oldList(上次查询到的权限列表),currList(当前查询到的权限列表),比对两个list找出:移除和增加的权限加以标识(1–增加,-1–删除)返回。
//之前写的已经删了手动打下(add处有问题应该用map,将就着看吧)
List<String> removeList =new ArrayList<String>();
List<String> addList =new ArrayList<String>();
for(String old:currList){
if(!currList.contains(old)){
removeList.add(old,"-1")
}
}
for(String curr:oldList){
if(!oldList.contains(curr)){
addList.add(curr,"1")
}
}
//AppAuths返回的变化列表
// 移除权限:上次与当前的权限取差集 (oldAppPrivileges - currAppPrivileges)
List<AppPrivilege> removePrivileges = oldAppPrivileges.stream()
.filter(oldPrivilege ->!currAppPrivileges.contains(oldPrivilege)).collect(toList());
removePrivileges.parallelStream().forEachOrdered(removePrivilege ->
appAuths.add(new AppAuths(removePrivilege, "-1")));
// 增加权限:当前与上次的权限取差集 (currAppPrivileges - oldAppPrivileges)
List<AppPrivilege> addPrivileges = currAppPrivileges.stream()
.filter(currPrivilege ->!oldAppPrivileges.contains(currPrivilege)).collect(toList());
addPrivileges.parallelStream().forEachOrdered(addPrivilege ->
appAuths.add(new AppAuths(addPrivilege, "1")));
package com.ymdd.galaxy.appmanage.core.appauth.service;
import java.util.ArrayList;
import java.util.List;
import static java.util.stream.Collectors.toList;
public class Test {
public static void main(String[] args) {
List<String> list1 = new ArrayList<String>();
list1.add("1");
list1.add("2");
list1.add("3");
list1.add("5");
list1.add("6");
List<String> list2 = new ArrayList<String>();
list2.add("2");
list2.add("3");
list2.add("7");
list2.add("8");
// 交集
List<String> intersection = list1.stream().filter(item -> list2.contains(item)).collect(toList());
System.out.println("---交集 intersection---");
intersection.parallelStream().forEach(System.out :: println);
// 差集 (list1 - list2)
List<String> reduce1 = list1.stream().filter(item -> !list2.contains(item)).collect(toList());
System.out.println("---差集 reduce1 (list1 - list2)---");
reduce1.parallelStream().forEach(System.out :: println);
// 差集 (list2 - list1)
List<String> reduce2 = list2.stream().filter(item -> !list1.contains(item)).collect(toList());
System.out.println("---差集 reduce2 (list2 - list1)---");
reduce2.parallelStream().forEach(System.out :: println);
// 并集
List<String> listAll = list1.parallelStream().collect(toList());
List<String> listAll2 = list2.parallelStream().collect(toList());
listAll.addAll(listAll2);
System.out.println("---并集 listAll---");
listAll.parallelStream().forEachOrdered(System.out :: println);
// 去重并集
List<String> listAllDistinct = listAll.stream().distinct().collect(toList());
System.out.println("---得到去重并集 listAllDistinct---");
listAllDistinct.parallelStream().forEachOrdered(System.out :: println);
System.out.println("---原来的List1---");
list1.parallelStream().forEachOrdered(System.out :: println);
System.out.println("---原来的List2---");
list2.parallelStream().forEachOrdered(System.out :: println);
}
}
上面Test代码出处:https://blog.csdn.net/gzt19881123/article/details/78327465
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