Question

我正在开发一个小项目，它将用户输入（匹配结果）放在一行上，拆分输入并以不同的格式输出相同的数据。我正在努力寻找一种以特定格式输出数据的方法。除了玩的总游戏外，我希望我的程序能够以

格式生成类似输出的图表

home_name [home_score] | away_name [away_score]

这是我现在的代码，它允许用户以下列格式逐行输入结果

home_name : away_name : home_score : away_score

直到他们进入stop，这会打破循环（并希望很快输出数据）。

import java.util.*;
public class results {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int totalGames = 0;
        String input = null;
        System.out.println("Please enter results in the following format"
                + " home_name : away_name : home_score : away_score"
                + ", or enter stop to quit");

        while (null != (input = scan.nextLine())){
            if ("stop".equals(input)){
                break;
            }
            String results[] = input.split(" : ");
            for (int x = 0; x < results.length; x++) {

            }       
        totalGames++;
        }
        System.out.println("Total games played is " + totalGames);  
    }
}

Answer 1

您可以看到here。

您可以根据需要设置文本格式。

一般语法是％[arg_index $] [flags] [width] [.precision]转换char参数编号从1开始（不是0）。所以要打印第一个参数，你应该使用1 $（如果您使用显式排序）。

Answer 2

您可以使用regEx来解析该行：

（\ w）的\ S（\ w）的\ S | \ S（\ w）的\ S（\ w）的

基于来自（来自http://tutorials.jenkov.com/java-regex/matcher.html）

的Java代码

import java.util.regex.Pattern;
import java.util.regex.Matcher;

    public class MatcherFindStartEndExample{

        public static void main(String[] args){

            String text = "Belenenses 6 | Benfica 0";

            String patternString = "(\\w+)\\s(\\w+)\\s\\|\\s(\\w+)\\s(\\w+)";

            Pattern pattern = Pattern.compile(patternString);
            Matcher matcher = pattern.matcher(text);


            while (matcher.find()){
                    System.out.println("found: " + matcher.group(1));
                    System.out.println("found: " + matcher.group(2));
                    System.out.println("found: " + matcher.group(3));
                    System.out.println("found: " + matcher.group(4));
            }
        }}

使用此代码代替

 String results[] = input.split(" : ");
            for (int x = 0; x < results.length; x++) {

            }

Answer 3

您可以通过将results数组值添加到finalResults ArrayList来保留游戏统计信息。然后输入结果stop输入。
对于计算每个团队HashMap<String, Integer>的总结果是最佳选择。

以下是包含注释的完整代码：

import java.util.*;

// following the naming conventions class name must start with a capital letter
public class Results {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int totalGames = 0;
        String input;
        System.out.println("Please enter results in the following format: \n"
                + "'HOME_NAME : AWAY_NAME : HOME_SCORE : AWAY_SCORE' \n"
                + "or enter 'stop' to quit");

        // HashMap to keep team name as a key and its total score as value
        Map<String, Integer> scoreMap = new HashMap<>();
        // ArrayList for storing game history
        List<String> finalResults = new ArrayList<>();
        // don't compare null to value. Read more http://stackoverflow.com/questions/6883646/obj-null-vs-null-obj
        while ((input = scan.nextLine()) != null) {
            if (input.equalsIgnoreCase("stop")) {   // 'Stop', 'STOP' and 'stop' are all OK
                scan.close(); // close Scanner object
                break;
            }
            String[] results = input.split(" : ");

            // add result as String.format. Read more https://examples.javacodegeeks.com/core-java/lang/string/java-string-format-example/
            finalResults.add(String.format("%s [%s] | %s [%s]", results[0], results[2], results[1], results[3]));

            // check if the map already contains the team
            // results[0] and results[1] are team names, results[2] and results[3] are their scores
            for (int i = 0; i < 2; i++) {
                // here is used the Ternary operator. Read more http://alvinalexander.com/java/edu/pj/pj010018
                scoreMap.put(results[i], !scoreMap.containsKey(results[i]) ?
                        Integer.valueOf(results[i + 2]) :
                        Integer.valueOf(scoreMap.get(results[i]) + Integer.valueOf(results[i + 2])));
            }
            totalGames++; // increment totalGames
        }

        System.out.printf("%nTotal games played: %d.%n", totalGames); // output the total played games

        // output the games statistics from ArrayList finalResults
        for (String finalResult : finalResults) {
            System.out.println(finalResult);
        }

        // output the score table from HashMap scoreMap
        System.out.println("\nScore table:");
        for (Map.Entry<String, Integer> score : scoreMap.entrySet()) {
            System.out.println(score.getKey() + " : " + score.getValue());
        }
    }
}

现在使用输入进行测试：

team1 : team2 : 1 : 0
team3 : team1 : 3 : 2
team3 : team2 : 2 : 2
sToP

输出结果为：

Total games played: 3.

team1 [1] | team2 [0]
team3 [3] | team1 [2]
team3 [2] | team2 [2]

Score table:
team3 : 5
team1 : 3
team2 : 2

Answer 4

你应该做两次事情：

1）检索用户输入的信息并将其存储在自定义类的实例中：PlayerResult。

2）根据预期格式执行输出。您还应该在创建图形表之前计算每列的最大大小否则你可能会有一个难看的渲染。

第一步：

List<PlayerResult> playerResults = new ArrayList<PlayerResult>();

...
String[4] results = input.split(" : "); 
playerResults.add(new PlayerResult(results[0],results[1],results[2],results[3])

第二步：

// compute length of column
int[] lengthByColumn = computeLengthByColumn(results);
int lengthHomeColumn = lengthByColumn[0];
int lengthAwayColumn = lengthByColumn[1];

// render header
System.out.print(adjustLength("home_name [home_score]", lengthHomeColumn));
System.out.println(adjustLength("away_name [away_score]", lengthAwayColumn));

// render data
for (PlayerResult playerResult : playerResults){
   System.out.print(adjustLength(playerResult.getHomeName() + "[" + playerResult.getHomeName() + "]", lengthHomeColumn));
   System.out.println(adjustLength(playerResult.getAwayName() + "[" + playerResult.getAwayScore() + "]", lengthAwayColumn));
 }

如何以特定布局输出到控制台？

4 个答案: