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Group a list of objects by an attribute : Java
...ew HashMap<Integer, List<Student>>();
Iterate over this code and add students to the HashMap:
if (!hashMap.containsKey(locationId)) {
List<Student> list = new ArrayList<Student>();
list.add(student);
hashMap.put(locationId, list);
} else {
hashMap.get(loca...
A list of indices in MongoDB?
...
And if you want to get list of all indexes in your database:
use "yourdbname"
db.system.indexes.find()
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How to un-escape a backslash-escaped string?
...on literal structures: strings, numbers, tuples, lists,
dicts, booleans, and None. (END)
Like this:
>>> import ast
>>> escaped_str = '"Hello,\\nworld!"'
>>> print ast.literal_eval(escaped_str)
Hello,
world!
...
JavaScript, get date of the next day [duplicate]
... Date().setDate(new Date().getDate() + 1));
– Björn Andreasson
May 22 '19 at 7:43
...
How to see if an object is an array without using reflection?
How can I see in Java if an Object is an array without using reflection?
And how can I iterate through all items without using reflection?
...
No Exception while type casting with a null in java
...ally print methods call String.valueOf(object) method on the input object. And in valueOf method, this check helps to avoid null pointer exception:
return (obj == null) ? "null" : obj.toString();
For rest of your confusion, calling any method on a null object should throw a null pointer exception...
High Quality Image Scaling Library [closed]
...'s a nicely commented Image Manipulation helper class that you can look at and use. I wrote it as an example of how to perform certain image manipulation tasks in C#. You'll be interested in the ResizeImage function that takes a System.Drawing.Image, the width and the height as the arguments.
usi...
C++ “virtual” keyword for functions in derived classes. Is it necessary?
...rence between them other than that the first approach requires more typing and is potentially clearer.
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How to convert JSON to a Ruby hash
...'m surprised nobody pointed out JSON's [] method, which makes it very easy and transparent to decode and encode from/to JSON.
If object is string-like, parse the string and return the parsed result as a Ruby data structure. Otherwise generate a JSON text from the Ruby data structure object and r...
I get a “An attempt was made to load a program with an incorrect format” error on a SQL Server repli
...llow 32bit applications.
Open up IIS Manager, right click on the app pool, and select Advanced Settings (See below)
Then set "Enable 32-bit Applications" to True.
All done!
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