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Fix a Git detached head?

I was doing some work in my repository and noticed a file had local changes. I didn't want them anymore so I deleted the file, thinking I can just checkout a fresh copy. I wanted to do the Git equivalent of ...
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What does “var FOO = FOO || {}” (assign a variable or an empty object to that variable) mean in Java

Looking at an online source code I came across this at the top of several source files. 7 Answers ...
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python multithreading wait till all threads finished

This may have been asked in a similar context but I was unable to find an answer after about 20 minutes of searching, so I will ask. ...
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How to trigger an event after using event.preventDefault()

I want to hold an event until I am ready to fire it e.g 13 Answers 13 ...
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How to timeout a thread

I want to run a thread for some fixed amount of time. If it is not completed within that time, I want to either kill it, throw some exception, or handle it in some way. How can it be done? ...
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How do I tell Spring Boot which main class to use for the executable jar?

My project has more than one class with a main method. How do I tell the Spring Boot Maven plugin which of the classes it should use as the main class? ...
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How to load images dynamically (or lazily) when users scrolls them into view

I've noticed this in numerous "modern" websites (e.g. facebook and google image search) where the images below the fold load only when user scrolls down the page enough to bring them inside the visible viewport region ( upon view source, the page shows X number of <img> tags but they are not f...
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Adding a library/JAR to an Eclipse Android project

This is a two-part question about adding a third-party library (JAR) to an Android project in Eclipse. 8 Answers ...
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How to delete a file or folder?

How do I delete a file or folder in Python? 13 Answers 13 ...
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How to check if an option is selected?

Apparently, the isChecked doesn't work. SO my question is what is the proper way to do this? Thanks. 10 Answers ...