How to create a singleton class

Question

What is the best/correct way to create a singleton class in java?

One of the implementation I found is using a private constructor and a getInstance() method.

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Answer 1

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

public class DBConnection {


    private static DBConnection dbConnection;
    private Connection connection;

    private DBConnection() throws ClassNotFoundException, SQLException {
        Class.forName("com.mysql.jdbc.Driver");
        connection = DriverManager.getConnection(/*crate connection*/);
    }

    public Connection getConnection(){
        return connection;
    }
    public static DBConnection getInstance() throws SQLException, ClassNotFoundException {
        return (null==dbConnection) ? (dbConnection = new DBConnection()) : dbConnection;
    }
}