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When to use volatile with multi threading?
If there are two threads accessing a global variable then many tutorials say make the variable volatile to prevent the compiler caching the variable in a register and it thus not getting updated correctly.
However two threads both accessing a shared variable is something which calls for protection v...
How to create a new java.io.File in memory?
... delete or create the file. But the File class does not provide methods to read and write the file contents.
To read and write from a file, you are using a Stream object, like FileInputStream or FileOutputStream. These streams can be created from a File object and then be used to read from and write...
How can I access the MySQL command line with XAMPP for Windows?
... mysql), else it would not see mysql.exe (yes, I had done the cd command already).
– dotNET
Nov 29 '19 at 18:46
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npm not working - “read ECONNRESET”
I'm having a problem with npm, I cant install anything. Here is the error messages:
26 Answers
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How do I create an immutable Class?
...king on creating an immutable class.
I have marked all the properties as read-only.
6 Answers
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What is PostgreSQL explain telling me exactly?
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(When you're using PgAdmin, you can point your mouse at a component to read the cost details.)
The cost is represented as a tuple, e.g. the cost of the LIMIT is cost=0.00..3.39 and the cost of sequentially scanning post is cost=0.00..15629.12. The first number in the tuple is the startup cost a...
What is Domain Driven Design (DDD)? [closed]
...ep seeing DDD (Domain Driven Design) being used a lot in articles - I have read the Wikipedia entry about DDD but still can't figure out what it actually is and how I would go about implementing it in creating my sites?
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When and why are database joins expensive?
...e the rows are materialised.
Materialising the result involves bulk disk reads which are the most expensive aspect of the exercise by an order of magnitude. Performing a join, by contrast, logically requires retrieval of only the keys. In practice, not even the key values are fetched: the key hash...
android pick images from gallery
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Please don't forget to add runtime permissions for READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE for api level 23 and higher. Otherwise you may not get bitmap from gallery as not null. See stackoverflow.com/a/35285667/3341089
– oguzhan
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Reading and writing environment variables in Python? [duplicate]
...the environment variables aren't available from the shell. only python can read the environment variables set this way.
– openCivilisation
Mar 16 '19 at 9:47
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