Question

我的程序允许用户重复输入匹配结果，直到用户输入“停止”，然后显示结果。我只需要在我的统计数据中找到最高的输入值[2]＆＃39; arraylist，这是＆＃39; hometeam得分＆＃39;。因此，如果用户输入3个输入，＆＃34;曼城：曼联：2：1 ... 切尔西：阿森纳：0：1 ...... 埃弗顿：利物浦：1：1＆＃34;那么它应该显示数字＆＃39; 2＆＃39;因为它是该阵列中的最高值。如果这有道理？我已经在底部设置了我需要显示的行。

public static void main(String args[]) {

    Scanner sc = new Scanner(System.in);
    ArrayList<String[]> stats = new ArrayList<>(); // initialize a container
                                                    // to hold all the stats
    System.out.println("please enter match results:");

    int matchesPlayed = 0;
    int invalidEntry = 0;

    while (sc.hasNextLine()) {

        String input = sc.nextLine();
        String[] results = input.split("\\s*:\\s*");

        if (results.length == 4) {
            stats.add(results);
            matchesPlayed++;
        }

        else if (input.equals("stop")) {
            break;
        }

    } // end of while

    for (int i = 0; i < stats.size(); i++) {

        if (stats.get(i)[0].trim().isEmpty()) {
            System.out
                    .println("no home team name entered on the following line:");
            invalidEntry++;
            matchesPlayed--;
        }

        else if (stats.get(i)[1].trim().isEmpty()) {
            System.out
                    .println("no away team name entered on the following line:");
            invalidEntry++;
            matchesPlayed--;
        }

        else if (stats.get(i)[2].trim().isEmpty()) {
            System.out.println("no home score entered on this line");
            invalidEntry++;
            matchesPlayed--;

        }

        else if (stats.get(i)[3].trim().isEmpty()) {
            System.out.println("no away score entered on this line");
            invalidEntry++;
            matchesPlayed--;
        }

        try {
            System.out.println(String.valueOf(stats.get(i)[0]) + " ["
                    + Integer.valueOf(stats.get(i)[2]) + "] " + " | "
                    + (String.valueOf(stats.get(i)[1])

                    + " [" + Integer.valueOf(stats.get(i)[3]) + "] "));

        } catch (Exception e) {
            // do nothing with any invalid input
        }

    }
    System.out.println(" ");
    System.out.println("Totals");
    System.out.println("-------------------------");
    System.out.println("total number of matches: " + matchesPlayed);
    System.out.println("total number of invalid entries: " + invalidEntry);
    System.out.println("highest home score: ");
}

Answer 1

只需循环遍历它，设置一个等于第一个元素的变量，并在循环中如果有一个元素高于当前变量，则将变量的值更改为该值。然后在末尾打印变量

查找arraylist元素

1 个答案: