java - 如何在同一类的其他对象中设置同一类对象

Question

我想优化这段代码，因为我可以有多个 parent 和 child (在 hibernate 中 self 加入)。我希望一些家长能够照顾 child 。例如，事件是一个父事件，它可能有第 n 个子事件，例如编辑、创建、更新、删除。而像 Deals、Movies 和 Resturant 这样的一些家长可能有 child ，也可能没有。有没有办法编写通用代码

        Privilege parent = new Privilege("Event");
        Privilege parent1 = new Privilege("Deals");
        Privilege parent2 = new Privilege("Movies");
        Privilege parent3 = new Privilege("Restaurant");

        Privilege parent4 = new Privilege("Outdoor");

        Privilege child = new Privilege("Create");
        child.setParentId(parent);

        Privilege child1 = new Privilege("Edit");
        child1.setParentId(parent);

        Privilege child2 = new Privilege("Update");
        child2.setParentId(parent);
        Privilege child3 = new Privilege("Delete");
        child3.setParentId(parent);

Answer 1

您可以创建这样的函数来设置权限

private static List<Privilege> setPrivileges() {

        Privilege parent = setParentPrivilege("Event");
        Privilege parent1 = setParentPrivilege("Deals");
        Privilege parent2 = setParentPrivilege("Movies");
        Privilege parent3 = setParentPrivilege("Restaurant");
        Privilege parent4 = setParentPrivilege("Outdoor");

        Privilege child = setFirstLevel(parent, "Create");
        Privilege child1 = setFirstLevel(parent, "Edit");
        Privilege child2 = setFirstLevel(parent, "Update");
        Privilege child3 = setFirstLevel(parent, "Delete");
        Privilege subchild1 = setSecondLevel(child3,"Sub Delete");

        return Collections.unmodifiableList(
                Arrays.asList(
                        parent,
                        parent1,
                        parent2,
                        parent3,
                        parent4,
                        child,
                        child1,
                        child2,
                        child3,
                        subchild1
        ));
    }

    private static Privilege setParentPrivilege(String name) {
        return new Privilege(name);
    }

    private static Privilege setFirstLevel(Privilege firstLevel, String name) {
        Privilege firstLevelChild = setParentPrivilege(name);
        firstLevelChild.setParentId(firstLevel);
        return firstLevelChild;
    }

    private static Privilege setSecondLevel(Privilege secondLevel, String name) {
        Privilege secondLevelChild = new Privilege(name);
        secondLevelChild.setParentId(secondLevel);
        return secondLevelChild;
    }