Java 请注意，方法类型必须为字符串。如果我在for循环外部返回null，并在内部返回arraylist，这是否有效@谢谢你的帮助。我只是有点困惑，您建议的代码是否在“公共静态字符串GetUpperAveragerRunners（BanffMarathonRunn

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请注意，方法类型必须为字符串。如果我在for循环外部返回null，并在内部返回arraylist，这是否有效@谢谢你的帮助。我只是有点困惑，您建议的代码是否在“公共静态字符串GetUpperAveragerRunners（BanffMarathonRunner[]runners）{”中方法？什么是管道分隔的字符串？是的，这将替换方法中的代码。管道是

-通常使用逗号分隔记录，但由于数据中有

逗号，则需要找到另一个合适的字符，例如管道。好的，谢谢。还有一件事，是您建议的数组st？我想这正是我需要的。我没有涉及过分隔符管道，也没有见过类似String.split（“\\\\\”）的东西然而，在我的课程中，我担心教授可能在寻找更简单的方法。@scarywombat当然，如果你能返回一个列表，那就更好了，但是你不能，我建议使用一些非常标准和基本的Java语言，对于我能返回的内容没有任何要求，只是方法类型必须是String。如果我返回null outide for循环并返回内部的arraylist，这样行吗？@ScaryWombat
// Finding above average:

public static String getAboveAverageRunners(BanffMarathonRunner[] runners) {

    for (int i = 0; i < runners.length; i++) {

        if (runners[i].getTime() <= BanffMarathonRunner.getAverageTime(runners)) {

            String aboveAverage = runners[i].getFirstName() + " " + runners[i].getLastName() + ", Years Competing: "
                    + runners[i].getYears();

            return aboveAverage;

        } // End of if

    } // End of for loop

    return null;

} // End of getAboveAverageRunner method:


} // End of class BanffMarathonRunner:

public static String getAboveAverageRunners(BanffMarathonRunner[] runners) {

    ArrayList<String> thoseAbove = new ArrayList <String>();

    for (int i = 0; i < runners.length; i++) {

        if (runners[i].getTime() <= BanffMarathonRunner.getAverageTime(runners)) {

            String aboveAverage = runners[i].getFirstName() + " " + runners[i].getLastName() + ", Years Competing: "
                    + runners[i].getYears();


            thoseAbove.add(aboveAverage);

            //return aboveAverage;

            // End of if statement:
        }

        // End of for loop:
    }
    return thoseAbove;

StringBuilder myList = new StringBuilder ();
for (int i = 0; i < runners.length; i++) {

    if (runners[i].getTime() <= BanffMarathonRunner.getAverageTime(runners)) {

        String aboveAverage = runners[i].getFirstName() + " " + runners[i].getLastName() + ", Years Competing: "
                + runners[i].getYears();

        myList.append (aboveAverage).append ("|");

        // End of if statement:
    }

    // End of for loop:
}
return myList.toString ();  // maybe remove the trailing pipe

public static List<String> getAboveAverageRunners(BanffMarathonRunner[] runners) {
    int averageTime = BanffMarathonRunner.getAverageTime(runners);

    return Arrays.stream(runners).filter(r -> r.getTime() < average)
      .map(r -> r.getFirstName() + " " + r.getLastName() + ", Years Competing: " + r.getYears())
      .collect(Collectors.toList());
}

public static List<String> getAboveAverageRunners(BanffMarathonRunner[] runners) {
    int averageTime = BanffMarathonRunner.getAverageTime(runners);

    return Arrays.stream(runners).filter(r -> r.getTime() < average)
      .map(r -> r.getFirstName() + " " + r.getLastName() + ", Years Competing: " + r.getYears())
     .collect(Collectors.joining(",", "\"", "\""));
}

public static List<Runner> getAboveAverageRunners(BanffMarathonRunner[] runners) {
    int averageTime = BanffMarathonRunner.getAverageTime(runners);

    return Arrays.stream(runners).filter(r -> r.getTime() < average)
      .collect(Collectors.toList());
}