java.lang.ClassNotFoundException: org.postgresql.Driver

import java.io.Console;
import java.sql.*;

public class DB {
    public static void main(String[] args) {
        Connection connection = null;
        Console console = System.console();
        Console username = console.readLine("Username: ");
        String password = new String(console.readPassword("Password: "));
        String database = "*database link*";

        try {
            Class.forName("org.postgresql.Driver");
            connection = DriverManager.getConnection("jdbc:postgresql://" + database, username, password);
            if(connection != null) {
                System.out.println("Connected to Database!");
            }
        } catch (SQLException | ClassNotFoundException e) {
            System.out.println("Connection failed!");
            e.printStackTrace();
        }
    }
}