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Pick a random value from an enum?
...it in a public method the caller can modify it and it modifies the private filed so you need to defensively copy the array. If you call that method lots of times it can be a problem so you put it in an immutable list instead to avoid unnecessary defensive copying.
– cletus
...
Jackson serialization: ignore empty values (or null)
...onInclude(JsonInclude.Include.NON_NULL)
Using above annotation either on filed or class level was not working as expected. The POJO was mutable where I was applying the annotation. When I changed the behaviour of the POJO to be immutable the annotation worked its magic.
I am not sure if its down...
No identities are available for signing Xcode 5
... my app in Xcode 5. I tried all: Recreate certificates and provisioning profiles, all methods which have been described on this site and another resources; I'm confused, because when I try to distribute my app as Ad-hoc, it successfully create and install on test device an IPA file. But when I try v...
How to extract the first two characters of a string in shell scripting?
...
colrm — remove columns from a file
To leave first two chars, just remove columns starting from 3
cat file | colrm 3
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How to get ERD diagram for an existing database?
...s wiki page, which includes helpful tips for layout and exporting to image file format:
– dpmott
Jun 24 '19 at 20:24
...
Difference between len() and .__len__()?
..._()
'an inch'
>>> len(bah())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'str' object cannot be interpreted as an integer
When you see a call to the len built-in, you're sure that, if the program continues after that rather than raising ...
App Inventor 2 App上架国内应用市场完整指南 · App Inventor 2 中文网
...能的需要申请安全认证
原生 WebView 套网页时，input file 可能失效导致上传功能不可用，需注意兼容处理
3.2 腾讯应用宝
开发者入口：https://app.open.qq.com/p/developer/team_manage/info
特点：与微信、QQ深...
How do I handle the window close event in Tkinter?
...())
# create a menu bar with an Exit command
menubar = tkinter.Menu(root)
filemenu = tkinter.Menu(menubar, tearoff=0)
filemenu.add_command(label="Exit", command=root.destroy)
menubar.add_cascade(label="File", menu=filemenu)
root.config(menu=menubar)
# create a Text widget with a Scrollbar attached...
Is there a way to instantiate a class by name in Java?
... I don't understand this. I want to access a class in an unknown file in some other directory, I only have the name of the path/file as a string. String "dir/unkonwn.java". Calling Class.forName("dir/unknown") gives me errors.
– john ktejik
Feb 27 '...
How do I resize an image using PIL and maintain its aspect ratio?
...he PIL documentation.
import os, sys
import Image
size = 128, 128
for infile in sys.argv[1:]:
outfile = os.path.splitext(infile)[0] + ".thumbnail"
if infile != outfile:
try:
im = Image.open(infile)
im.thumbnail(size, Image.ANTIALIAS)
im.save(out...