Collections是一個工具類，sort是其中的靜態方法，是用來對List類型進行排序的

List<user> list = new ArrayList<user>();user userObject1 = new user();userObject1.setName("zhangsan");userObject1.setJava(11);userObject1.setMaths(11);userObject1.setAspl(11);user userObject2 = new user();userObject2.setName("lisi");userObject2.setJava(4);userObject2.setMaths(5);userObject2.setAspl(6);user userObject3 = new user();userObject3.setName("lisi");userObject3.setJava(1);userObject3.setMaths(2);userObject3.setAspl(3);list.add(userObject1);list.add(userObject2);list.add(userObject3);Collections.sort(list, new Comparator<user>() {@Overridepublic int compare(user s1, user s2) {int flag;// 首選按年齡升序排序int avg1 = s1.getMaths();System.out.println("avg1:"+avg1);int avg2 = s2.getMaths();System.out.println("avg2:"+avg2);flag = avg2-avg1;System.out.println("flag:"+flag);return flag;}});System.out.println("asp 數學 姓名 ");for (user s : list) {System.out.println(s.getAspl() + " " + s.getMaths() + " " + s.getName());}}

總結

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