How can I tell an object how many times it has been created?

I have a class that has an attribute called int nth_instance and I want it to count the how many created object it is. ( I’m really sorry for the bad english, I don’t know how to describe this, but I hope you get my point).

Here’s my approach.

class K{     static int nth_instance;     K(){      nth_instance++; // here's the problem, every other instance gets the     }                 //  same value       public static void main(String[] args){      K k1 = new K(); // This object should have nth_instance set to 1      K k2 = new K(); // n_th_instance should be 2, but k1 is now also 2    }  } 

So the problem is that every instance of K gets the nth_instance value of the last created object.

Why is breach-detection site “Have I Been Pwned” considered safe?

Whether it be due to technology the site is using, or any manual behind-the-scenes work with the data, why does this breach detection site seem to be unquestioningly safe?

Wouldn’t the data of you, as a user(breached/pwned or not), utilizing this tool be used against you if not secure properly(see examples below)? What is this website/project doing or using to prevent this?

If you go to this site, enter your information, you are at least providing the potential Boolean checkbox of: “Visitor [YourUsernameProvided] cares to check.”

Is this not valuable data? If black hats out there have something like a list of 2,000,000, and they take/intercept the data provided by this site, couldn’t they get a smaller list of 12,000? A curated list of targets that “care”? “Targets that care” can mean “Targets that have value”. It can mean “Targets that are active”. Perhaps even “Targets who are actually humans, not bots”.

On another note, if you use the site to check multiples of your usernames, wouldn’t you potentially be crafting a list of “All these usernames have been accessed from this location” and therefore be tying all your online personas together?

This all sounds like free work given to black hats. So, what technologies or methods are in place to prevent such a thing?

How can a client verify that code sent from the server has not been tampered with?

While trying to understand the recent controversy involving Protonmail, I started to wonder if its possible to verify that the opensource JavaScript being sent from the server to the client hasn’t been tampered with.

If I understand correctly, you cannot use E2EE in the browser because technically if the server was compromised the server could send malicious JavaScipt to the client and respond with the client’s secret encryption key/password.

If I am a developer, how could I ensure that my client is receiving the same JavaScript that is stored in my public GitHub repo? Is this even possible?

Folder from one branch, that’s been added to my .gitignore, exists when I switch to a different branch

I’m working on two branches: branch A and branch B. The contents of each branch are as follows:

**branch A** |-parent |-folder1 |-folder2

**branch B** |-parent |-folder3 |-some_folder |-some_other_stuff |-more_stuff

I have added “some_folder” to .gitignore. New files are created and added to “some_folder” while working on branch B, hence modifying it. Even though it’s supposed to get ignored and git status doesn’t list the folder at all (as it should), when I switch to branch A, folder3 is now listed when I execute ls along with “some_folder”, but when I execute git status it says my working tree is clean. My working tree in branch A now looks like this:

|-parent |-folder1 |-folder2 |-folder3 |-some_folder

Shouldn’t “some_folder” be contained in branch B and not be carried over when switching to my other branch?

How can an app know that my phone has been rooted?

I changed my bank and it seems that the only possible way of accessing their online website is having installed an app called “tan2go dkb”.

I’ve read that it is not possible to use it with a rooted phone. I won’t change my phone just because the bank says so, so I tried to use an old motorola moto g 1st gen.

I erased everything, and flashed the stock rom, I also tried to flash a stock firmware. After flashing the new stock ROM I install some apps to tell if I’m still root and they say I’m not.

So, which kind of check are they doing in order to tell that my phone is rooted even after flashing a clean stock ROM?