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Java Date and Time API and JSR-310

Dutch version can be found at the Finalist IT Group weblog.

Since the start of the development of JDK 7, there is quite some discussion on the API’s in the standard Java libraries which covers date and time. In the current Java version (1.6) there are roughly three major (groups of) classes which are responsible for handling date and time: Date and Calendar, the formatting classes, and the classes in the java.sql package, including java.sql.Date, java.sql.Time and java.sql.Timestamp. Most developers agree that these classes are far from perfect.

In order to resolve this issue, JSR-310 is started to improve the date and time API in the standard Java libraries. However, due to lack of developers and slow progress, it became very uncertain if the JSR would be ready for inclusion in JDK 7 (which will eventually become Java 7, the name I will use in the rest of this article). JSR-310 is lead by Stephan Colebourne and Michael Nascimento Santos. Colebourne is the original author of the increasingly popular Joda Time project, which is a replacement for the default Java date and time API’s. At Devoxx 2009, taking place last November, Mark Reinhold of Sun announced that Java 7 will be delayed until September 2010 at the earliest. Stephan Colebourne sees this as a opportunity to release at least a partially complete JSR-310 in time for the upcoming Java release. (more…)

Encoding in Scala interpreter

One of the nice things of Scala is the availability of a command line interpreter based on the REPL principle (Read-evaluate-print loop). Last week, for a particular project, I wanted to generate a string containing a part of the UTF-8 character table.
Thanks to Scala’s concise syntax, this would not be very difficult:

(0x20AC until 0x20B6).foreach { x => print(x.toChar + " ") }

This example will print characters 0x20AC (euro symbol) up to 0x20B6 (an unknown symbol to me :) ).

However, the result I got on my system (Mac OS X 10.6.2 using Scala 2.8 nightly) was not really what I expected:

? ? ? ? ? ? ? ? ? ?

(more…)

Java 7: new coffee

Last week, I wrote an article for our corporate weblog on the development of Java 7. Since the article was in Dutch, I didn’t post it on my personal blog. But I wanted to post some follow ups, and since it is not very easy to do this on the weblog of Finalist, I decided to translate the article to English and post it here. The translation is done pretty quickly, and thus very likely a bit rough on the edges. I think it is also interesting for non-Dutch readers. (more…)

Devoxx 2008: JavaFX, Java 7 and dynamic languages

Each year during the middle of December, the European Java community gathers at Antwerp to get updated on the latest developments in their profession. This year, Devoxx was organised for the first time from 8 until 12 December. The event was sold out for the second time in a row. This contradiction is caused by the fact that Devoxx until this year was known under the name JavaPolis, but due to a dispute with regards to the Java brand, the name was changed into Javox and finally to Devoxx. In this post I will give my impressions of two days of this event. A Dutch version of this post is available at the weblog of my employer. (more…)

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