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Java synchronized static methods: lock on object or class
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One point you have to be careful about (several programmers generally fall in that trap) is that there is no link between synchronized static methods and sync'ed non static methods, ie:
class A {
static synchronized f() {...}
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Finding all objects that have a given property inside a collection [duplicate]
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You could write a method that takes an instance of an interface which defines a check(Cat) method, where that method can be implemented with whatever property-checking you want.
Better yet, make it generic:
public interface Checker<T> {
public boolean check(T obj);
}...
MySQL case insensitive select
...T utf8 COLLATE utf8_bin;
-- or change table collation
ALTER TABLE `table` CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin;
-- or change column collation
ALTER TABLE `table` CHANGE `Value`
`Value` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_bin;
Your comparisons should now be case-sensitive....
javax vs java package
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Yup. I wrote a tool in Visual Cafe to convert between the two (javax and java) before Sun decided to just keep it in the javax package.
– TofuBeer
May 10 '11 at 20:34
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In C#, how to instantiate a passed generic type inside a method?
...me)
where T : IPerson, new()
Notice the additional constraint at the end. Then create a new instance in the method body:
T obj = new T();
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How to initialize a dict with keys from a list and empty value in Python?
...Moreover, defaultdict is a subclass of dict, so there's usually no need to convert back to a regular dictionary.
For workflows where you require controls on permissible keys, you can use dict.fromkeys as per the accepted answer:
d = dict.fromkeys([1, 2, 3, 4])
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How do I apply a diff patch on Windows?
...CR/LF). Try to open the patchfile in a reasonably smart editor and it will convert it for you.
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How to execute a stored procedure within C# program
...(SqlConnection conn = new SqlConnection("Server=(local);DataBase=Northwind;Integrated Security=SSPI")) {
conn.Open();
// 1. create a command object identifying the stored procedure
SqlCommand cmd = new SqlCommand("CustOrderHist", conn);
// 2. set the command object so it knows to...
Reading CSV file and storing values into an array
...ile twice)
You can store values in two List<T> and then use them or convert into an array using List<T>.ToArray()
Very simple example:
var column1 = new List<string>();
var column2 = new List<string>();
using (var rd = new StreamReader("filename.csv"))
{
while (!rd.End...
How can I handle the warning of file_get_contents() function in PHP?
...ce, way at the top (in an included config file, for instance), and it will convert all your errors to Exceptions throughout.
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