同时基于两个参数进行集合排序

这样就可以了！

        Collections.sort(yourList, new Comparator<TestData>() {     public int compare(TestData o1, TestData o2) {     int date1Diff = o1.getActivation().compareTo(o2.getActivation());     return date1Diff == 0 ?   o1.geTimestamp().compareTo(o2.getTimestamp()) :  date1Diff; } });