我应该使用休息吗？退出我的 while 循环？

Question

我需要退出 while 循环，我尝试使用 break；但是，我的下一个输出没有正确对齐。这是我当前的输出（没有中断；）：

List of Gamers:
-----------------------------------------------------------------------------------------------------
Adelie, Carden, Cora, Lada, Mario, Mich, Sally, Xavier-----------------------------------------------------------------------------------------------------

所需的输出应该是：

List of Gamers: 
-----------------------------------------------------------------------------------------------
Adelie, Bob, Carden, Chang, Cora, Jonas, Lada, Lev, Mario, Mason, Mich, Raffi, Sally, Sergio, Xavier
-----------------------------------------------------------------------------------------------

这是我的代码：

public class luis_ramirez_game_scores {

    public static void main(String[] args) {
        String connectionString = "********/game_scores?serverTimezone=UTC";
            String dbLogin = "*****";
            String dbPassword = "******";
            Connection conn = null;
            System.out.println("-----------------------------------------------------------------------------------------------------");
            System.out.println("List of Gamers:");
            System.out.println("-----------------------------------------------------------------------------------------------------");
         // The sql variable has been added to store the SQL statement
            // that we will send to MySQL. This SQL statement asks MySQL
            // for all first names from the gamers table. By default, it
            // will return them in the order in which they are stored in
            // the table (not ordered, in other words).
            String sql = "SELECT first_name FROM gamers ORDER BY first_name";
            // Here are a couple of variations you can try that sorts
            // our list of names ascending and descending
            //String sql = "SELECT first_name FROM gamers ORDER BY first_name";
            //String sql = "SELECT first_name FROM gamers ORDER BY first_name DESC";
            try
            {
              conn = DriverManager.getConnection(connectionString, dbLogin, dbPassword);
              if (conn != null)
              {
                // This nested try-catch structure was added which uses two
                // interfaces from the java.sql package: Statement, which
                // creates a statement object and a ResultSet object which
                // contains the results of the sql statement declared above,
                // and is executed in MySQL using the executeQuery method.
                try (Statement stmt = conn.createStatement(
                ResultSet.TYPE_SCROLL_INSENSITIVE,
                ResultSet.CONCUR_UPDATABLE);
                ResultSet rs = stmt.executeQuery(sql))
                {
                  // If the try is successful, then we should have a
                  // result set (rs) and we can use a while look to
                  // loop through the result set and print the
                  // first names of the gamers. The next() method of
                  // the rs object will return each row in the result
                  // set until there are no more rows left.
                  while (rs.next())
                  {
                    System.out.print(rs.getString("first_name"));
                    if (rs.next()) {
                    System.out.print(", ");
                  }
                } 
                }
                // If the try fails then the catch will run, which in
                // this example it captures any exceptions thrown by
                // SQL and prints those exceptions.
                catch (SQLException ex)
                {
                  System.out.println(ex.getMessage());
                }
                System.out.println("-----------------------------------------------------------------------------------------------------");
              }
            }
            catch (Exception e)
            {
            System.out.println("Database connection failed.");
            e.printStackTrace();
            }
            
          }
}

我添加了中断；低于 System.out.print(", "); 但输出结果相同。如果您能提供任何见解，我们将不胜感激。

Answer 1

要在新行上打印虚线，只需在此处插入 \n（换行符）：

System.out.println("\n-----------------------------------------------------------------------------------------------------");

我应该使用休息吗？退出我的 while 循环？

Should I be using break; to exit my while loop?

java

sql

break

while-loop