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How to check type of variable in Java?
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Java is a statically typed language, so the compiler does most of this checking for you. Once you declare a variable to be a certain type, the compiler will ensure that it is only ever assigned values of that type (or values that are sub-types of that type).
The exam...
Quick way to list all files in Amazon S3 bucket?
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I'd recommend using boto. Then it's a quick couple of lines of python:
from boto.s3.connection import S3Connection
conn = S3Connection('access-key','secret-access-key')
bucket = conn.get_bucket('bucket')
for key in bucket.list():...
Convert Iterator to ArrayList
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Better use a library like Guava:
import com.google.common.collect.Lists;
Iterator<Element> myIterator = ... //some iterator
List<Element> myList = Lists.newArrayList(myIterator);
Another Guava example:
ImmutableList.copyOf(myIterator);
or Apache C...
SQL Server Insert if not exists
...t connection executes the INSERT, i.e. a race condition. See stackoverflow.com/a/3791506/1836776 for a good answer on why even wrapping in a transaction doesn't solve this.
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“Content is not allowed in prolog” when parsing perfectly valid XML on GAE
...'utf-16'?>
Another possible scenario that causes this is when anything comes before the XML document type declaration. i.e you might have something like this in the buffer:
helloworld<?xml version="1.0" encoding="utf-8"?>
or even a space or special character.
There are some special...
Google Guava isNullOrEmpty for collections
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Handlebars/Mustache - Is there a built in way to loop through the properties of an object?
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Pass a PHP string to a JavaScript variable (and escape newlines) [duplicate]
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If you're not 5.2, try jsonwrapper from boutell.com boutell.com/scripts/jsonwrapper.html
– Tom Auger
Dec 22 '10 at 22:57
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Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
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How to convert an Array to a Set in Java
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In Java 10+, the generic type parameter can be inferred from the arrays component type:
var mySet = Set.of(someArray);
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