将文件中的键值对添加到Hashmap中

我试图从文件中提取键值对到Hashmap，以便更容易地操作值。

该文件采用以下格式：

Activity1:3:Activity2:5:Activity3:7: Activity4:1: 每行最多有3个活动及其相应的编号。

String currentPath; Path fullPath; HashMap<String, String> hm = new HashMap<>();

try { // Obtain current directory path currentPath = Paths.get("").toAbsolutePath().toString(); // Obtain full path of data.txt fullPath = Paths.get(currentPath, "data.txt"); // Check if file exists if (Files.exists(fullPath)) { // Read line by line in data.txt Files.lines(fullPath) .forEach(line -> hm.put(line.split(":")[0], line.split(":")[1]) ); } else{ System.out.println("data.txt is not found."); } } catch ( IOException e) { e.printStackTrace(); } 但是，只有第一个键：值对插入到Hashmap中。我试着用

.map(s -> s.split(":")) .collect(Collectors.toMap(r -> r[0], r -> r[1] )) 但它不起作用，因为split()输出类型是一个toMap不接受的数组。

编辑：

public static void main(String[] args) {

    String currentPath;
    Path filePath;
    HashMap<String, String> hm = new HashMap<>();
    Pattern delimiter = Pattern.compile(":");

    try {
        // Obtain current directory path
        currentPath = Paths.get("").toAbsolutePath().toString();
        // Obtain full path of data.txt
        filePath = Paths.get(currentPath, "data.txt");
        // Check if file exists
        if (Files.exists(filePath)) {
            // Read line by line in data.txt
                hm = Files.lines(filePath)
                    .map(delimiter::split) // stream of multiple Array<String>
                    .flatMapToInt(a -> IntStream.range(0, a.length - 1))  // combine multiple Array<String> to a
                        // single stream, remove last Array<String>
                    .filter(i -> i % 2 == 0)  // obtain only even indices
                    .mapToObj(i -> new AbstractMap.SimpleEntry<>(a[i], a[i+1])) // a cannot be resolved. Create new Map, key is Array<String>[even], value is Array<String>[odd]
                    .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (a,b) -> a)); //
        }
        else{
            System.out.println("data.txt not found.");
        }
    } catch (
            IOException e) {
        e.printStackTrace();
    }

    for (String objectName : hm.keySet()) {
        System.out.println(objectName);
        System.out.println(hm.get(objectName));
    }
}