package student;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Scanner;
public class Student {
private String age;
private String name;
private String id;
private String address;
public Student(String age, String name, String id, String address) {
super();
this.age = age;
this.name = name;
this.id = id;
this.address = address;
}
public Student() {
super();
// TODO Auto-generated constructor stub
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public static void findOutAll(String filename) throws Exception{
ArrayList<Student> array=new ArrayList<Student>();
readDate(filename, array);
if(array.size()==0)
System.out.println("该系统还没有学生");
else {
System.out.println("学号\t\t姓名\t年龄\t地址");
for(int i=0;i<array.size();i++){
Student s=array.get(i);
System.out.println(s.getId()+"\t"+s.getName()+"\t"+s.getAge()+"\t"+s.getAddress());
}
}
}
public static void writeDate(String filename,ArrayList<Student> array) throws IOException{
BufferedWriter bw=new BufferedWriter(new FileWriter(filename));
for(int i=0;i<array.size();i++){
Student s=array.get(i);
StringBuilder ch=new StringBuilder();
ch.append(s.getId()).append(",").append(s.getName()).append(",").append(s.getAge()).append(",").append(s.getAddress()).append(",");
bw.write(ch.toString());
bw.newLine();
bw.flush();
}
bw.close();
}
public static void readDate(String filename,ArrayList<Student> array) throws IOException{
BufferedReader br=new BufferedReader(new FileReader(filename));
String ch;
while((ch=br.readLine())!=null){
Student s=new Student();
String[] sc=ch.split(",");
s.setId(sc[0]);
s.setName(sc[1]);
s.setAge(sc[2]);
s.setAddress(sc[3]);
array.add(s);
}
br.close();
}
public static void addSomeone(String filename) throws IOException{
ArrayList<Student> array=new ArrayList<Student>();
readDate(filename, array);
System.out.println("请输入你想加入学生的学号");
Scanner scanner=new Scanner(System.in);
String id=scanner.nextLine();
boolean flag=false;
for(int i=0;i<array.size();i++){
Student s=array.get(i);
if(s.getId().equals(id)){
flag=true;
}
}
if(flag)
System.out.println("该系统已有此学生,请重新选择操作");
else{
System.out.println("请输入学生的姓名");
String name=scanner.nextLine();
System.out.println("请输入学生的年龄");
String age=scanner.nextLine();
System.out.println("请输入学生的地址");
String address=scanner.nextLine();
Student s=new Student();
s.setId(id);
s.setName(name);
s.setAge(age);
s.setAddress(address);
array.add(s);
writeDate(filename, array);
System.out.println("已成功添加该学生！");
}
}
public static void deleteSomeone(String filename) throws IOException{
ArrayList<Student> array=new ArrayList<Student>();
readDate(filename, array);
System.out.println("请输入你想删除学生的学号");
Scanner sc=new Scanner(System.in);
String k=sc.nextLine();
int index=-1;
for(int i=0;i<array.size();i++){
Student s=array.get(i);
if(s.getId().equals(k))
index=i;
}
if(index==-1)
System.out.println("系统中不存在该学号的学生。");
else {
array.remove(index);
writeDate(filename, array);
System.out.println("已成功删除该学生！");
}
}
public static void reviseSomeone(String filename) throws IOException {
ArrayList<Student> array=new ArrayList<Student>();
readDate(filename, array);
System.out.println("请输入你要修改的学生学号");
Scanner scanner=new Scanner(System.in);
String id=scanner.nextLine();
int index=-1;
for(int i=0;i<array.size();i++){
Student s=array.get(i);
if(s.getId().equals(id))
index=i;
}
if(index!=-1)
{
System.out.println("请输入修改后的姓名");
String name=scanner.nextLine();
System.out.println("请输入修改后的年龄");
String age=scanner.nextLine();
System.out.println("请输入修改后的地址");
String address=scanner.nextLine();
Student s=new Student();
s.setId(id);
s.setName(name);
s.setAge(age);
s.setAddress(address);
array.set(index,s);
writeDate(filename, array);
System.out.println("修改成功！");
}
else System.out.println("没有该学生");
}
public static void main(String[] args) throws Exception {
String filename="text.txt";
ArrayList<Student> array=new ArrayList<Student>();
Scanner scanner=new Scanner(System.in);
boolean flag=true;
while(flag){
System.out.println("-------欢迎来到教学系统-------");
System.out.println("1.查看所有学生");
System.out.println("2.添加学生");
System.out.println("3.删除学生");
System.out.println("4.修改学生");
System.out.println("5.退出");
System.out.println("请输入你的选择:");
int k=scanner.nextInt();
switch(k)
{
case 1:findOutAll(filename);break;
case 2:addSomeone(filename);break;
case 3:deleteSomeone(filename);break;
case 4:reviseSomeone(filename);break;
case 5:System.out.println("谢谢您的使用");flag=false;break;
default:System.out.println("您的输入有误，请重新输入");flag=false;break;
}
}
}
}
