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StudentBeganTest.java
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279 lines (224 loc) · 7.39 KB
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/*package studnet2;
import java.nio.channels.SelectableChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;
public class StudentBeganTest {
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
ArrayList list = new ArrayList();
nowStudentFunction(list);
System.out.println(list);
functionSelect(list);
// System.out.println(list);
}
private static void nowStudentFunction(ArrayList list) {
Student p1 = new Student("何力", "男", 92.0, 22);
Student p2 = new Student("马灿", "男", 93.0, 24);
Student p3 = new Student("小三", "男", 90.0, 31);
Student p4 = new Student("妹子二号", "女", 86.0, 18);
Student p5 = new Student("木头", "男", 99.0, 21);
Student p6 = new Student("耿青", "男", 95.0, 20);
Student p7 = new Student("妹子一号", "女", 82.0, 19);
Student p8 = new Student("妹子三号", "女", 97.0, 24);
list.add(p1);
list.add(p2);
list.add(p3);
list.add(p4);
list.add(p5);
list.add(p6);
list.add(p7);
list.add(p8);
}
public static void functionSelect(ArrayList list) {
System.out.println("---------------------------");
System.out.println("------有如下几种功能-----------");
System.out.println("------A.增加学生-------------");
System.out.println("------B.删除学生-------------");
System.out.println("------C.修改信息-------------");
System.out.println("------D.查找学生-------------");
System.out.println("------E.通过年龄对学生进行排序---");
System.out.println("------F.通过成绩对学生进行排序---");
System.out.println("------G.按照id展示学生信息-----");
System.out.println("------H.按照性别展示学生信息----");
System.out.println("------I.退出系统-------------");
System.out.println("---------------------------");
while (true) {
String choose = sc.nextLine();
switch (choose) {
case "A":
System.out.println("请输入你要增加学生的信息：");
System.out.print("请输入你的名字： ");
String n = sc.next();
System.out.print("请输入你的性别： ");
String s = sc.next();
System.out.print("请输入你的成绩： ");
double g = sc.nextDouble();
System.out.print("请输入你的年龄： ");
int a = sc.nextInt();
list.add(new Student(n,s,g,a));
functionSelect(list);
break;
case "B":
System.out.println("请输入你要删除学生的id");
int id = sc.nextInt();
list.remove(findId(list, id));
functionSelect(list);
break;
case "C":
System.out.println("请输入你要修改学生的id");
int id2 = sc.nextInt();
int id3 = findId(list, id2);
modiInfo(id3, list);
functionSelect(list);
break;
case "D":
System.out.println("请输入你要查找学生的id");
int id4 = sc.nextInt();
System.out.println(list.get(findId(list, id4)));
functionSelect(list);
break;
case "E":
selectSort(list);
functionSelect(list);
break;
case "F":
bubbleSort(list);;
functionSelect(list);
break;
case "G":
idShow(list);
functionSelect(list);
break;
case "H":
System.out.println("请输入性别：");
String sextoo = sc.nextLine();
sexShow(list, sextoo);
functionSelect(list);
case "I":
System.out.println("你已退出学生管理系统");
System.exit(0);
}
}
}
public static void modiInfo(int index,ArrayList list) {
int flag = 1;
while (true) {
System.out.println("该学生的信息如下");
System.out.println("姓名： " + ((Student) list.get(index)).getName());
System.out.println("性别： " + ((Student) list.get(index)).getSex());
System.out.println("成绩： " + ((Student) list.get(index)).getGrade());
System.out.println("年龄： " + ((Student) 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();
((Student) list.get(index)).setName(newName);
break;
case 2:
System.out.println("请输入你修改的性别");
String newSex = sc.next();
((Student) 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();
((Student) 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();
((Student) list.get(index)).setAge(newAge);
break;
case 5:
flag = 0;
break;
}
}
}
public static int findId(ArrayList list,int id) {
int index = -1;
for (int i = 0; i < list.size(); i++) {
if (((Student)list.get(i)).getId() == id ) {
index = i;
}
}
return index;
}
// 选择排序 按照年龄排序
public static void selectSort(ArrayList list) {
//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 list2 = new ArrayList();
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 (((Student) list2.get(index)).getAge() > ((Student) list2.get(j)).getAge()) {
index = j;// 记录最小值的下标
} // if
} // for
if (index != i) {
Student temp = (Student) list2.get(index);
list2.set(index, list2.get(i));
list2.set(i, temp);
}
}
// 遍历
for (int i = 0; i < list2.size(); i++) {
System.out.println(" 学生Id " + ((Student) list2.get(i)).getId() + " 学生姓名： " + ((Student) list2.get(i)).getName() + " 年龄： " + ((Student) list2.get(i)).getAge()
+ " 性别： " + ((Student) list2.get(i)).getSex() + " 成绩： " + ((Student) list2.get(i)).getGrade());
}
for (Object object : list2) {
System.out.println(object.toString());
}
}
// 冒泡排序 按照成绩排序
public static void bubbleSort(ArrayList list) {
//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 list2 = new ArrayList();
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 (((Student) list2.get(j)).getGrade() < ((Student) list2.get(j + 1)).getGrade()) {
Student temp = ((Student) 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 (Object object : list2) {
System.out.println(object.toString());
}
}
// 按照ID展示
public static void idShow(ArrayList list) {
// 遍历
for (int i = 0; i < list.size(); i++) {
System.out.println(" 学生Id " + ((Student) list.get(i)).getId() + " 学生姓名： " + ((Student) list.get(i)).getName() + " 年龄： "
+ ((Student) list.get(i)).getAge() + " 性别： " + ((Student) list.get(i)).getSex() + " 成绩： "
+ ((Student) list.get(i)).getGrade());
}
}
// 2选择性别展示
public static void sexShow(ArrayList list, String sex) {
ArrayList list2 = new ArrayList();
list2.addAll(list);
for (int i = 0; i < list2.size(); i++) {
if (sex.equals(((Student) list2.get(i)).getSex())) {
System.out.println(" 学生Id " + ((Student) list2.get(i)).getId() + " 学生姓名： " + ((Student) list2.get(i)).getName() + " 年龄： "
+ ((Student) list2.get(i)).getAge() + " 性别： " + ((Student) list2.get(i)).getSex() + " 成绩： "
+ ((Student) list2.get(i)).getGrade());
}
}
}
}
*/