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What is the concept of erasure in generics in Java?
...ns that the type information which is present in the source code is erased from the compiled bytecode. Let us understand this with some code.
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class GenericsErasure {
public static void main(String args[]) {
...
Rspec doesn't see my model Class. uninitialized constant error
... for tests that are going to be testing Rails capabilities should be moved from spec_helper.rb into rails_helper.rb. Also, be sure to read the comments in rails_helper.rb that mention how rspec-rails can infer_spec_type_from_file_location, which might make you relocate your spec tests into different...
Automapper - how to map to constructor parameters instead of property setters
...lly mapped according to the conventions.
Also note that this is different from ConvertUsing in that convert using will not continue to map via the conventions, it will instead give you full control of the mapping.
Mapper.CreateMap<ObjectFrom, ObjectTo>()
.ConstructUsing(x => new Objec...
Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
...t merge，合并上游分支来更新本地代码。
$ git fetch
From https://github.com/chaconinc/DbConnector
c3f01dc..d0354fc master -> origin/master
$ git merge origin/master
Updating c3f01dc..d0354fc
Fast-forward
scripts/connect.sh | 1 +
src/db.c | 1 +
2 fil...
How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
...rything but we choose only to process the submission data if its different from the data sent last time (which we store in the session var 'messageIdent'). Are you processing your form submission within the 'if messageIdents are different' clause (ie where 'do_your_thang()' is)?
...
Simpler way to put PDB breakpoints in Python code?
...
You can run your program into pdb from the command line by running
python -m pdb your_script.py
It will break on the 1st line, then you'll be able to add a breakpoint wherever you want in your code using the break command, its syntax is:
b(reak) [[f...
Getting the name of the currently executing method
...read().getStackTrace() will usually contain the method you’re calling it from but there are pitfalls (see Javadoc):
Some virtual machines may, under some circumstances, omit one or more stack frames from the stack trace. In the extreme case, a virtual machine that has no stack trace informatio...
Convert string to Python class object?
...cation of using eval. You better make sure the string you passed in is not from user.
– Overclocked
Jul 18 '13 at 13:32
18
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APT command line interface-like yes/no input?
...t() (or simply input() for Python 3). There is no built-in way to do this. From Recipe 577058:
import sys
def query_yes_no(question, default="yes"):
"""Ask a yes/no question via raw_input() and return their answer.
"question" is a string that is presented to the user.
"default" is the...
How do I make JavaScript beep?
...eight="0" id="sound1"
enablejavascript="true">
You would then call it from JavaScript code as such:
PlaySound("sound1");
This should do exactly what you want - you'll just need to find/create the beep sound yourself, which should be trivial.
...