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  1. import java.util.*;
  2.  
  3. class Gender {
  4.     private int id;
  5.     public Gender(int id) {
  6.         this.id = id;
  7.     }
  8.     @Override public String toString() {
  9.         switch(id) {
  10.             case 0: return "女子";
  11.             case 1: return "男子";
  12.             default: throw new IllegalArgumentException();
  13.         }
  14.     }
  15. }
  16.  
  17. class Student {
  18.     private int id;
  19.     private String name;
  20.     private Gender gender;
  21.     private int nlang;
  22.     private int math;
  23.     private int eng;
  24.     public Student(int id, String name, Gender gender, int... subs) {
  25.         this.id = id;
  26.         this.name = name;
  27.         this.gender = gender;
  28.         this.nlang = subs[0];
  29.         this.math = subs[1];
  30.         this.eng = subs[2];
  31.     }
  32.     public int getSum() { return nlang + math + eng; }
  33.     public String getAve() { return String.format("%.1f", getSum() / 3.); }
  34.     public String getAward() {
  35.         int sum = getSum();
  36.         if(sum == 300) { return "S"; }
  37.         else if(270 <= sum && sum <= 299) { return "A"; }
  38.         else if(240 <= sum && sum <= 269) { return "B"; }
  39.         else if(180 <= sum && sum <= 239) { return "C"; }
  40.         else { return "不合格"; }
  41.     }
  42.     @Override public String toString() {
  43.         return id + "\t" + name + "\t" + gender + "\t" + nlang + "\t" + math + "\t" + eng + "\t" + getAve() + "\t" + getSum() + "\t" + getAward();
  44.     }
  45. }
  46.  
  47. public class Main {
  48.     private Scanner sc;
  49.     private String[] subjects = { "国語", "数学", "英語" };
  50.     private List<Student> students;
  51.  
  52.     public Main() {
  53.         this.sc = new Scanner(System.in);
  54.         this.students = new ArrayList<Student>();
  55.     }
  56.  
  57.     private void doIt() {
  58.         System.out.printf("人数を自然数で入力してください: ");
  59.         int n = sc.nextInt();
  60.         System.out.printf("\n");
  61.         for(int i=0; i<n; i++) {
  62.             Gender gender = null;
  63.             String name = null;
  64.             int[] subs = { 0, 0, 0 };
  65.             System.out.printf("%d人目の名前を入力してください: ", (i+1));
  66.             name = sc.next();
  67.             System.out.printf("%d人目の性別を入力してください(0 女子, 1 男子): ", (i+1));
  68.             gender = new Gender(sc.nextInt());
  69.             for(int j=0; j<subjects.length; j++) {
  70.                 System.out.printf("%d人目の%sの成績を入力してください: ", (i+1), subjects[j]);
  71.                 subs[j] = sc.nextInt();
  72.             }
  73.             Student student = new Student(i+1, name, gender, subs);
  74.             students.add(student);
  75.             System.out.printf("\n");
  76.         }
  77.         System.out.printf("番号\t名前\t性別\t国語\t数学\t英語\t平均\t総合点\t判定\n");
  78.         System.out.printf("--------------------------------------------------------------------------\n");
  79.         for(Student s : students) {
  80.             System.out.printf(s + "\n");
  81.         }
  82.         System.out.printf("--------------------------------------------------------------------------\n");
  83.     }
  84.  
  85.     public static void main(String[] args) { new Main().doIt(); }
  86. }
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https://ideone.com/Yd2ntE
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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