Java将哨兵值作为数组输入

Question

我需要这个程序接受以下格式的用户输入:“team1 : team2 : score1 : score2”然后将它分配给下面的数组变量，它工作正常但现在我需要在用户输入时这样做“停止”程序显示数组中数据的结果和统计信息。问题是，当您输入停止时，它会尝试将其添加到数组中，但由于我已将输入分成 4 个部分，它只会给我一个错误(异常)

"java.lang.ArrayIndexOutOfBoundsException" error on the "awayteam = results[1];" line.

我的问题是:如果用户输入“停止”，我该如何做到这一点，它不会尝试将其添加到数组中。

// Sample input: Chelsea : Arsenal : 2 : 1

public static final String SENTINEL = "stop";

public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);

        String hometeam = new String();
        String awayteam = new String();
        String homescore = new String();
        String awayscore = new String();

        int result0;
        int result1;

        int sum = 0;

        System.out.println("please enter match results:");

        for (int b = 0; b < 100; b++) {

            String s = sc.nextLine();

            String results[] = s.split(" : "); // parse strings in between the
                                                // dash
                                                // character

            for (String temp : results) {
                hometeam = results[0];
                awayteam = results[1];
                homescore = results[2];
                awayscore = results[3];
            }
            //convert 'score' strings to int value.
            result0 = Integer.valueOf(results[2]);
            result1 = Integer.valueOf(results[3]);

            //stop command 
            if (s.equals(SENTINEL)) {
                System.out.println("stopped");
            }


            // print results

        }

    }
}

Answer 1

你只需要检查哨兵并在尝试解析它之前跳出 for 循环。

此外，您的另一个 for 循环不正确。您将相同的值放入变量 N 次。 (我添加了一条评论，将其标记为不正确)

System.out.println("please enter match results:");

for (int b = 0; b < 100; b++) {

    String s = sc.nextLine();

    //CHECK FOR SENTINAL MATCH RIGHT AFTER READING THE NEXT LINE
    if (s.equals(SENTINAL)) {
      break;
    }

    String results[] = s.split(" : "); // parse strings in between the
                                        // dash
                                        // character



    for (String temp : results) { // You don't need this for loop
        hometeam = results[0]; 
        awayteam = results[1];
        homescore = results[2];
        awayscore = results[3];
    }
    //convert 'score' strings to int value.
    result0 = Integer.valueOf(results[2]);
    result1 = Integer.valueOf(results[3]);

    //stop command 
    if (s.equals(SENTINEL)) {
        System.out.println("stopped");
    }


    // print results

}