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Java heap terminology: young, old and permanent generations?

I'm trying to understand What the concepts of young , old and permanent generations are in the Java heap terminology, and more specifically the interactions between the three generations. ...
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Xcode 6 beta 2 issue exporting .ipa: “Your account already has a valid iOS distribution certificate”

... This is what worked for me. On my machine I kept both Xcode 5 and Xcode 6 beta. From Xcode 6 beta, Archive the project. Close Xcode 6. Open Xcode 5, go to Organizer and export as Ad Hoc build with proper provisioning profile. That's it! ...
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What are C++ functors and their uses?

...about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful? 14 Answe...
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Are static variables shared between threads?

...y the JVM's memory model. Here's an article talking about the memory model and how writes become visible to threads. You can't count on changes one thread makes becoming visible to other threads in a timely manner (actually the JVM has no obligation to make those changes visible to you at all, in an...
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Difference between jar and war in Java

What is the difference between a .jar and a .war file? Is it only the file extension or is there something more? 13 A...
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Maintain/Save/Restore scroll position when returning to a ListView

... Try this: // save index and top position int index = mList.getFirstVisiblePosition(); View v = mList.getChildAt(0); int top = (v == null) ? 0 : (v.getTop() - mList.getPaddingTop()); // ... // restore index and position mList.setSelectionFromTop(in...
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Freezing Row 1 and Column A at the same time

I want to "freeze" Row 1 and Column A simultaneously in Excel 2010. 1 Answer 1 ...
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What is the difference between pylab and pyplot? [duplicate]

What is the difference between matplotlib.pyplot and matplotlib.pylab? 1 Answer 1 ...
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Why is Thread.Sleep so harmful

...it mentioned that Thread.Sleep(); should not be used, but I can't understand why this is so. If Thread.Sleep(); can cause trouble, are there any alternative solutions with the same result that would be safe? ...
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Rails migration for has_and_belongs_to_many join table

...ow do I do a script/generate migration to create a join table for a has_and_belongs_to_many relationship? 6 Answers ...