当我运行图形更新工具时,所有操作都很好,直到我到达最后阶段,如下所示:
Ensuring consistent system... OK
Listing packages... OK
Setting up repositories... OK
Installing packages...
Updating package cache... Failed
错误输出是:
W:The repository 'http://ppa.launchpad.net/upubuntu-com/ppa/ubuntu xenial Release' does not have a Release
我正在尝试实现一个登录检查器,该函数从图形用户界面获取凭据,并比较用户和加密的密码,我不知道如何将输入的密码与.json文件中的密码进行比较 该函数如下所示: public static void checkUsers(String username,String password,String role) {
for (User user : users) {
if (Objects.equals(username, user.getUsername()))
{
//passwords to b
我试图为一个巨大的数据集(兆字节数据)计算分位数(可以用一些精度保证或错误界限来近似)。如何有效地计算分位数。所需条件如下
1) Can be computed efficiently (one-pass) or in a distributed way (merging)
2) High accuracy (or at least can be controlled)
3) Can be re-computed or reproduced in multiple language (java and python)
4) Incrementally updated (not a requir
我正在尝试更新以前在节点4.5上运行的旧应用程序的身份验证系统,但每次尝试登录时都会收到此错误消息。
TypeError [ERR_INVALID_ARG_TYPE]: The "digest" argument must be one of type string or null. Received type undefined
at check (internal/crypto/pbkdf2.js:56:13)
以下是我试图解决的问题
代码的旧版本是:
crypto.pbkdf2Sync(password, new Buffer(this.salt, 'ba