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目录
前言
提示：这里可以添加本文要记录的大概内容：
12月25日练习内容
提示：以下是本篇文章正文内容，下面案例可供参考
一、需求
----------欢迎来到学生管理系统----------
1。添加学生
2.删除学生
3.修改学生
4.查看所有学生
0.推出
请输入你的选择：
完善上述学生管理系统需求功能
二、学生类
1.类成员
学生需要知道学号，姓名，年龄，地址。
代码如下（示例）：
-
private String sId;
//学号
-
private String name;
//姓名
-
private String age;
//年龄
-
private String address;
//地址
2.类实现
因为成员使私有的，所以需要创建setxx还有getxx方法让其他类进行访问。
代码如下（示例）：
-
public
class
student {
-
private String sId;
//学号
-
private String name;
//姓名
-
private String age;
//年龄
-
private String address;
//地址
-
-
//默认构造
-
-
public
student
() {
-
-
}
-
-
//有参构造
-
public
student
(String sId, String name, String age, String address) {
-
this.sId = sId;
-
this.name = name;
-
this.age = age;
-
this.address = address;
-
}
-
-
//get / set 函数
-
-
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;
-
}
-
}
三、学生管理类
1.需要设计的方法
-
public
class
StudentManager {
-
static
int
userSel
= -
1;
//选择
-
static ArrayList<student> array =
new
ArrayList<>();
//储存学生信息
-
-
public
static
void
main
(String[] args) {
-
-
}
-
-
//主界面
-
public
static
int
menu
() {
-
-
}
-
-
//添加学生信息
-
public
static
void
addStudent
(ArrayList<student> array) {
-
-
-
}
-
-
//判断学号是否重复
-
public
static
boolean
isUsed
(ArrayList<student> array, String sid) {
-
-
}
-
-
//查看学生信息
-
public
static
void
findStudent
(ArrayList<student> array) {
-
-
-
}
-
-
//删除学生信息
-
public
static
void
deleteStudent
(ArrayList<student> array) {
-
-
}
-
-
//修改学生信息
-
public
static
void
updateStudent
(ArrayList<student> array) {
-
-
}
2.主界面方法完善
使用switch语句
-
public
static
int
menu
() {
-
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(
"0.推出");
-
System.out.println(
"请输入你的选择：");
-
-
Scanner
input
=
new
Scanner(System.in);
//输入
-
userSel = input.nextInt();
-
switch (userSel) {
-
case
1:
-
addStudent(array);
-
break;
-
case
2:
-
deleteStudent(array);
-
break;
-
case
3:
-
updateStudent(array);
-
break;
-
case
4:
-
findStudent(array);
-
break;
-
case
0:
-
System.out.println(
"感谢你的使用，再见！！");
-
break;
-
default:
-
System.out.println(
"你的输入有误，请重新输入！！");
-
break;
-
}
-
return userSel;
-
}
3. 添加学生信息方法
-
public
static
void
addStudent
(ArrayList<student> array) {
-
//创建学生对象
-
-
Scanner
input
=
new
Scanner(System.in);
//输入
-
student
s
=
new
student();
-
-
//添加数据
-
while (
true) {
-
System.out.println(
"请输入学生的学号：");
-
String
sid
= input.nextLine();
-
s.setsId(sid);
-
if (isUsed(array, sid)) {
-
System.out.println(
"添加失败，学号已存在");
-
}
else {
-
break;
-
}
-
}
-
System.out.println(
"请输入学生的姓名：");
-
String
name
= input.nextLine();
-
s.setName(name);
-
-
System.out.println(
"请输入学生的年龄：");
-
String
age
= input.nextLine();
-
s.setAge(age);
-
-
System.out.println(
"请输入学生的地址：");
-
String
address
= input.nextLine();
-
s.setAddress(address);
-
-
//将数据添加到集合
-
array.add(s);
-
-
//输出信号
-
System.out.println(
"添加学生信息成功！");
-
-
}
4.判断学号是否重复方法
-
public
static
boolean
isUsed
(ArrayList<student> array, String sid) {
-
boolean
flag
=
false;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
if (s.getsId().equals(sid)) {
-
flag =
true;
-
break;
-
}
-
}
-
return flag;
-
}
5.查看学生信息方法
-
public
static
void
findStudent
(ArrayList<student> array) {
-
if (array.size() ==
0) {
-
System.out.println(
"查找失败，请先添加信息！");
-
return;
-
}
else {
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
System.out.println(
"学号：" + s.getsId() +
"\t" +
"姓名：" + s.getName() +
"\t" +
"年龄：" + s.getAddress() +
"\t" +
"地址：" + s.getAddress());
-
}
-
}
-
-
}
6.删除学生信息方法
-
public
static
void
