JavaFX通过多个参数将ObservableList分组到映射中并绑定它们

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;

import java.util.Map;
import java.util.stream.Collectors;

public class GroupingExample {
    public static void main(String[] args) {
        // 创建一个ObservableList
        ObservableList<String> list = FXCollections.observableArrayList(
                "apple", "banana", "orange", "grape", "watermelon", "strawberry"
        );

        // 使用Stream API将列表按照首字母进行分组
        Map<Character, ObservableList<String>> groupedMap = list.stream()
                .collect(Collectors.groupingBy(s -> s.charAt(0),
                        Collectors.toCollection(FXCollections::observableArrayList)));

        // 输出分组结果
        groupedMap.forEach((key, value) -> System.out.println(key + ": " + value));

        // 将分组结果绑定到映射中
        ObservableList<Map.Entry<Character, ObservableList<String>>> groupedEntries =
                FXCollections.observableArrayList(groupedMap.entrySet());

        // 输出绑定结果
        groupedEntries.forEach(entry -> System.out.println(entry.getKey() + ": " + entry.getValue()));
    }
}