使用java stream获取列表层次结构

public class NestedList {
    private Object value;
    private List<NestedList> children;

    // 构造函数和其他方法

    // Getter和Setter方法
}

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class ListHierarchy {
    public static List<Object> getListHierarchy(NestedList nestedList) {
        return Stream.concat(
                Stream.of(nestedList.getValue()),
                nestedList.getChildren()
                        .stream()
                        .flatMap(child -> getListHierarchy(child).stream())
        ).collect(Collectors.toList());
    }

    public static void main(String[] args) {
        // 创建一个示例的嵌套列表
        NestedList nestedList = new NestedList();
        nestedList.setValue("A");

        NestedList child1 = new NestedList();
        child1.setValue("B");

        NestedList grandchild1 = new NestedList();
        grandchild1.setValue("C");

        NestedList grandchild2 = new NestedList();
        grandchild2.setValue("D");

        child1.setChildren(List.of(grandchild1, grandchild2));

        NestedList child2 = new NestedList();
        child2.setValue("E");

        nestedList.setChildren(List.of(child1, child2));

        // 使用Stream获取列表层次结构
        List<Object> listHierarchy = getListHierarchy(nestedList);

        // 输出结果
        System.out.println(listHierarchy);
    }
}