java.lang.ClassCastException error

Question

Hi I'm practicing Java oracle database connection with Eclipse.

Below is my code:

package connection;

import java.sql.* ;  // for standard JDBC programs
import java.math.* ; //

public class Connection {

    public static void main(String[] args) throws SQLException {
        try {
               Class.forName("oracle.jdbc.driver.OracleDriver");
            }
            catch(ClassNotFoundException ex) {
               System.out.println("Error: unable to load driver class!");
               System.exit(1);
            }

        String URL = "jdbc:oracle:thin:C##AVIVI/avivi9694@localhost:1521:oracleavivi";
        Connection conn = (Connection) DriverManager.getConnection(URL);

Below is the "ERROR":

Exception in thread "main" java.lang.ClassCastException: oracle.jdbc.driver.T4CConnection cannot be cast to connection.Connection
    at connection.Connection.main(Connection.java:18)

I imported all the "jar" file from "jre7'-"lib"folder into my project(I'm a newbie,so didnt quite sure which jar I need so I imported them all,don't know if this will affect the connection or not)

Answer 1

Connection is ambiguous (for you, not for the compiler) here as this is the name of your main class:

     Connection conn = (Connection) DriverManager.getConnection(URL);
     //^^^^^^^^         ^^^^^^^^^^
     //   connection.Connection, not java.sql.Connection

Either rename your class, or use the fully qualified class interface name:

     java.sql.Connection conn = DriverManager.getConnection(URL);

Answer 2

将您的类重命名为例如MyFirstOracleTest（通过refactor-> rename在Eclipse中完成）