Question

我想在这里帮助你们

/ ** *在这项任务中，我应该显示马拉松赛的第一和第二名获胜者（2个最佳时间）的名称和时间 *但我正在努力与第二个 * /

public class MitAssignment3Chapter7 {
public static void main(String args[]){

    String runners[] = {"Gene","Elvis","Presley","Felicity","Welcome"};
    int[] timeInMinutes = {40,50,76,56,62};

    int index = 0;
    int a = 0;
    int first = timeInMinutes[1];

    for (a = 0 ; a < timeInMinutes.length; a++){
        if ( first > timeInMinutes[a]){
            index = a;
            first = timeInMinutes[index];
        }
       // if (first < timeInMinutes[a] && timeInMinutes[a])  Trying to do the second here
    }
    System.out.println("The winner of the marathon is: "+runners[index]+" with "+timeInMinutes[index]+" minutes");

}

}

Answer 1

使用其他集合会很容易..但你也可以用简单的数组来做..不仅第二个，你可以通过排序数组找到所有的跑步者等级..检查这个代码..

     public static void main(String args[]) {
        String runners[] = { "Gene", "Elvis", "Presley", "Felicity", "Welcome" };
        int[] timeInMinutes = { 40, 50, 76, 56, 62 };
        int a = 0;
        int tempTime = 0;
        String tempRunner = "";
        for (int i = 0; i < timeInMinutes.length; i++) {
            for (int j = i + 1; j < timeInMinutes.length; j++) {
                if (timeInMinutes[i] > timeInMinutes[j]) {
                    tempTime = timeInMinutes[i];
                    timeInMinutes[i] = timeInMinutes[j];
                    timeInMinutes[j] = tempTime;

                    tempRunner = runners[i];
                    runners[i] = runners[j];
                    runners[j] = tempRunner;
                }
            }
        }
        for (int index = 0; index < runners.length; index++)
            System.out.println("Rank " + (index+1) + ": " + runners[index] + " with " + timeInMinutes[index] + " minutes");
    }

Answer 2

你可以先找到胜利者，在你找到胜利者之后，从你的时间阵列中取出胜利者并找到当前阵列中最快的人，它将成为第二个玩家。

Answer 3

您可以创建一个新类来保存结果时间和名称。为此类实现compareTo方法。使用所有结果填充新List并对其进行排序。现在可以获得任何Nth结果（时间和名称）。

static class Result implements Comparable<Result> {
    private final int time;
    private final String name;

    Result(int time, String name) {
        this.time = time;
        this.name = name;
    }

    int getTime() { return time; }

    String getName() { return name; }

    @Override
    public int compareTo(Result o) {
        return Integer.compare(time, o.time);
    }
}

public static void main(String args[]){
    String runners[] = {"Gene","Elvis","Presley","Felicity","Welcome"};
    int[] timeInMinutes = {40,50,76,56,62};

    List<Result> results = new ArrayList<>(runners.length);
    for (int i = 0; i < runners.length; i++) {
        results.add(new Result(timeInMinutes[i], runners[i]));
    }

    Collections.sort(results);

    Result second = results.get(1);
    System.out.println("Second winner: " + second.getName() + "; Time: " + second.getTime());
}

显示马拉松的第一和第二名获胜者的姓名和时间

3 个答案: