Java I/O - 如何通过Console.readLine方法从控制台读取行

import java.io.Console;
import java.sql.SQLException;

public class Main {
  public static void main(String[] args) throws ClassNotFoundException, SQLException {
    Console console = System.console();
    if (console == null) {
      System.err.println("sales: unable to obtain console");
      return;
    }

    String username = console.readLine("Enter username: ");
    System.out.println(username);
  }
}