Core Java

Date Util

Timezones suck. Especially daylight saving. I don’t mind moving the clock or losing an hour of sleep as much as the programming bugs related to that practice. The thing that sucks even more is Java’s old date/time API.
This was publicly acknowledged by the Java community with JSR 310 which replaced the Java Date & Time API’s however due to its complexity we still don’t have it yet. As a small workaround we created a small API to perform some common date calculations.

DateUtil allows you to check if a day is in the daylight saving era or if it isn’t. It works consistently on all platforms without a problem e.g.:

DateUtil du = new DateUtil();
Log.p("Currently in daylight savings time? "+du.inDaylightTime(new Date()));
Log.p("Offset: "+du.getOffset(new Date().getTime()));

Date dec30 = new Date(1483056000000l);
Log.p("Dec 30 is daylight savings time? "+du.inDaylightTime(dec30));
Log.p("Offset: "+du.getOffset(dec30.getTime()));

The DateUtil constructor can take a TimeZone as parameter. Without it, it uses the default TimeZone.

Completion Listeners

Media allows us to track whether it finished playing or not when we first set it up. After that point you were on your own.

Last week we added a new ability to bind a completion listener after the fact and potentially have multiple listeners:

MediaManager.addCompletionHandler(myMediaObject, () -> Log.p("This is a runnable callback"));

Partial Round

I’ve been working on improving this issue. The UI part isn’t there yet but the code is…​
The gist of it is that with the round rect border we currently have 3 options:

  • All corners should be rounded
  • Only the top corners
  • Only the bottom corners

The issue pointed out a use case for some of the corners and I can think of a case where I’d like the left or right corners rounded…​

With that in mind I decided the right thing to do is offer control over individual corners. This is possible only in code at the moment but would hopefully make it to the designer tool too at some point:

RoundRectBorder rb = RoundRectBorder.create().bottomLeftMode(false);

This would create a border whose corners are round except for the bottom left corner. While I was working on the class I also improved the performance/memory overhead of the border for solid colors.

Support for PATCH HTTP Request In Rest

The Rest class now supports the HTTP PATCH method which was missing from the API before. It’s not as common as other API’s so it went unnoticed for a while.

It works pretty much like every other Rest API request.

Published on Java Code Geeks with permission by Shai Almog, partner at our JCG program. See the original article here: Date Util

Opinions expressed by Java Code Geeks contributors are their own.

Shai Almog

Shai is the co-founder of Codename One, he has been programming professionally for over 20 years and developing in Java since 96. Shai worked for countless industry leaders including Sun Microsystems where he was a part of the original WTK (Wireless Toolkit) team & the co-creator of LWUIT. He worked with most major device operators/manufactures including Nokia, Samsung, Sony Ericson, Sprint, Vodafone, Verizon, NTT DoCoMo etc. Shai is a blogger and writer who often speaks at conventions. He is a Java One rockstar and top rated speaker for JavaZone, corporate conventions from Oracle, IBM and many others.
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6 years ago

which library will implement this?, java 8 don´t suport

6 years ago
Reply to  Christian

It’s a Codename One API

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