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What's the difference between and
...o retain compatibility with a pre-generics API that used Object.)
Source: http://download.oracle.com/javase/tutorial/extra/generics/convert.html; it explains why the JDK's java.util.Collections class has a method with this signature:
public static <T extends Object & Comparable<? super T...
What is the “assert” function?
...
C++11 N3337 standard draft
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf
19.3 Assertions
1 The header <cassert>, described in (Table 42), provides a macro for documenting C ++ program assertions
and a mechanism for disa...
Using multiple property files (via PropertyPlaceholderConfigurer) in multiple projects/modules
...to pass to others in the context without
throwing an exception
source: http://www.baeldung.com/2012/02/06/properties-with-spring/
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How do I get SUM function in MySQL to return '0' if no values are found?
...FROM table
WHERE ...
To see it in action, please see this sql fiddle: http://www.sqlfiddle.com/#!2/d1542/3/0
More Information:
Given three tables (one with all numbers, one with all nulls, and one with a mixture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT N...
Spark java.lang.OutOfMemoryError: Java heap space
...is larger than a few k or more than an MB, you may have a memory leak. See https://stackoverflow.com/a/25270600/1586965
Related to above; use broadcast variables if you really do need large objects.
If you are caching large RDDs and can sacrifice some access time consider serialising the RDD http://...
Android: How to bind spinner to custom object list?
...l
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:textSize="14sp"
android:textColor="#FFFFFF"
android:sp...
What is difference between sjlj vs dwarf vs seh?
...ro overhead exception) – will be available for 64-bit GCC 4.8.
source: http://qt-project.org/wiki/MinGW-64-bit
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Fast stable sorting algorithm implementation in javascript
...log if you want to know more about this technique and how to implement it: http://blog.vjeux.com/2010/javascript/javascript-sorting-table.html
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How to add a custom loglevel to Python's logging facility
... # This method was inspired by the answers to Stack Overflow post
# http://stackoverflow.com/q/2183233/2988730, especially
# http://stackoverflow.com/a/13638084/2988730
def logForLevel(self, message, *args, **kwargs):
if self.isEnabledFor(levelNum):
self._log(level...
How to extract public key using OpenSSL?
....
I did find in the AWS docs the following command works:
ssh-keygen -y
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html
edit
Thanks @makenova for the complete line:
ssh-keygen -y -f key.pem > key.pub
...