Question

java控制台做一个简单的信息管理系统！（不使用数据库，用list集合操作） 文本文件存储信息，增删查改。

写一个简单的学生信息管理系统
需求如下：
1、不用做UI界面，直接控制台录入数据和输出数据
2、实现学生信息的增、删、改、查
3、学生信息录入字段有：id,name,gender(性别),enterYear(入学年份),major(专业),interest(兴趣)
4、修改条件：根据学生的ID修改学生信息
5、删除条件：根据学生的ID删除
6、查询条件：根据学生的姓名查询

Answer 1

保存在list中了，同时提供写入文件的功能，弱连接db的话，更简单~~望满意~~
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class StudentDeal {
static List<Student> list = null;

public static void main(String[] args) throws IOException {
Date date = new Date(1990, 12, 12, 23, 23);
Student s = new Student(111, "gao", "femal", date, "art", "chess");
StudentDeal sd = new StudentDeal();
sd.add(s);
String name = "gao";
sd.query(name);
sd.update(111, "pig");// 更新id的记录为pig，并写回到文件中；可以修改或者重载modify方法；
sd.delete(111);// 删除id的记录，并写回到文件中；；
}

public StudentDeal() {
list = new ArrayList<Student>();
}

private void query(String name) {
boolean f = false;
for (Student t : list) {
if (t.getName().equals(name)) {
f = true;
}
}
if (f)
System.out.println("yes");
else
System.out.println("no");
}

void add(Student t) throws IOException {
int id = t.getId();
for (Student tmp : list) {
if (tmp.getId() == id) {
// System.out.println("target exsit!");
return;
}
}
list.add(t);
writeToFile(list);
System.out.println("add succeed!");

}

private void delete(int id) throws IOException {
for (int i = 0; i < list.size(); i++) {
Student t = list.get(i);
if (t.getId() == id) {
list.remove(i);
System.out.println("delete succeed!");
} else
System.out.println("delete no such id!");
}
writeToFile(list);
}

private void update(int id, String name) throws IOException {
for (Student t : list) {
if (t.getId() == id) {
t.setName(name);
System.out.println("modify info succeed!");
} else
System.out.println("modify no such id!");
}
writeToFile(list);
}

public List<Student> getList() {
return list;
}

private void writeToFile(List<Student> list2) throws IOException {
BufferedWriter bw = new BufferedWriter(new FileWriter(new File(
"e:/test.txt")));
for (Student t : list) {
bw.write(t.toString());
}
bw.close();
}
}

class Student {

int id;
String intrest;
String gender;
String name;
String major;
Date date;

public Student(int id, String name, String gender, Date date, String major,
String intrest) {
super();
this.id = id;
this.intrest = intrest;
this.name = name;
this.gender = gender;
this.date = date;
this.major = major;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getIntrest() {
return intrest;
}

public void setIntrest(String intrest) {
this.intrest = intrest;
}

public String getGender() {
return gender;
}

public void setGender(String gender) {
this.gender = gender;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getMajor() {
return major;
}

public void setMajor(String major) {
this.major = major;
}

public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}

@Override
public String toString() {
return this.getId() + " " + this.getName() + " " + this.getGender()
+ " " + this.getDate() + " " + this.getMajor() + " "
+ this.intrest + "\n";
}
}