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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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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...
Iterate through a HashMap [duplicate]
What's the best way to iterate over the items in a HashMap ?
7 Answers
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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 ...
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...
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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Can I catch multiple Java exceptions in the same catch clause?
...tch both ExceptionA and ExceptionB in the same block if ExceptionB is inherited, either directly or indirectly, from ExceptionA. The compiler will complain:
Alternatives in a multi-catch statement cannot be related by subclassing
Alternative ExceptionB is a subclass of alternative ExceptionA
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About Java cloneable
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The first thing you should know about Cloneable is - don't use it.
It is very hard to implement cloning with Cloneable right, and the effort is not worth it.
Instead of that use some other options, like apache-commons SerializationUtils (deep-clone) or BeanUtils (shallow-clone), or sim...
Is it a bad practice to catch Throwable?
Is it a bad practice to catch Throwable ?
14 Answers
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