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Should I store entire objects, or pointers to objects in containers?
... you're storing polymporhic objects you always need to use a collection of base class pointers.
That is if you plan on storing different derived types in your collection you must store pointers or get eaten by the slicing deamon.
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HashSet vs LinkedHashSet
... answer lies in which constructors the LinkedHashSet uses to construct the base class:
public LinkedHashSet(int initialCapacity, float loadFactor) {
super(initialCapacity, loadFactor, true); // <-- boolean dummy argument
}
...
public LinkedHashSet(int initialCapacity) {
super(init...
Navigation in django
...
I use template inheritance to customize navigation. For example:
base.html
<html>
<head>...</head>
<body>
...
{% block nav %}
<ul id="nav">
<li>{% block nav-home %}<a href="{% url home %}">Home</a>...
When to use enumerateObjectsUsingBlock vs. for
...he representation for fast enumeration. There is overhead therein. Block-based enumeration allows the collection class to enumerate contents as quickly as the fastest traversal of the native storage format. Likely irrelevant for arrays, but it can be a huge difference for dictionaries.
"Don't use...
Read properties file outside JAR file
...ng (depending on the current state of the program) since it is just a text-based file. For example, your main.properties file may contain:
app.version=1.0.0.0
app.name=Hello
So, when you run your main program from its root/base folder, normally you will run it like this:
java -jar ./main.jar
o...
How do I solve the INSTALL_FAILED_DEXOPT error?
...case after tinkering with jars. For me this was on Android 2.3 Gingerbread based devices only, ICS & Lollipop were fine.
– AlexVPerl
May 25 '15 at 0:53
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View the change history of a file using Git versioning
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If you prefer to stay text-based, you may want to use tig.
Quick Install:
apt-get: # apt-get install tig
Homebrew (OS X): $ brew install tig
Use it to view history on a single file: tig [filename]
Or browse detailed repo history: tig
Similar to...
Why java.lang.Object is not abstract? [duplicate]
Why is the Object class, which is base class of 'em all in Java, not abstract?
14 Answers
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How to filter files when using scp to copy dir recursively?
.../me.class the problem is, there are many other useless files such as .svn-base files that i don't want. how can i filter them so I only scp .class files?
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How can I write output from a unit test?
... formatting string (documented at docs.microsoft.com/en-us/dotnet/standard/base-types/…). To use a literal { in a string, you need to double it. To print your string use WriteLine("he{{ll}}o");
– Walter
Nov 7 '17 at 21:59
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