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Closing Database Connections in Java
...close() method in order to release any other database resources (cursors, handles, etc) the connection may be holding on to.
Actually, the safe pattern in Java is to close your ResultSet, Statement, and Connection (in that order) in a finally block when you are done with them, something like that:...
Set margin size when converting from Markdown to PDF with pandoc
I have created an RMarkdown file in RStudio and managed to knit it with knitr into an HTML and .md file. Next, I used pandoc to convert the .md file into a PDF file (I get an error if I try and convert from the .html file). However, the PDF that is produced have massive margins (like this http://...
Maven: best way of linking custom external JAR to my project?
It's my first couple of days learning Maven and I'm still struggling with the basics. I have an external .jar file (not available in the public repos) that I need to reference in my project and I'm trying to figure out what my best option is.
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Is it possible to send an array with the Postman Chrome extension?
I've been using Postman Chrome extension to test out my API and would like to send an array of IDs via post. Is there a way to send something list this as a parameter in Postman?
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Can't execute jar- file: “no main manifest attribute”
...un it (it's an executable jar) nothing happens. When I run it from the commandline with:
39 Answers
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How to get enum value by string or int
...Johannes What do you mean by that? There is a generic way, refer my answer and others too.
– Sriram Sakthivel
May 9 '14 at 12:39
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How do I generate random integers within a specific range in Java?
How do I generate a random int value in a specific range?
66 Answers
66
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How to efficiently build a tree from a flat structure?
I have a bunch of objects in a flat structure. These objects have an ID and a ParentID property so they can be arranged in trees. They are in no particular order.
Each ParentID property does not necessarily matches with an ID in the structure. Therefore their could be several trees emerging ...
Android Bitmap to Base64 String
...s for solution, i have used same code but my encoded string has ... in end and i think it is not converted completely so please tell me why in end of Base 64 string are the dots(...)..
– Pankaj Singh
Feb 10 '12 at 7:26
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Are strongly-typed functions as parameters possible in TypeScript?
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Sure. A function's type consists of the types of its argument and its return type. Here we specify that the callback parameter's type must be "function that accepts a number and returns type any":
class Foo {
save(callback: (n: number) => any) : void {
callback(42);
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