deleteStudent
(ArrayList<student> array) {
-
Scanner
input
=
new
Scanner(System.in);
-
System.out.println(
"请选择入：");
-
System.out.println(
"1.根据学号删除");
-
System.out.println(
"2.根据姓名删除");
-
int
choose
= input.nextInt();
-
switch (choose) {
-
case
1: {
-
System.out.println(
"请输入需要删除的学生的学号：");
-
Scanner
in
=
new
Scanner(System.in);
-
String
sid
= in.nextLine();
-
int
index
= -
1;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
if (s.getsId().equals(sid)) {
-
index = i;
-
break;
-
}
-
}
-
if (index == -
1) {
-
System.out.println(
"删除失败，该学生不存在");
-
}
else {
-
array.remove(index);
-
System.out.println(
"删除成功！");
-
}
-
break;
-
}
-
case
2: {
-
Scanner
in
=
new
Scanner(System.in);
-
System.out.println(
"请输入需要删除的学生的姓名：");
-
String
name
= in.nextLine();
-
int
index
= -
1;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
if (s.getName().equals(name)) {
-
index = i;
-
break;
-
}
-
}
-
if (index == -
1) {
-
System.out.println(
"删除失败，该学生不存在");
-
}
else {
-
array.remove(index);
-
System.out.println(
"删除成功！");
-
}
-
break;
-
}
-
default:
-
System.out.println(
"输入错误，请重新输入");
-
break;
-
}
-
}
7.修改学生信息方法
-
public
static
void
updateStudent
(ArrayList<student> array) {
-
Scanner
input
=
new
Scanner(System.in);
//输入
-
-
student
s
=
new
student();
-
-
System.out.println(
"请输入你要修改的学生的学号：");
-
String
id
= input.nextLine();
-
-
//添加数据
-
System.out.println(
"请输入你要修改的学生的新学号：");
-
String
sid
= input.nextLine();
-
s.setsId(sid);
-
-
System.out.println(
"请输入你要修改的学生的新姓名：");
-
String
name
= input.nextLine();
-
s.setName(name);
-
-
System.out.println(
"请输入你要修改的学生的新年龄：");
-
String
age
= input.nextLine();
-
s.setAge(age);
-
-
System.out.println(
"请输入你要修改的学生的新地址：");
-
String
address
= input.nextLine();
-
s.setAddress(address);
-
-
//遍历集合找到需要修改学生
-
int
index
= -
1;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s1
= array.get(i);
-
if (s1.getsId().equals(id)) {
-
index = i;
-
break;
-
}
-
}
-
if (index == -
1) {
-
System.out.println(
"修改失败，该学生不存在");
-
}
else {
-
array.set(index, s);
-
System.out.println(
"修改成功");
-
}
-
}
四、完整代码
1.学生类代码
-
public
class
student {
-
private String sId;
//学号
-
private String name;
//姓名
-
private String age;
//年龄
-
private String address;
//地址
-
-
//默认构造
-
-
public
student
() {
-
-
}
-
-
//有参构造
-
public
student
(String sId, String name, String age, String address) {
-
this.sId = sId;
-
this.name = name;
-
this.age = age;
-
this.address = address;
-
}
-
-
//get / set 函数
-
-
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;
-
}
-
}
2.学生管理系统类代码
-
import java.util.ArrayList;
-
import java.util.Scanner;
-
-
public
class
StudentManager {
-
static
int
userSel
= -
1;
//选择
-
static ArrayList<student> array =
new
ArrayList<>();
//储存学生信息
-
-
public
static
void
main
(String[] args) {
-
-
while (
true) {
-
int
res
= menu();
-
if (res ==
0)
-
break;
-
}
-
}
-
-
//主界面
-
public
static
int
menu
() {
-
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(
"0.推出");
-
System.out.println(
"请输入你的选择：");
-
-
Scanner
input
=
new
Scanner(System.in);
//输入
-
userSel = input.nextInt();
-
switch (userSel) {
-
case
1:
-
addStudent(array);
-
break;
-
case
2:
-
deleteStudent(array);
-
break;
-
case
3:
-
updateStudent(array);
-
break;
-
case
4:
-
findStudent(array);
-
break;
-
case
0:
-
System.out.println(
"感谢你的使用，再见！！");
-
break;
-
default:
-
System.out.println(
"你的输入有误，请重新输入！！");
-
break;
-
}
-
return userSel;
-
}
-
-
//添加学生信息
-
public
static
void
addStudent
(ArrayList<student> array) {
-
//创建学生对象
-
-
Scanner
input
=
new
