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Map implementation with duplicate keys
...ions external library. You can simply implement the following Map:
Map<String, ArrayList<String>> hashMap = new HashMap<String, ArrayList>();
public static void main(String... arg) {
// Add data with duplicate keys
addValues("A", "a1");
addValues("A", "a2");
addValues...
How to get the filename without the extension in Java?
...e, you can use the following:
import org.apache.commons.io.FilenameUtils;
String fileNameWithOutExt = FilenameUtils.removeExtension(fileNameWithExt);
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How to perform a mysqldump without a password prompt?
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To use a file that is anywhere inside of OS, use --defaults-extra-file eg:
mysqldump --defaults-extra-file=/path/.sqlpwd [database] > [desiredoutput].sql
Note: .sqlpwd is just an example filename. You can use whatever you desire.
Note: MySQL will automatically check for ~/.my....
What exactly is a C pointer if not a memory address?
...y a real memory address. This ID could be anything, even a fixed-size text string. Non-address representations may be especially useful for a C interpreter.
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Easiest way to read from and write to files
...and File.WriteAllText.
MSDN example excerpt:
// Create a file to write to.
string createText = "Hello and Welcome" + Environment.NewLine;
File.WriteAllText(path, createText);
...
// Open the file to read from.
string readText = File.ReadAllText(path);
...
How to do ToString for a possibly null object?
...# 6.0 we can now have a succinct, cast-free version of the orignal method:
string s = myObj?.ToString() ?? "";
Or even using interpolation:
string s = $"{myObj}";
Original Answer:
string s = (myObj ?? String.Empty).ToString();
or
string s = (myObjc ?? "").ToString()
to be even more concise.
Unfo...
Using Enum values as String literals
What is the best way to use the values stored in an Enum as String literals?
For example:
18 Answers
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What's the point of 'const' in the Haskell Prelude?
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Say you want to create a list of Nothings equal to the length of a string. As const returns its first argument, no matter the second, you can do:
listOfNothings :: String -> [Maybe Char]
listOfNothings = (map . const) Nothing
or, more explicitly:
listOfNothing st = map (const Nothing)...
Auto increment primary key in SQL Server Management Studio 2012
...ment and seed.
Edit: I assumed that you'd have an integer datatype, not char(10). Which is reasonable I'd say and valid when I posted this answer
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postgresql port confusion 5433 or 5432?
...re running Postgres.app or homebrew Pg and connecting with the psql that shipped with the OS. Not only do these sometimes have different default ports, but the Pg that shipped with Mac OS X has a different default unix socket path, so even if the server is running on the same port it won't be liste...