学生管理系统
Student类
public class Student {
private String sid;
private String name;
private String age;
private String address;
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;
}
}
StudentManager类
import java.util.ArrayList;
import java.util.Scanner;
public class StudentManager {
public static void main(String[] args) {
ArrayList<Student> array = 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");
Scanner sc = new Scanner(System.in);
String line = sc.nextLine();
switch (line) {
case "1":
addStudent(array);
break;
case "2":
deleteStudent(array);
break;
case "3":
updateStudent(array);
break;
case "4":
findAllStudent(array);
break;
case "5":
System.out.println("谢谢使用");
System.exit(0);
}
}
}
public static void addStudent(ArrayList<Student> array){
Scanner sc = new Scanner(System.in);
String sid;
while(true) {
System.out.println("请输入学生学号");
sid = sc.nextLine();
boolean flag = isUsed(array, sid);
if (flag) {
System.out.println("你输入的学号已经被使用,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);
array.add(s);
System.out.println("添加学生成功");
}
public static void findAllStudent(ArrayList<Student> array){
if (array.size()==0){
System.out.println("无学生信息,请先添加学生信息");
}else {
System.out.println("学号\t\t\t姓名\t\t年龄\t\t居住地");
for (int i = 0; i < array.size(); i++) {
Student s = array.get(i);
System.out.println(s.getSid() + "\t" + s.getName() + "\t" + s.getAge() + "岁\t\t" + s.getAddress());
}
}
}
public static void deleteStudent(ArrayList<Student> array){
Scanner sc = new Scanner(System.in);
System.out.println("请输入你要删除学生的学号");
String sid = sc.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("该信息不存在,请重新输入");
}else{
array.remove(index);
System.out.println("删除学生成功");
}
}
public static void updateStudent(ArrayList<Student> array){
Scanner sc = new Scanner(System.in);
String sid;
System.out.println("请输入你要修改学生的学号");
sid = sc.nextLine();
boolean flag = isUsed(array, sid);
if (flag==false) {
System.out.println("你输入的学号错误,请重新输入");
}else {
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);
for (int i = 0; i < array.size(); i++) {
Student student = array.get(i);
if (student.getSid().equals(sid)) {
array.set(i, s);
break;
}
}
System.out.println("修改学生成功");
}
}
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;
}
}
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