关于DBUtil的问题，如何解决？(语言-java)

使用DBUtil工具类，实现根据 Stuid 删除一个区域，根据ID删除一个区域 ,标记是否删除成功,1 删除成功 -1 删除失败
public int delStuByID(int areaID) {
}
//DBUtil查询

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUtil {
static String userName= "root";
static String pwd="123456" ;//你的mysql密码
static String dbURL="jdbc:mysql://localhost:3306/user?serverTimezone=PRC&useUnicode=true&characterEncoding=utf8";
static{
try {
Class.forName("com.mysql.cj.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println( "驱动加载失败");
e. printStackTrace();
}
}
public static Connection getConnection(){
Connection con = null;
try {
con=DriverManager.getConnection(dbURL,userName,pwd);
} catch (SQLException e) {
e.printStackTrace();
}
return con;
}
public static void closeJDBC(ResultSet rs,Statement smt, Connection con){
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(smt!= null) {
try {
smt.close();
} catch (SQLException e) {
e. printStackTrace() ;
}
}
if(con!=null) {
try {
con.close() ;
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}

//测试类
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtilTest {
public static void main(String[] args){
String sql="select * from user where id=?";
Connection con=null;
PreparedStatement pst=null;
ResultSet rs=null;
con=DBUtil.getConnection();//连接数据库
try {
pst=con.prepareStatement(sql);
pst.setString(1, "2");
rs=pst.executeQuery();
} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
//循环打印查询出来的结果
try {
while(rs.next()){
System.out.print(rs.getString("id")+"\t");
System.out.print(rs.getString("name")+"\t");
System.out.println(rs.getString("sex")+" ");
}
}
catch (SQLException e) {
e.printStackTrace();
}
DBUtil.closeJDBC(rs, pst, con);
}
}

DBUtil类的代码有吗