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How do you find all subclasses of a given class in Java?
...iven interface) in Java?
As of now, I have a method to do this, but I find it quite inefficient (to say the least).
The method is:
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Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
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Well, this answer has become its own beast. Many new versions, it was getting stupid long. Many thanks to all of the great many contributors to this answer. But, in order to keep it simple for the masses. I archived all the versions/history of this answe...
How to COUNT rows within EntityFramework without loading contents?
...ying to determine how to count the matching rows on a table using the EntityFramework.
7 Answers
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ssh: The authenticity of host 'hostname' can't be established
When i ssh to a machine, sometime i get this error warning and it prompts to say "yes" or "no". This cause some trouble when running from scripts that automatically ssh to other machines.
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Career day in kindergarten: how to demonstrate programming in 20 minutes? [closed]
I was invited to the kindergarten group of my elder daughter to talk and answer the kids' questions about my profession. There are 26 kids of age 4-6 in the group, plus 3 teachers who are fairly scared of anything related to programming and IT themselves, but bold enough to learn new tricks. I would...
How is a tag different from a branch in Git? Which should I use, here?
...ing some difficulty understanding how to use tags versus branches in git .
12 Answers
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How does a hash table work?
...xplanation in layman's terms.
Let's assume you want to fill up a library with books and not just stuff them in there, but you want to be able to easily find them again when you need them.
So, you decide that if the person that wants to read a book knows the title of the book and the exact title to...
Iterate through a HashMap [duplicate]
What's the best way to iterate over the items in a HashMap ?
7 Answers
7
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PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
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This is a typical bidirectional consistency problem. It is well discussed in this link as well as this link.
As per the articles in the previous 2 links you need to fix your setters in both sides of the bidirectional relationship. An example setter for the One side is in this ...
Change project name on Android Studio
...as shown in the image below.
In the first rectangle I want to change it in:
31 Answers
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