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How to tell if JRE or JDK is installed

... tried it on another, it complained that JDK was required. How can I check if JDK was somehow installed on my system? Note: the computer in question is a Mac. ...
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How to sort with a lambda?

... What you have written so far makes little sense. If mProperty is supposed to be an int a.mProperty>b.mProperty will definitely yield a bool. – sellibitze Feb 26 '11 at 0:32 ...
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What is “callback hell” and how and why does RX solve it?

... example that explains what is a "callback hell" for someone who does not know JavaScript and node.js ? 8 Answers ...
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How to keep environment variables when using sudo

...r setting HTTP_PROXY the command wget works fine without sudo . However if I type sudo wget it says it can't bypass the proxy setting. ...
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How to print a groupby object

... key_list_from_gb = [key1, key2, key3] for key, values in gb.items(): if key in key_list_from_gb: print(df.ix[values], "\n") share | improve this answer | follo...
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How do you check whether a number is divisible by another number (Python)?

...e if and only if n is an exact multiple of k. In elementary maths this is known as the remainder from a division. In your current approach you perform a division and the result will be either always an integer if you use integer division, or always a float if you use floating point division. It...
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Wildcards in jQuery selectors

... What if, I want to select the Even of those selected. for instance: I currently have .col-lg-4:even div:nth-child(1) if I wanted to do the same.... what would I write? "[class^=.col-lg-]:even"? (I don't seem to make it work) ...
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System.Threading.Timer in C# it seems to be not working. It runs very fast every 3 second

I've a timer object. I want it to be run every minute. Specifically, it should run a OnCallBack method and gets inactive while a OnCallBack method is running. Once a OnCallBack method finishes, it (a OnCallBack ) restarts a timer. ...
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How to get JQuery.trigger('click'); to initiate a mouse click

...xpense_tickets value is changed, and also, when page is reload }); // now we trigger the change event $("#expense_tickets").trigger("change"); }) share | improve this answer | ...
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Streaming Audio from A URL in Android using MediaPlayer?

...st tried commenting-out the "mediaPlayer.release()" line in onPause(), and now my app doesn't crash upon unlocking. – CiaranC94 Jul 21 '16 at 10:17 ...