Scanner(System.in);
//输入
-
student
s
=
new
student();
-
-
//添加数据
-
while (
true) {
-
System.out.println(
"请输入学生的学号：");
-
String
sid
= input.nextLine();
-
s.setsId(sid);
-
if (isUsed(array, sid)) {
-
System.out.println(
"添加失败，学号已存在");
-
}
else {
-
break;
-
}
-
}
-
System.out.println(
"请输入学生的姓名：");
-
String
name
= input.nextLine();
-
s.setName(name);
-
-
System.out.println(
"请输入学生的年龄：");
-
String
age
= input.nextLine();
-
s.setAge(age);
-
-
System.out.println(
"请输入学生的地址：");
-
String
address
= input.nextLine();
-
s.setAddress(address);
-
-
//将数据添加到集合
-
array.add(s);
-
-
//输出信号
-
System.out.println(
"添加学生信息成功！");
-
-
}
-
-
//判断学号是否重复
-
public
static
boolean
isUsed
(ArrayList<student> array, String sid) {
-
boolean
flag
=
false;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
if (s.getsId().equals(sid)) {
-
flag =
true;
-
break;
-
}
-
}
-
return flag;
-
}
-
-
//查看学生信息
-
public
static
void
findStudent
(ArrayList<student> array) {
-
if (array.size() ==
0) {
-
System.out.println(
"查找失败，请先添加信息！");
-
return;
-
}
else {
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
System.out.println(
"学号：" + s.getsId() +
"\t" +
"姓名：" + s.getName() +
"\t" +
"年龄：" + s.getAddress() +
"\t" +
"地址：" + s.getAddress());
-
}
-
}
-
-
}
-
-
//删除学生信息
-
public
static
void
deleteStudent
(ArrayList<student> array) {
-
Scanner
input
=
new
Scanner(System.in);
-
System.out.println(
"请选择入：");
-
System.out.println(
"1.根据学号删除");
-
System.out.println(
"2.根据姓名删除");
-
int
choose
= input.nextInt();
-
switch (choose) {
-
case
1: {
-
System.out.println(
"请输入需要删除的学生的学号：");
-
Scanner
in
=
new
Scanner(System.in);
-
String
sid
= in.nextLine();
-
int
index
= -
1;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
if (s.getsId().equals(sid)) {
-
index = i;
-
break;
-
}
-
}
-
if (index == -
1) {
-
System.out.println(
"删除失败，该学生不存在");
-
}
else {
-
array.remove(index);
-
System.out.println(
"删除成功！");
-
}
-
break;
-
}
-
case
2: {
-
Scanner
in
=
new
Scanner(System.in);
-
System.out.println(
"请输入需要删除的学生的姓名：");
-
String
name
= in.nextLine();
-
int
index
= -
1;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s
= array.get(i);
-
if (s.getName().equals(name)) {
-
index = i;
-
break;
-
}
-
}
-
if (index == -
1) {
-
System.out.println(
"删除失败，该学生不存在");
-
}
else {
-
array.remove(index);
-
System.out.println(
"删除成功！");
-
}
-
break;
-
}
-
default:
-
System.out.println(
"输入错误，请重新输入");
-
break;
-
}
-
}
-
-
//修改学生信息
-
public
static
void
updateStudent
(ArrayList<student> array) {
-
Scanner
input
=
new
Scanner(System.in);
//输入
-
-
student
s
=
new
student();
-
-
System.out.println(
"请输入你要修改的学生的学号：");
-
String
id
= input.nextLine();
-
-
//添加数据
-
System.out.println(
"请输入你要修改的学生的新学号：");
-
String
sid
= input.nextLine();
-
s.setsId(sid);
-
-
System.out.println(
"请输入你要修改的学生的新姓名：");
-
String
name
= input.nextLine();
-
s.setName(name);
-
-
System.out.println(
"请输入你要修改的学生的新年龄：");
-
String
age
= input.nextLine();
-
s.setAge(age);
-
-
System.out.println(
"请输入你要修改的学生的新地址：");
-
String
address
= input.nextLine();
-
s.setAddress(address);
-
-
//遍历集合找到需要修改学生
-
int
index
= -
1;
-
for (
int
i
=
0; i < array.size(); i++) {
-
student
s1
= array.get(i);
-
if (s1.getsId().equals(id)) {
-
index = i;
-
break;
-
}
-
}
-
if (index == -
1) {
-
System.out.println(
"修改失败，该学生不存在");
-
}
else {
-
array.set(index, s);
-
System.out.println(
"修改成功");
-
}
-
}
-
}
总结
提示：这里对文章进行总结：
转载：https://blog.csdn.net/qq_58210976/article/details/128436704
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