)];
  68.  
  69.                             if (manCount > 15) {
  70.                                 personalname += "女";
  71.                                 womanCount += 1;
  72.                             } else if (womanCount > 15) {
  73.                                 personalname += "男";
  74.                                 manCount += 1;
  75.                             } else {
  76.                                 if (random.nextBoolean()) {
  77.                                     personalname += "女";
  78.                                     womanCount += 1;
  79.                                 } else {
  80.                                     personalname += "男";
  81.                                     manCount += 1;
  82.                                 }
  83.                             }
  84.  
  85.                             // create number
  86.                             String number = "";
  87.                             do {
  88.                                 for (int j = 0; j < 6; j++) {
  89.                                     number += String.valueOf(random.nextInt(10));
  90.                                 }
  91.                             } while (numbers.contains(number));
  92.                             numbers.add(number);
  93.  
  94.                             // create score
  95.                             int score = random.nextInt(101);
  96.  
  97.                             bw.write(personalname + " " + number + " " + score);
  98.                             bw.newLine();
  99.                         }
  100.                     }
  101.                 }
  102.             }
  103.         } catch (IOException e) {
  104.             throw new RuntimeException(e);
  105.         }        
  106.     }
  107. }
  108.  
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https://ideone.com/FBmvDv
language:
Java (12.0.1)
created:
10 years ago
visibility:
public

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