Class.forName("oracle.jdbc.driver.OracleDriver");

DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:lc",name,pass);

<protocol>:<subprotocol>:<data source identifier>

Connection con= DriverManager.getConnection("jdbc:oracle:thin:name/pass@localhost:1521:lc");

PreparedStatement pstmt = 
      con.prepareStatement(sql语句);

Statement stmt=con.createStatement();

executeUpdate(),executeQuery(),execute(),

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBConnection {
public static Connection dbConn(String name,String pass)  {
   Connection c = null;
      try {
  Class.forName("oracle.jdbc.driver.OracleDriver");
 } catch (ClassNotFoundException e) {
   e.printStackTrace();
 }
   try {
c =DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:sumoonbest",name,pass);
 } catch (SQLException e1) {
    e1.printStackTrace();
 }
  return c;
 }
}

import java.sql.*;
public class DB extends DBConnection {
 private static Connection con = null; 
 public static void main(String[] args) {    
    try {     
  con=  dbConn("sumoonbest","8848");    
    if (con == null) {
     System.out.print("连接失败");
     System.exit(0);
    }
      String url = "delete from t_user where username='wang'";
    PreparedStatement pres = conn.prepareStatement(url);   
   System.out.print(pres.executeUpdate()) ;
   }  
     con.close();
    } catch (Exception e) {
          e.printStackTrace();
    }
    }
 }