如何从控制台拆分用户输入?

时间:2017-01-04 21:52:41

标签: java

如何将一行用户输入拆分为单独的字符串并存储,例如,如果输入格式如下(对于结果图表)..

home_name : away_name : home_score : away_score

我如何将输入分成4个不同的部分并单独存储? (系统将提示用户仅以上述格式输入,并且我使用while循环继续询问行结果,直到用户进入停止状态。)

3 个答案:

答案 0 :(得分:4)

如果输入数据的格式一致,那么您只需使用:之类的模式并执行以下操作:

public static void main(String[] args) {
    /* Scan Inputs */
    Scanner in = new Scanner(System.in);

    /* Input String */
    String input = null;

    /* Create StringBuilder Object */
    StringBuilder builder = new StringBuilder();

    String[] headers = { "home_name: ", "away_name: ", "home_score: ",
            "away_score: " };
    while (null != (input = in.nextLine())) {
        /* Break if user enters stop */
        if ("stop".equalsIgnoreCase(input)) {
            break;
        }

        /* Trim the first and the last character from input string */
        input = input.substring(1, input.length() - 1);

        /* Split the input string using the required pattern */
        String tokens[] = input.split(" : ");

        /* Print the tokens array consisting the result */
        for (int x = 0; x < tokens.length; x++) {
            builder.append(headers[x]).append(tokens[x]).append(" | ");
        }
        builder.append("\n");
    }

    /* Print Results & Close Scanner */
    System.out.println(builder.toString());
    in.close();
}

请注意,在使用给定模式拆分输入字符串之前,我已使用substring()函数删除输入字符串开头和结尾的<>

<强>输入:

<manchester united : chelsea : 3 : 2>
<foobar : foo : 5 : 3>
stop

<强>输出:

home_name: manchester united | away_name: chelsea | home_score: 3 | away_score: 2 | 
home_name: foobar | away_name: foo | home_score: 5 | away_score: 3 | 

答案 1 :(得分:1)

在某些情况下,输入可能有点“不一致”:未提供空格或新版本产生的更改。如果是这种情况,可以使用正则表达式应用一些保护。

public static void main(String[] args) {

    boolean validInput = false; 

    String input = "<home_name : away_name : home_score : away_score>";

    String pattern = "<.*:.*:.*:.*>";
    Pattern r = Pattern.compile(pattern);
    Matcher m = r.matcher(input);
    validInput = m.matches();

    if(validInput) {
        input = input.substring(1, input.length() - 1);
        String tokens[] = input.split("\\s*:\\s*");

        for (int x = 0; x < tokens.length; x++) {
            System.out.println(tokens[x]);
        }

    } else {
        System.out.println("Input is invalid");
    }
}

答案 2 :(得分:0)

如果格式与您所描述的完全一致,那么解析它的一种相当有效的方法是:

public static void main(String[] args) {
    String line = "<Raptors : T-Rexes : 5 : 10>";

    final int colonPosition1 = line.indexOf(':');
    final int colonPosition2 = line.indexOf(':', colonPosition1 + 1);
    final int colonPosition3 = line.indexOf(':', colonPosition2 + 1);

    final String homeName = line.substring(1, colonPosition1 - 1);
    final String awayName = line.substring(colonPosition1 + 2, colonPosition2 - 1);
    final int homeScore = Integer.parseInt(line.substring(colonPosition2 + 2, colonPosition3 - 1));
    final int awayScore = Integer.parseInt(line.substring(colonPosition3 + 2, line.length() - 1));

    System.out.printf("%s: %d vs %s: %d\n", homeName, homeScore, awayName, awayScore);
}