Java实现无限极分类

    /**
     * 递归
     */
    public static List<Object> getTree(List<Menus> list, String pk, String pid, String child, int root) {
        List<Object> tree = new ArrayList<Object>();

        for (Menus menus : list) {
            int menus_pid = menus.getpId();
            if (menus_pid == root) {
                int id = menus.getId();
                MenusCustom menusCustom = new MenusCustom();
                menusCustom.setId(menus.getId());
                menusCustom.setName(menus.getName());
                menusCustom.setpId(menus.getpId());
                menusCustom.setUri(menus.getUri());
                menusCustom.setChild(MenusUtil.getTree(list, pk, pid, child, id));
                tree.add(menusCustom);
            }
        }
        return tree;
    }

    // 利用重载设置默认参数
    public static List<Object> getTree(List<Menus> list) {
        return MenusUtil.getTree(list, "id", "pid", "child", 0);
    }

这是 Menus 类

public class Menus {
    private Integer id;

    private String name;

    private String uri;

    private Integer pId;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

    public String getUri() {
        return uri;
    }

    public void setUri(String uri) {
        this.uri = uri == null ? null : uri.trim();
    }

    public Integer getpId() {
        return pId;
    }

    public void setpId(Integer pId) {
        this.pId = pId;
    }
}

这是 MenusCustom 类

public class MenusCustom extends Menus {
    public Object getChild() {
        return child;
    }

    public void setChild(Object child) {
        this.child = child;
    }

    private Object child;

}