直接代码演示Test public void t1() { Menu m new Menu(); m.setId(1); m.setpId(0); Menu m2 new Menu(); m2.setId(2); m2.setpId(1); Menu m3 new Menu(); m3.setId(3); m3.setpId(1); Menu m4 new Menu(); m4.setId(4); m4.setpId(1); ListMenu list new ArrayList(); list.add(m); list.add(m2); list.add(m3); list.add(m4); ListString ls new ArrayList(); ls.add(1); getIds(list, 1, ls); System.out.println(ls: ls); } private ListString getIds(ListMenu ms, int id, ListString ids) { for (int i 0; i ms.size(); i) { if(ms.get(i).getpId()id){ ids.add(String.valueOf(ms.get(i).getId())); getIds(ms,ms.get(i).getId(),ids); } } return ids; } class Menu { private int id; private int pId; public int getId() { return id; } public void setId(int id) { this.id id; } public int getpId() { return pId; } public void setpId(int pId) { this.pId pId; } }最终会打印ls:[1,2, 3, 4]