利用順序表完成一個學生成績管理系統

  1 //利用順序表完成一個學生成績管理系統
  2 package classwork_5;
  3 
  4 public class student {
  5        private String name;//名字
  6        private int id;//學號
  7        private String state;//是否在籍
  8        private double gpa;//在校績點成績       
  9     public student() {
 10         
 11     }
 12     public student(String name, int id, String state, double gpa) {
 13         this.name = name;
 14         this.id = id;
 15         this.state = state;
 16         this.gpa = gpa;
 17     }
 18     public String getName() {
 19         return name;
 20     }
 21     public void setName(String name) {
 22         this.name = name;
 23     }
 24     public int getId() {
 25         return id;
 26     }
 27     public void setId(int id) {
 28         this.id = id;
 29     }
 30     public String getState() {
 31         return state;
 32     }
 33     public void setState(String state) {
 34         this.state = state;
 35     }
 36     public double getGpa() {
 37         return gpa;
 38     }
 39     public void setGpa(double d) {
 40         this.gpa = d;
 41     }
 42     @Override
 43     public String toString() {
 44         return "" + name + "\t\t" + id + "\t\t" + state + "\t\t" + gpa;
 45     }
 46        
 47 }
 48 
 49 
 50 package classwork9;
 51 
 52 import java.util.ArrayList;
 53 import java.util.List;
 54 import java.util.Scanner;
 55 
 56 import classwork_5.student;
 57 
 58 public class stumanager {
 59     private Scanner in = new Scanner(System.in);
 60     private List<student> stu = new ArrayList<student>();
 61 
 62     // 初始化,先往學生管理系統裏面存入一些學生信息
 63     public void init() {
 64         student s1 = new student("小明", 2019216588, "在籍", 4.4);
 65         student s2 = new student("小紅", 2019219888, "在籍", 1.2);
 66         student s3 = new student("小剛", 2019212188, "在籍", 3.4);
 67         stu.add(s1);
 68         stu.add(s2);
 69         stu.add(s3);
 70     }
 71 
 72     public void menu() {
 73         System.out.println("*******歡迎使用學生管理系統*******");
 74         System.out.println("請根據提示選擇");
 75         System.out.println("1.添加學生信息");
 76         System.out.println("2.刪除學生信息");
 77         System.out.println("3.修改學生信息");
 78         System.out.println("4.查詢學生並輸出");
 79         System.out.println("5.全部學生信息");
 80 
 81         int choice = in.nextInt();
 82         switch (choice) {
 83         case 1:
 84             addstu();
 85             break;
 86         case 2:
 87             delstu();
 88             break;
 89         case 3:
 90              amendstu();
 91             break;
 92         case 4:
 93              findstu();
 94             break;
 95         case 5:
 96             show();
 97             break;
 98         default:
 99         }
100     }
101 
102     public void iscontinuemenu() {
103         System.out.println("是否返回到主菜單(y/n)");
104         String iscon = in.next();
105         if ("y".equals(iscon)) {
106             menu();
107         }
108     }
109 
110     private void addstu() {
111         System.out.println("增長學生信息");
112         System.out.println("請輸入學生名");
113         String name = in.next();
114         System.out.println("請輸入學生學號");
115         int id = in.nextInt();
116         System.out.println("請輸入學生的入學年份");
117         int year = in.nextInt();
118         String y = "";
119         if (year <= 2020 && year >= 2017) {
120             y = "在籍";
121         } else {
122             y = "不在籍";
123         }
124         System.out.println("請輸入學生績點");
125         double gpa = in.nextDouble();
126         student st = new student(name, id, y, gpa);
127         stu.add(st);
128         System.out.println("已添加完畢請返回主菜單查看");
129         iscontinuemenu();
130     }
131 
132     // 刪除學生信息,根據學號刪除
133     private void delstu() {
134         System.out.println("請輸入要刪除的學號");
135         int a = in.nextInt();
136         for (int loop = 0; loop < stu.size(); loop++) {
137             if (((student) stu.get(loop)).getId() == a) {
138                 stu.remove(loop);
139                 System.out.println("刪除成功！");
140                 break;
141             }
142         }
143 
144         System.out.println("已刪除完畢請返回主菜單查看");
145         iscontinuemenu();
146     }
147 
148     // 修改學生信息amend
149 
150     private void amendstu() {
151         System.out.println("請輸入要修改學生信息的學號");
152         int a = in.nextInt();
153         int loop;
154         for (loop = 0; loop < stu.size(); loop++) {
155             if (((student) stu.get(loop)).getId() == a) {
156                 break;
157             }
158         }
159 
160         System.out.println("請輸入新名字,學號,績點");
161         String name1 = in.next();
162         int id = in.nextInt();
163         double gpa = in.nextDouble();
164         ((student) stu.get(loop)).setName(name1);
165         ((student) stu.get(loop)).setId(id);
166         ((student) stu.get(loop)).setGpa(gpa);
167         System.out.println("已修改完畢請返回主菜單查看");
168         iscontinuemenu();
169     }
170 
171     // 查詢學生信息,根據學號查詢
172     private void findstu() {
173         System.out.println("請輸入要查詢學生的學號");
174 
175         int a = in.nextInt();
176         int loop;
177         for (loop = 0; loop < stu.size(); loop++) {
178             if (((student) stu.get(loop)).getId() == a) {
179                 System.out.println(((student) stu.get(loop)));
180                 break;
181             }
182         }
183         iscontinuemenu();
184 
185     }
186 
187     // 查看全部學生信息
188     private void show() {
189         System.out.println("姓名\t\t學號\t\t\t在籍狀態\t\t在校成績");
190 
191         for (student x : stu) {
192             System.out.print(x + " ");
193             System.out.println();
194         }
195         iscontinuemenu();
196     }
197 
198 }
199 
200 package classwork9;
201 
202 public class stuman_test {
203 
204     public static void main(String[] args) {
205         stumanager a=new stumanager();
206            a.init();
207            a.menu();
208 
209     }
210 
211 }