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Eclipse says: “Workspace in use or cannot be created, chose a different one.” How do I unlock a work
...e cause of the “Workspace in use or cannot be created, chose a different one” issue is that the real path to your workspace may have changed.
In my case, the real location of the workspace had changed, but I had used a symlink to make it look like it was in the same location. I saw errors in l...
How to find the duration of difference between two dates in java?
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This answer ignores time zones which define the beginning and ending of days. This answer ignores Daylight Saving Time and other anomalies that mean a day is not always 24 hours in length. See the correct answers that use either Joda-Time or java.time...
What does `m_` variable prefix mean?
...ssumed to be getName/setName, so getM_name is bad and you need handle them one by one.
– Leon
Jan 11 '19 at 5:53
Thank...
Which Radio button in the group is checked?
...t be necessary. When you check a different RadioButton then it knows which one to uncheck… so it should know which is checked. How do I pull that information without doing a lot of if statements (or a switch).
...
Eloquent Collection: Counting and Detect Empty
...model, or null otherwise. This is useful if you need or are expecting only one result from the database.
$result = Model::where(...)->first();
if ($result) { ... }
Notes / References
->first() http://laravel.com/api/4.2/Illuminate/Database/Eloquent/Collection.html#method_first
isEmpty() h...
Why did my Git repo enter a detached HEAD state?
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Any checkout of a commit that is not the name of one of your branches will get you a detached HEAD. A SHA1 which represents the tip of a branch still gives a detached HEAD. Only a checkout of a local branch name avoids that mode.
See committing with a detached HEAD
Whe...
How is Docker different from a virtual machine?
... you can have a read only part and a write part which are merged together. One could have the common parts of the operating system as read only (and shared amongst all of your containers) and then give each container its own mount for writing.
So, let's say you have a 1 GB container image; if you ...
What's the difference between SoftReference and WeakReference in Java?
...renced by a SoftReference if there isn't pressure on the available memory. One detail: the policy for the "-client" and "-server" JRE's are different: the -client JRE tries to keep your footprint small by preferring to clear SoftReferences rather than expand the heap, whereas the -server JRE tries t...
Get properties and values from unknown object
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@clone that's a completely different way of doing it. You should post an answer if you think it's a valid approach
– Cocowalla
Jul 22 '17 at 7:31
...
How to detect a Christmas Tree? [closed]
...with many of the other answers, I assumed that the Christmas tree would be one of the brighter objects in the scene, so the first threshold is just a simple monochrome brightness test; any pixels with values above 220 on a 0-255 scale (where black is 0 and white is 255) are saved to a binary black-a...