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Java 8 functional interface with no arguments and no return value
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Fleshing out @jpangamarca's "Oops" above: In the comments on the duplicate question he linked, Brian Goetz confirmed that Runnable was intended to be used for this purpose, not just for threading contexts.
– Jos...
Eclipse will not start and I haven't changed anything
... -clearPersistedState and that worked for me. You will lose your window layout configuration, but that seems minor to me.
For Linux systems try: ./eclipse -clean -clearPersistedState
See Eclipse JUNO doesn't start
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Calculating distance between two points, using latitude longitude?
...(double rad) {
return (rad * 180.0 / Math.PI);
}
System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, 'M') + " Miles\n");
System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, 'K') + " Kilometers\n");
System.out.println(distance(32.9697, -96....
Entity Framework - Invalid Column Name '*_ID"
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Check to see if you have any ICollections.
What I have figured out is when you have an ICollection that references a table and there is no column that it can figure out, it creates one for you to try to make the connection between the tables. This specifically happens with ICollection a...
Python to print out status bar and percentage
...e line.
from time import sleep
import sys
for i in range(21):
sys.stdout.write('\r')
# the exact output you're looking for:
sys.stdout.write("[%-20s] %d%%" % ('='*i, 5*i))
sys.stdout.flush()
sleep(0.25)
I'm not 100% sure if this is completely portable across all systems, but ...
How do I best silence a warning about unused variables?
... Just #define UNUSED(expr) (void)(expr) should work too (without the do-while).
– JonnyJD
Feb 17 '14 at 13:02
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How do I convert dates in a Pandas data frame to a 'date' data type?
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Use astype
In [31]: df
Out[31]:
a time
0 1 2013-01-01
1 2 2013-01-02
2 3 2013-01-03
In [32]: df['time'] = df['time'].astype('datetime64[ns]')
In [33]: df
Out[33]:
a time
0 1 2013-01-01 00:00:00
1 2 2013-01-02...
Add object to ArrayList at specified index
I think it's a fairly simple question, but I can't figure out how to do this properly.
14 Answers
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What is the memory consumption of an object in Java?
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Mindprod points out that this is not a straightforward question to answer:
A JVM is free to store data any way it pleases internally, big or little endian, with any amount of padding or overhead, though primitives must behave as if they ...
How to convert a private key to an RSA private key?
... traditional OpenSSL format) you can do this:
openssl rsa -in server.key -out server_new.key
Alternately, if you have a PKCS1 key and want PKCS8:
openssl pkcs8 -topk8 -nocrypt -in privkey.pem
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