-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathStudentManagement.java
More file actions
271 lines (216 loc) · 5.78 KB
/
Copy pathStudentManagement.java
File metadata and controls
271 lines (216 loc) · 5.78 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
package studnet2;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
import javax.swing.JSpinner.ListEditor;
// 学生管理
class StudentManagement {
private String name;
private static StudentManagement s = null;// 保存地址
ArrayList<Student> list;
private StudentManagement(String name) {
this.name = name;
list = new ArrayList<Student>();
}
public String getName() {
return name;
}
public static StudentManagement getInstance(String name) {
if (s == null) {
s = new StudentManagement(name);
}
return s;
}
/*
* 增加学生
*/
public void addStudent(Student s) throws TheObjectIsNullException {
if (s == null) {
throw new TheObjectIsNullException("对象不能为空");
}
list.add(s);
}
/*
* 通过ID删除学生
*/
public void deleteStudent(int id) throws TheIdIdNullException {
if (id <= 0 || id > list.size()) {
throw new TheIdIdNullException("这个删除的id不合法");
}
int index = findStudent(id);
if (index != -1) {
list.remove(index);
} else {
System.out.println("删除失败");
}
}
/*
* 通过ID查找学生
*/
public int findStudent(int id) throws TheIdIdNullException {
if (id <= 0 || id > list.size()) {
throw new TheIdIdNullException("这个查找的id不合法");
}
int index = -1;
for (int i = 0; i < list.size(); i++) {
if (this.list.get(i).getId() == id) {
index = i;
}
}
return index;
}
// 展示查找id的学生信息
public void findStudentInfo(int id) throws TheIdIdNullException {
if (id <= 0 || id > list.size()) {
throw new TheIdIdNullException("这个查找的id不合法");
}
int index = findStudent(id);
if (index != -1) {
System.out.println("该名学生的信息如下");
System.out.println(list.get(index));
} else {
System.out.println("没有这个学生");
}
}
/*
* 通过Id修改学生的信息
*/
public void alterStudent(int id) throws TheIdIdNullException {
if (id <= 0 || id > list.size()) {
throw new TheIdIdNullException("这个查找的id不合法");
}
int index = findStudent(id);
if (index != -1) {
Scanner sc = new Scanner(System.in);
int flag = 1;
while (true) {
System.out.println("该学生的信息如下");
System.out.println("姓名： " + list.get(index).getName());
System.out.println("性别： " + list.get(index).getSex());
System.out.println("成绩： " + list.get(index).getGrade());
System.out.println("年龄： " + list.get(index).getAge());
System.out.println("请输入你想修改的信息：1.姓名; 2.性别; 3. 成绩; 4.年龄; 5.退出");
int select = sc.nextInt();
switch (select) {
case 1:
System.out.println("请输入你想修改的名字");
String newName = sc.next();
this.list.get(index).setName(newName);
break;
case 2:
System.out.println("请输入你修改的性别");
String newSex = sc.next();
this.list.get(index).setSex(newSex);
break;
case 3:
System.out.println("请输入你的正确的成绩");
double newGrade = sc.nextDouble();
this.list.get(index).setGrade(newGrade);
break;
case 4:
System.out.println("请输入你的正确的年龄");
int newAge = sc.nextInt();
this.list.get(index).setAge(newAge);
break;
case 5:
flag = 0;
break;
}
if (flag == 0) {
break;
}
}
} else {
System.out.println("没有这个学生");
}
}
// 选择排序 按照年龄排序
public void selectSort() {
// 为了不影响id的绑定，所以需要新建一个新的数组将旧的数组赋值给新的数组，然后展示新的数组
ArrayList<Student> list2 = new ArrayList<Student>();
list2.addAll(list);
for (int i = 0; i < list2.size() - 1; i++) {
int index = i;
for (int j = i + 1; j < list2.size(); j++) {
if (new AgeComparator().compare(list2.get(index), list2.get(j)) > 0) {
index = j;// 记录最小值的下标
} // if
} // for
if (index != i) {
Student temp = list2.get(index);
list2.set(index, list2.get(i));
list2.set(i, temp) ;
}
}
// 遍历
for (Student student : list2) {
System.out.println(student);
}
}
// 冒泡排序 按照成绩排序
public void bubbleSort() {
ArrayList<Student> list2 = new ArrayList<Student>();
list2.addAll(list);
int flag = 1;
for (int i = 0; i < list2.size() - 1; i++) {
for (int j = 0; j < list2.size() - 1 - i; j++) {
if ((new GradeCpmparator().compare(list2.get(j), list2.get(j + 1))) > 0) {
Student temp = list2.get(j);
list2.set(j, list2.get(j + 1));
list2.set(j + 1, temp);
flag = 0;
}
} // for
if (flag == 1) {
break;
}
flag = 1;
} // for
// 遍历
/*for (int i = 0; i < count; i++) {
System.out.println(" 学生Id " + stu[i].getId() + " 学生姓名： " + stu[i].getName() + " 年龄： " + stu[i].getAge()
+ " 性别： " + stu[i].getSex() + " 成绩： " + stu[i].getGrade());
}*/
for (Student student : list2) {
System.out.println(student);
}
}
/*
* 展示学生 1.按照ID展示 2.选择性别展示
*/
// 按照ID展示
public void idShow() {
// 遍历
for (int i = 0; i < list.size(); i++) {
System.out.println(" 学生Id " + list.get(i).getId() + " 学生姓名： " + list.get(i).getName() + " 年龄： "
+ this.list.get(i).getAge() + " 性别： " + this.list.get(i).getSex() + " 成绩： "
+ this.list.get(i).getGrade());
}
}
// 2选择性别展示
public void sexShow(String sex) {
ArrayList<Student> list2 = new ArrayList<Student>();
list2.addAll(list);
for (int i = 0; i < list2.size(); i++) {
if (sex.equals(list2.get(i).getSex())) {
System.out.println(list2.get(i));
}
}
}
}
//年龄比较器
class AgeComparator implements Comparator<Student> {
@Override
public int compare(Student o1, Student o2) {
return o1.getAge() - o2.getAge();
};
}
//成绩比较器
class GradeCpmparator implements Comparator<Student> {
@Override
public int compare(Student o1, Student o2) {
// TODO Auto-generated method stub
return (int)(o1.getGrade() - o2.getGrade());
}
}