java编程，求实际代码

Question

java编程:一家小型超市的店主,需要查询,输入,修改所有商品的品名,价格,库存量信息.商品信息存储在文件中,每件商品的标志为其记录号.

Answer 1

商品最好存储在数据库中, 商业应用哪有存在文件里的, 也就是学校练习使用文件存储。
这是一段增删改查的代码, 将里面的MSC类修改成商品类就行了.(既然学过java， 你应该会修改吧)

数据库使用mysql(小型) 或sql server(大型) 均可：建议使用mysql即可
代码:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
class MSC
{
public String MscID;
public String MscName;
public String MscCompany;
public float MscLongitude;
public float MscLatitude;
public float MscAltitude;

public MSC(String MscID, String MscName, String MscCompany,
float MscLongitude, float MscLatitude,float MscAltitude){

this.MscID = MscID;
this.MscName = MscName;
this.MscCompany = MscCompany;
this.MscLongitude =MscLongitude;
this.MscLatitude = MscLatitude;
this.MscAltitude = MscAltitude;

}
}
public class sqlserverjdbc {

public Connection getConnection(){
String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; //加载JDBC驱动
String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=gsm"; //连接服务器和数据库sample
String userName = "sa"; //默认用户名
String userPwd = "123"; //密码
Connection dbConn = null;

try {
Class.forName(driverName);
dbConn =DriverManager.getConnection(dbURL, userName, userPwd);
} catch (Exception e) {
e.printStackTrace();
}

return dbConn;
}

public void printUserInfo(){

Connection con = getConnection();
Statement sta = null;
ResultSet rs = null;
System.out.println("打印表格MSC信息");
try {
sta = con.createStatement();
rs = sta.executeQuery("select * from MSC信息");

System.out.println("MscID\tMscName\tMscCompany\tMscLongitude\tMscLatitude\tMscAltitude");

while(rs.next()){
System.out.println(rs.getString("MscID")+"\t"+
rs.getString("MscName")+"\t"+
rs.getString("MscCompany")+"\t"+
rs.getFloat("MscLongitude")+"\t"+
rs.getFloat("MscLatitude")+"\t"+
rs.getFloat("MscAltitude"));
}

con.close();
sta.close();
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("打印完成\n");

}

public void delete(String MscID){

Connection con = getConnection();
String sql = "delete from MSC信息 where MscID = " + MscID;
PreparedStatement pst;

System.out.println("删除表格MSC信息中 ID = "+MscID+"的记录");
try {
pst = con.prepareStatement(sql);
pst.execute();

pst.close();
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("记录删除失败！！！");
}
System.out.println("记录删除成功！！！\n");

}

public void insert(MSC msc){

Connection con = getConnection();
String sql = "insert into MSC信息 values(?,?,?,?,?,?)";
PreparedStatement pst;

System.out.println("插入一条记录");
try {
pst = con.prepareStatement(sql);
pst.setString(1, msc.MscID);
pst.setString(2, msc.MscName);
pst.setString(3, msc.MscCompany);
pst.setFloat(4, msc.MscLongitude);
pst.setFloat(5, msc.MscLatitude);
pst.setFloat(6, msc.MscAltitude);

pst.execute();

pst.close();
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("插入失败！！！");
}
System.out.println("插入成功！！！\n");

}

//更新MscID的MscName
public void updateMscName(String MscID, String MscName){

Connection con = getConnection();
String sql = "update MSC信息 set MscName = ? where MscID = ?";
PreparedStatement pst;

System.out.println("修改一条记录");
try {
pst = con.prepareStatement(sql);
pst.setString(1, MscName);
pst.setString(2, MscID);

pst.execute();

pst.close();
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("修改失败！！！");
}
System.out.println("修改成功！！！\n");

}

public static void main(String args[]){

sqlserverjdbc sql = new sqlserverjdbc();
sql.printUserInfo();
sql.delete("1111");
sql.printUserInfo();
sql.updateMscName("5215", "联想");
sql.printUserInfo();
sql.insert(new MSC("1111", "中兴" ," 中兴", (float)12.2, (float)3.4,(float)45.5));
sql.printUserInfo();

}
}

Answer 2

加到300可以考虑给你代码追问

我倒是想给你加到300.重点是我没那么多啊，连提问都不够