设计一个学生管理系统
学生管理系统：添加、显示、查询、修改等功能；
import java.util.Scanner;
/**
* 设计一个：学生管理系统
* 1.添加学生信息\n 2.显示学生信息\n 3.删除学生信息\n 4.修改学生信息\n5.查看学生信息\n 6.排序\n7.退出
*
*/
public class Manage {
// 主模块；
public static void main(String[] args) {
Integer[] studentId = new Integer[100];
Integer[] studentScore = new Integer[100];
String[] studentName = new String[100];
int number = 0;
Integer studentCount = 0;
int time = 0;
System.out.println("欢迎进入学生管理系统\n1.添加学生信息\n2.显示学生信息\n" +
"3.删除学生信息\n4.修改学生信息\n5.查询学生信息\n6.排序\n7.退出");
while (true) {
System.out.println("请输入选择：");
Scanner scanner = new Scanner(System.in);
number = scanner.nextInt();
switch (number) {
case 1:
//添加学生信息
studentCount = add(studentId, studentName, studentScore,studentCount);
System.out.println("添加成功");
break;
case 2:
//显示学生信息
display(studentId, studentName, studentScore, studentCount);
break;
case 3:
//删除学生信息
studentCount = delete(studentId, studentName, studentScore,
studentCount);
break;
case 4:
//修改学生信息
update(studentId, studentName, studentScore, studentCount);
break;
case 5:
//查询学生信息
select(studentId, studentName, studentScore, studentCount);
break;
case 6:
//排序
Sort(studentId, studentName, studentScore, studentCount);
break;
case 7:
//退出
System.exit(0);
break;
default:
System.out.println("请重新输入1-7之间的整数");
}
}
}
// 1.添加学生信息块
public static Integer add(Integer[] studentId, String[] studentName,
Integer[] studentScore, int studentCount) {
System.out.println("请输入学生学号");
Scanner s1 = new Scanner(System.in);
studentId[studentCount] = s1.nextInt();
System.out.println("请输入学生姓名");
Scanner s2 = new Scanner(System.in);
studentName[studentCount] = s2.next();
System.out.println("请输入学生成绩");
Scanner s3 = new Scanner(System.in);
studentScore[studentCount] = s3.nextInt();
studentCount++;
return studentCount;
}
// 2.显示学生信息块
public static void display(Integer[] studentId, String[] studentName,Integer[] studentScore, int studentCount) {
String str = "学号"+"\t姓名"+"\t成绩\n";
for(int i = 0; i < studentCount; i++){
str = studentId[i] + "\t" + studentName[i] + "\t"
+ studentScore[i] + "\n";
}
}
// 3.删除学生信息
public static int delete(Integer[] studentId, String[] studentName,Integer[] studentScore, int studentCount) {
Integer temp = select(studentId,studentName,studentScore,studentCount);
System.out.println("是否确定要删除此条信息。是：选1；否：选0");
Scanner s = new Scanner(System.in);
int j = s.nextInt();
switch(j){
case 0:
System.out.println("你已取消了删除操作");
break;
case 1:
for(int i=0;i<studentCount;i++){
if(studentName.equals(studentName[i])){
if(i<studentCount-1){
studentId[i] = studentId[i+1];
studentName[i] = studentName[i+1];
studentScore[i] = studentScore[i+1];
}
studentId[i] = null;
studentName[i] = null;
studentScore[i] = null;
return studentCount--;
}
}
}
return studentCount;
}
// 4.修改学生信息块
public static void update(Integer[] studentId, String[] studentName,Integer[] studentScore, int studentCount) {
Integer temp = select(studentId, studentName, studentScore, studentCount);
if(temp == null){
System.out.println("你输入的信息有误，请重新输入");
}else{
System.out.println("请重新输入学号");
Scanner s1 = new Scanner(System.in);
studentId[temp] = s1.nextInt();
System.out.println("请重新输入姓名");
Scanner s2 = new Scanner(System.in);
studentName[temp] = s2.next();
System.out.println("请重新输入分数");
Scanner s3 = new Scanner(System.in);
studentScore[temp] = s3.nextInt();
System.out.println("修改完成");
}
}
// 5.查询学生信息块
public static Integer select(Integer[] studentId, String[] studentName,Integer[] studentScore, int studentCount) {
System.out.println("请输入学生姓名");
Scanner s = new Scanner(System.in);
String str = s.next();
for (int i = 0; i < studentCount; i++) {
if (str.equals(studentName[i]))
System.out.println("学号"+"\t姓名"+"\t成绩");
System.out.println(studentId[i] + "\t" + studentName[i] + "\t"
+ studentScore[i]);
return studentId[i];
}
return null;
}
// 6.排序块
public static void Sort(Integer[] studentId, String[] studentName,Integer[] studentScore, int studentCount) {
System.out.println("请选择排序方法:1.按学号排序\t2.按成绩排序");
Scanner s1 = new Scanner(System.in);
int number = s1.nextInt();
switch (number) {
case 1:
for (int i = 0; i < studentCount; i++) {
for (int j = 0; j < studentCount - 1 - i; j++) {
if (studentId[j] > studentId[j + 1]) {
int tp = studentId[j];
studentId[j] = studentId[j + 1];
studentId[j + 1] = tp;
tp = studentScore[j];
studentScore[j] = studentScore[j + 1];
studentScore[j + 1] = tp;
String tp1 = studentName[j];
studentName[j] = studentName[j + 1];
studentName[j + 1] = tp1;
}
}
}
display(studentId, studentName, studentScore, studentCount);
break;
case 2:
for (int i = 0; i < studentCount; i++) {
for (int j = 0; j < studentCount - 1 - i; j++) {
if (studentScore[j] > studentScore[j + 1]) {
int tp = studentScore[j];
studentScore[j] = studentScore[j + 1];
studentScore[j + 1] = tp;
tp = studentId[j];
studentId[j] = studentId[j + 1];
studentId[j + 1] = tp;
String tp1 = studentName[j];
studentName[j] = studentName[j + 1];
studentName[j + 1] = tp1;
}
}
}
display(studentId, studentName, studentScore, studentCount);
break;
default:
System.out.println("请输入1或者2");
}
}
}