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Get OS-level system information
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You can get some limited memory information from the Runtime class. It really isn't exactly what you are looking for, but I thought I would provide it for the sake of completeness. Here is a small example. Edit: You can also get disk usage...
Adding :default => true to boolean in existing Rails column
I've seen a few questions (namely this one ) here on SO about adding a default boolean value to an existing column. So I tried the change_column suggestion but I mustn't be doing it right.
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Convert a string representation of a hex dump to a byte array using Java?
...s.charAt(i+1), 16));
}
return data;
}
Reasons why it is an improvement:
Safe with leading zeros (unlike BigInteger) and with negative byte values (unlike Byte.parseByte)
Doesn't convert the String into a char[], or create StringBuilder and String objects for every single byte.
No library...
Filter by property
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bad luck that this feature is not implemented, would be an interesting extension to at least filter out matching objects after the resultset has been build.
– schneck
Jul 30 '09 at 9:24
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How to pull specific directory with git
...irectory, like myproject/javascript just like subversion does.
make some changes, commit and push back again.
It's possible?
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Volatile boolean vs AtomicBoolean
...n concurrently, i might be 5 afterwards, since the compiled code will be somewhat similar to this (except you cannot synchronize on int):
void incIBy5() {
int temp;
synchronized(i) { temp = i }
synchronized(i) { i = temp + 5 }
}
If a variable is volatile, every atomic access to it is ...
How do I resolve ClassNotFoundException?
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Depending on how you start your application, you need to revise the argument to -cp, your Class-Path entry in MANIFEST.MF or your disk layout.
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How do I output the difference between two specific revisions in Subversion?
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How can I tell jackson to ignore a property for which I don't have control over the source code?
Long story short, one of my entities has a GeometryCollection that throws an exception when you call "getBoundary" (the why of this is another book, for now let's say this is the way it works).
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Insert the carriage return character in vim
I'm editing a network protocol frame stored a file in Unix ( \n newlines). I need to insert the carriage return character ( U+000D aka \r ). When I try to paste it from the clipboard ( "+p ) or type it using Ctrl + Shift + u - 000d , the linefeed is inserted ( U+000A ).
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