学生管理系统(练习)
package com.itheima_02.studentsystem;
public class Student {
private String sid;//学号
private String name;//姓名
private String age;//年龄
private String address;//居住地
public Student() {
}
public Student(String sid, String name, String age, String address) {
this.sid = sid;
this.name = name;
this.age = age;
this.address = address;
}
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
package com.itheima_02.studentsystem;
import java.util.ArrayList;
import java.util.Scanner;
public class StudentManager {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
boolean flag = false;
ArrayList<Student> list = new ArrayList<Student>();
while (true) {
System.out.println("----------欢迎来到学生管理系统----------");
System.out.println("1 添加学生");
System.out.println("2 删除学生");
System.out.println("3 修改学生");
System.out.println("4 查看所有学生");
System.out.println("5 退出");
System.out.println("请输入你的选择:");
String x = sc.nextLine();
switch (x) {
case "1":
addStudent(list);
break;
case "2":
deleteStudent(list);
break;
case "3":
updateStudent(list);
break;
case "4":
findAllStudent(list);
break;
case "5":
System.out.println("谢谢使用!欢迎下次光临!");
System.exit(0);
// flag = true;
break;
default:
System.out.println("请输入正确指令!");
break;
}
// if (flag){
// System.out.println("谢谢使用!欢迎下次光临!");
// break;
// }
}
// sc.close();
}
//添加学生信息
public static void addStudent(ArrayList<Student> list) {
Scanner sc = new Scanner(System.in);
String sid;
while (true) {
System.out.println("请输入学生学号:");
sid = sc.nextLine();
if (compare(list, sid)) {
System.out.println("你输入的学号已被占用,请重新输入!");
} else {
break;
}
}
System.out.println("请输入学生姓名:");
String name = sc.nextLine();
System.out.println("请输入学生年龄:");
String age = sc.nextLine();
System.out.println("请输入学生居住地:");
String address = sc.nextLine();
Student s = new Student();
s.setSid(sid);
s.setName(name);
s.setAge(age);
s.setAddress(address);
list.add(s);
System.out.println("添加学生成功!");
}
//查看学生信息
public static void findAllStudent(ArrayList<Student> list) {
if (list.size() == 0) {
System.out.println("无信息!请添加信息再查询!");
return;
}
System.out.println("学号\t\t\t姓名\t\t年龄\t\t居住地\t\t");
for (int i = 0; i < list.size(); i++) {
Student s = list.get(i);
System.out.println(s.getSid() + "\t"
+ s.getName() + "\t\t"
+ s.getAge() + "岁\t"
+ s.getAddress());
}
}
//删除学生信息
public static void deleteStudent(ArrayList<Student> list) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入你要删除的学生学号:");
String sid = sc.nextLine();
boolean index = true;
for (int i = 0; i < list.size(); i++) {
if (list.get(i).getSid().equals(sid)) {
list.remove(i);
index = false;
break;
}
}
if (index) {
System.out.println("该信息不存在,请重新输入!");
} else {
System.out.println("删除学生成功!");
}
}
//修改学生信息
public static void updateStudent(ArrayList<Student> list) {
Scanner sc = new Scanner(System.in);
boolean index = true;
System.out.println("请输入你要修改的学生学号:");
String sid = sc.nextLine();
int i;
for (i = 0; i < list.size(); i++) {
if (list.get(i).getSid().equals(sid)) {
index = false;
break;
}
}
if (index) {
System.out.println("该信息不存在,请重新输入!");
return;
}
System.out.println("请输入学生新姓名:");
String name = sc.nextLine();
System.out.println("请输入学生新年龄:");
String age = sc.nextLine();
System.out.println("请输入学生新居住地:");
String address = sc.nextLine();
Student s = new Student();
s.setSid(sid);
s.setName(name);
s.setAge(age);
s.setAddress(address);
list.set(i, s);
System.out.println("修改学生成功!");
}
public static boolean compare(ArrayList<Student> list, String sid) {
boolean flag = false;
for (int i = 0; i < list.size(); i++) {
if (list.get(i).getSid().equals(sid)) {
flag = true;
break;
}
}
return flag;
}
}