connect to database

Question

package exam;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
public class test {
private static final String URL = "jdbc:mysql:// localhost:3306/test2";
private static final String USERNAME = "root";
private static final String PASSWORD = "";
public static void main(String[] args) {
Connection connection;
try {
connection = DriverManager.getConnection(URL,USERNAME,PASSWORD);
System.out.println("connected");
} catch (SQLException e) {
System.out.println("not connected");
e.printStackTrace();
}
}
}
What is wrong???

Answer 1

Check for all the prerequisite before writing this code. SQL query here is just an example.
package exam;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
public class test {
public static void main(String[] args) {
String url = "jdbc:mysql:// localhost:3306/test2";
try {
Connection con= DriverManager.getConnection(url,"root","******");
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("Select * from Employee");
} catch (SQLException e) {
System.out.println("not connected");
e.printStackTrace();
}
}
}