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Does setting Java objects to null do anything anymore?

I was browsing some old books and found a copy of "Practical Java" by Peter Hagger. In the performance section, there is a recommendation to set object references to null when no longer needed. ...
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Adding div element to body or document in JavaScript

... but it also removes the current contents in body. How to add div element and keep contents on body? 9 Answers ...
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Can I checkout github wikis like a git repository?

I want to modify and view github wikis with local editor like Emacs, and Google Code wikis can be checked out just like code. Is there any way to checkout github wikis? Or is there any other git repository provider offers such feature? ...
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What are the differences between .gitignore and .gitkeep?

What are the differences between .gitignore and .gitkeep ? Are they the same thing with a different name, or do they both serve a different function? ...
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Grep regex NOT containing string

...p to check against a syslog file. They are usually matching an IP address and log entry; 3 Answers ...
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Android SharedPreference security

...as the creating app would be able to access them (this is not usually done and you need to take specific action to make two apps runs with the same UID, so this is probably not a big concern). Finally, if someone was able to mount your device's filesystem without using the installed Android OS, they...
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Generating Random Passwords

When a user on our site loses his password and heads off to the Lost Password page we need to give him a new temporary password. I don't really mind how random this is, or if it matches all the "needed" strong password rules, all I want to do is give them a password that they can change later. ...
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HTML5 doctype putting IE9 into quirks mode?

I'm trying to get IE9 to load my page with IE9 standards... 5 Answers 5 ...
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Selenium: FirefoxProfile exception Can't load the profile

...o selenium where I am getting this error because I'm trying to use a proxy and only 2 of the 4 configured changes in the profile have been accepted by firefox, so the proxy isn't configured to talk to the extension. Not sure why this is happening... https://github.com/seleniumhq/selenium-google-cod...
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Does Ruby have a string.startswith(“abc”) built in method?

...ot String#startswith: In Ruby, the names of boolean-ish methods end with ? and the words in method names are separated with an _. Not sure where the s went, personally, I'd prefer String#starts_with? over the actual String#start_with? ...