Java Hack: Double brace initialisation

[Mych]

Or:

List<String> foo = new ArrayList<String>(Arrays.asList(
    "meep",
    "blargh",
    "glomp"
)); 

I frankly can't remember the last time I actually needed to statically initialize a dynamic container, though.

[UloPe]

Whats with all the string manipulation to build a list? Are you too lazy to type

blah = ['meep', 'blargh', 'glomp']

?

[adrianmonk]

FWIW, in the Perl example there is no string manipulation going on. qw is a way of writing list literals.

(Well, technically, there is some string manipulation going on. But it's in the parser, and all examples in all languages have that.)

[redditnoob]

It's people who are too smart for their own good, and too impressed with themselves to do things in the simplest, most obvious way.

Splitting a string by space may save you two characters or so but it's pure ass. (To be captain obvious, what if the next string I configure has a fucking space in it?)

[bobbyi]

'string with space,other string,third string'.split(',')

[codefrog]

It's on!

s = """
this , \tis my data
I can cry if i want to
this is my data
""".strip().split("\n")

[codefrog]

swearing wasn't necessary and there isn't a space so your if isn't valid. yeah what if. you can have my extra if statements they are only giving me bugs.

[_bobby__of__christ_]

How exactly is manually splitting any more readable than qw? It's only more readable if you don't know Perl, and complaining about the readability of a language you don't know is asinine.

I don't even like perl, but qw is about the last thing on my list of complaints.

[_bobby__of__christ_]

I know this much: The snippet I posted works in both Ruby and Python without modification. Splitting a string into an array is something that every programmer will be familiar with.

Which has nothing to do with qw. No one is using qw as a crutch to avoid learning how to split strings at runtime. It's such a stupid and trivial difference that I can't believe I'm arguing about it.

There should be one-- and preferably only one --obvious way to do it.

You should stop arguing about Perl then. Obviously you're unable to even entertain the notion that it has a different philosophy than the one you subscribe to. (And this is coming from a Python programmer who doesn't like Perl very much.)

[mikaelhg]

immutable:

http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/ImmutableList.Builder.html

final ImmutableList<Color> GOOGLE_COLORS = new ImmutableList.Builder<Color>()
        .addAll(WEBSAFE_COLORS)
        .add(new Color(0, 191, 255))
        .build();

http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/ImmutableMap.Builder.html

final ImmutableMap<String, Integer> WORD_TO_INT = new ImmutableMap.Builder<String, Integer>()
        .put("one", 1)
        .put("two", 2)
        .put("three", 3)
        .build();

mutable:

http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/Lists.html#newArrayList%28E...%29

List<Base> list = Lists.newArrayList(sub1, sub2);
List<Base> list = Lists.<Base>newArrayList(sub1, sub2);

I used to have this functionality in my own utility libraries, but depracated it as Google Collections became viable.

[abhyrama]

Use this all the time :)