Java

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IO Benchmarks

Pas de commentaires 11/02/2010 zetom No comments

Since long, I know there is buffered flows when reading or writing that ... yes, but the question I often asked is "how much? What is the order of magnitude? ".

So I made a quick benchmark for, measures of that performance gain ... and it boggles the mind! I get the factors of 22 in reading and 35 in writing!

continue reading ...

Remove dead code

Pas de commentaires 15/10/2009 zetom No comments

cleanup Fact: a large application developed and maintained by several people, we ended up having a lot of dead code ...

One solution is to use the clean up of Eclipse, one arrives to remove some unused attributes ... but it does not go much further.

The idea would be much more radical: a tool to pass on all the code.

Fortunately (again), Eclipse just save your life

Let's start by downloading Eclipse Core Tools: http://www.eclipse.org/eclipse/platform-core/updates/
Select Project / package / class on which to pass the tool
Via the shortcut menu, click Find Unreferenced Members. The search result is displayed in the Search View
Get the ax ...

By cons, beware: it is possible that some classes appear to be unused when they are called by an extension point!

Eclipse , Java clean , code , death , cleansing

Hide password in a Java application

Pas de commentaires 22/07/2009 zetom No comments

images I've always wondered how to, in an app "command line" Java, hide his password (eg ssh).

The solution comes with the JDK 6 and the class Console which allows (among others) to retrieve an entry without displaying what went ...

Here is a quick snippet putting into practice this class:

Import java.io.Console;

(public class TestConsole
main ( String [ ] args ) { public static void main (String [] args) (
( ) ; Console lConsole = System. Console ();
. print ( "Username: " ) ; System. Out. Print ("Username:");
( ) ; String username = lConsole. ReadLine ();
. print ( "Password: " ) ; System. Out. Print ("Password:");
String ( lConsole. readPassword ( ) ) ; String password = new String (lConsole. readPassword ());
. println ( "Username: " + username ) ; System. Out. System.out.println ("Username:" username +);
. println ( "Password: " + password ) ; System. Out. System.out.println ("Password:" + password);
)
)