How to connect JDBC to MySQL 5.7

package testmysql; 
import java.sql.*; 
public class Test { 
 
  public static void main(String[] args) { 
    String driver = "com.mysql.jdbc.Driver"; 
    String URL = "jdbc:mysql://localhost:3306/student"; 
    Connection con = null; 
    try 
    { 
      Class.forName(driver); 
    } 
    catch(java.lang.ClassNotFoundException e) 
    { 
      System.out.println("Connect Successfully."); 
      System.out.println("Cant't load Driver"); 
    } 
    try   
    {                                         
      con=DriverManager.getConnection(URL,"root","root"); 
      System.out.println("Connect Successfully."); 
    }  
    catch(Exception e) 
    { 
      System.out.println("Connect fail:" + e.getMessage()); 
    } 
  } 
}

import java.sql.*;  
public class Main {  
  
  public static void main(String[] args) {  
    String driver = "com.mysql.jdbc.Driver";  
    String URL = "jdbc:mysql://localhost:3306/xiaolu";  
    Connection con = null; 
    ResultSet rs = null; 
    Statement st = null; 
    String sql = "select * from student"; 
    try  
    {  
      Class.forName(driver);  
    }  
    catch(java.lang.ClassNotFoundException e)  
    {  
      // System.out.println("Connect Successfully.");  
      System.out.println("Cant't load Driver");  
    }  
    try    
    {                                          
      con=DriverManager.getConnection(URL,"root","root");  
      st=con.createStatement(); 
      rs=st.executeQuery(sql); 
      if(rs!=null) { 
        ResultSetMetaData rsmd = rs.getMetaData(); 
        int countcols = rsmd.getColumnCount(); 
        for(int i=1;i<=countcols;i++) { 
          if(i>1) System.out.print(";"); 
          System.out.print(rsmd.getColumnName(i)+" "); 
        } 
        System.out.println(""); 
        while(rs.next()) { 
          System.out.print(rs.getString("sno")+" "); 
          System.out.print(rs.getString("sname")+" "); 
          System.out.print(rs.getString("ssex")+" "); 
          System.out.print(rs.getString("sage")+" "); 
          System.out.println(rs.getString("sdept")+" "); 
        } 
      } 
      //System.out.println("Connect Successfully.");  
      System.out.println("ok"); 
      rs.close(); 
      st.close(); 
      con.close(); 
    }   
    catch(Exception e)  
    {  
      System.out.println("Connect fail:" + e.getMessage());  
    }  
  }  
}