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Java: How to convert List to Map
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List<Item> list;
Map<Key,Item> map = new HashMap<Key,Item>();
for (Item i : list) map.put(i.getKey(),i);
Assuming of course that each Item has a getKey() method that returns a key of the proper type.
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When to use Cast() and Oftype() in Linq
...EDIT
for example:
object[] objs = new object[] { "12345", 12 };
objs.Cast<string>().ToArray(); //throws InvalidCastException
objs.OfType<string>().ToArray(); //return { "12345" }
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What does (angle brackets) mean in Java?
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<T> is a generic and can usually be read as "of type T". It depends on the type to the left of the <> what it actually means.
I don't know what a Pool or PoolFactory is, but you also mention ArrayList<T>, wh...
Get nested JSON object with GSON using retrofit
...ou write a deserializer:
class MyDeserializer implements JsonDeserializer<Content>
{
@Override
public Content deserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
throws JsonParseException
{
// Get the "content" element from the parsed JSON
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Copy a stream to avoid “stream has already been operated upon or closed”
...gate operations without a lot of accidental detail (e.g., intermediate results) in the way of reading the code. They are also efficient, in that they (generally) make a single pass on the data and do not populate intermediate result containers. These two properties together make them an attractive...
Identify duplicates in a List
...e Set documentation).
So just iterate through all the values:
public Set<Integer> findDuplicates(List<Integer> listContainingDuplicates)
{
final Set<Integer> setToReturn = new HashSet<>();
final Set<Integer> set1 = new HashSet<>();
for (Integer yourInt ...
Having links relative to root?
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A root-relative URL starts with a / character, to look something like <a href="/directoryInRoot/fileName.html">link text</a>.
The link you posted: <a href="fruits/index.html">Back to Fruits List</a> is linking to an html file located in a directory named fruits, the dire...
Is div inside list allowed? [duplicate]
...cording to xhtml1-strict.dtd. The following XHTML passes the validation:
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<...
LINQ: Distinct values
...y as implemented in MoreLINQ in DistinctBy.cs:
public static IEnumerable<TSource> DistinctBy<TSource, TKey>(
this IEnumerable<TSource> source,
Func<TSource, TKey> keySelector,
IEqualityComparer<TKey> comparer)
{
HashSet<TKey> knownKeys = new...
Hidden features of Python [closed]
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Chaining comparison operators:
>>> x = 5
>>> 1 < x < 10
True
>>> 10 < x < 20
False
>>> x < 10 < x*10 < 100
True
>>> 10 > x <= 9
True
>>> 5 == x > 4
True
In case you're thinking it's doing 1 < x, which ...