package cn.tedu.sms;
import java.util.Scanner;
import java.util.*;
public class Operator {
//需要一个集合，来保存多个Student对象。
Student[] db = new Student[0];
Scanner scan = new Scanner(System.in);
//显示所有学生信息
public void showAll(){
for(int i = 0; i < db.length; i++){
Student s = db[i];
System.out.println(s.sno + "\t" + s.name + "\t" + s.age);
}
}
//根据学生学号，查询指定学生信息
public void findById(){
System.out.println("请输入您要查询的学生学号: ");
int sno = scan.nextInt();
int index = -1;
for(int i = 0; i < db.length; i++){
Student s = db[i];
if(s.sno == sno){
index = i;
break;
}
}
if(index != -1){
System.out.println(db[index].sno + "\t" + db[index].name + "\t" + db[index].age);
}else{
System.out.println("您查询的学号为" + sno + "的学生不存在.");
}
}
//添加学生信息
//每个学生学号不能相同。
public void add(){
System.out.println("请输入学生学号: ");
int sno = scan.nextInt();
//判断是否有学号重复，如果有，提示用户学号重复，并让用户重新输入学号
System.out.println("请输入学生姓名: ");
String name = scan.next();
System.out.println("请输入学生年龄: ");
int age = scan.nextInt();
Student stu = new Student();
stu.sno = sno;
stu.name = name;
stu.age = age;
db = (Student[]) Arrays.copyOf(db, db.length + 1);
db[db.length - 1] = stu;
System.out.println("学生信息添加成功");
}
//根据学生学号，修改指定学生信息
public void updateById(){
System.out.println("请输入您要修改的学生学号: ");
int sno = scan.nextInt();
int index = -1;
for(int i = 0; i < db.length; i++){
Student s = db[i];
if(s.sno == sno){
index = i;
break;
}
}
if(index != -1){
System.out.println("学号为" + sno + "学生原姓名为" + db[index].name + "请输入您修改后的学生姓名: ");
String name = scan.next();
System.out.println("学号为" + sno + "学生原年龄为" + db[index].age + "请输入您要修改的学生年龄： ");
int age = scan.nextInt();
db[index].name = name;
db[index].age = age;
System.out.println("修改成功!");
}else{
System.out.println("您要修改的学号为" + sno + "的学生不存在.");
}
}
//删除所有学生信息
public void deleteAll(){
db = new Student[0];
System.out.println("全部删除成功!");
}
//根据学号删除指定学生id
public void deleteById(){
System.out.println("请输入您要删除的学生学号: ");
int sno = scan.nextInt();
int index = -1;
for(int i = 0; i < db.length; i++){
Student s = db[i];
if(s.sno == sno){
index = i;
break;
}
}
if(index != -1){
Student[] newdb = new Student[db.length - 1];
for(int i = 0; i < index; i++){
newdb[i] = db[i];
}
for(int i = index; i < db.length - 1; i++){
newdb[i] = db[i + 1];
}
db = newdb;
System.out.println("删除成功！！！！！！");
}else{
System.out.println("您要删除的学号为" + sno + "的学生不存在.");
}
}
}
sms.zip_学生系统
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2022-09-23
18:11:45
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sms.zip （10个子文件） 
sms bin cn tedu sms 
Operator.class 3KB UI.class 2KB Student.class 338B Application.class 497B src cn tedu sms Operator.java 3KB Student.java 88B UI.java 1KB Application.java 202B .project 379B .classpath 232B资源评论
