1 import java.util.ArrayList;
2 import java.util.List;
3
4 public class CompareTwoListUtil {
5 public static void getList(List<Long> oldGroupIdList, List<Long> newGroupIdList, List<Long> addList, List<Long> delList) {
6 if(newGroupIdList != null && !newGroupIdList.isEmpty()) {
7 //以aList为准，aList比bList多余的部分添加,少的部分删除,相同的部分更新
8 List<Long> updateList1 = new ArrayList();
9 List<Long> updateList2 = new ArrayList();
10
11 //找出需要添加的部分和共同的部分
12 for (int i = 0; i < newGroupIdList.size(); i++) {
13 boolean isAdd = true;
14 Long newGroupId = newGroupIdList.get(i);
15 for (int j = 0; j < oldGroupIdList.size(); j++) {
16 Long bTemp = oldGroupIdList.get(j);
17 if (newGroupId.equals(bTemp)) {
18 updateList1.add(newGroupId);
19 isAdd = false;
20 }
21 }
22 if (isAdd) {
23 addList.add(newGroupId);
24 }
25 }
26 //找出需要删除的部分和共同的部分
27 for (int i = 0; i < oldGroupIdList.size(); i++) {
28 boolean isDel = true;
29 Long bTemp = oldGroupIdList.get(i);
30 for (int j = 0; j < newGroupIdList.size(); j++) {
31 Long aTemp = newGroupIdList.get(j);
32 if (aTemp.equals(bTemp)) {
33 updateList2.add(aTemp);
34 isDel = false;
35 }
36 }
37 if (isDel) {
38 delList.add(bTemp);
39 }
40 }
41 }else {
42 if(oldGroupIdList != null && !oldGroupIdList.isEmpty()) {
43 for (Long aLong : oldGroupIdList) {
44 delList.add(aLong);
45 }
46 }
47 }
48 }
49 }
