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POHow to make Joda work with String.format method (i.e. java.util.Formatter class)?
 

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  1. POHow to make Joda work with String.format method (i.e. java.util.Formatter class)?
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    <p>Is it possible to make an <code>org.joda.time.LocalDate.LocalDate</code> object work seamlessly with <code>String.format</code>? Here is a simple test case to illustrate what I'm trying to do:</p> <pre><code>public class JodaTests { @Test public void testLocalDateStringFormat() { final Logger logger = LoggerFactory.getLogger(JodaTests.class); //works, prints: 2012-06-01 logger.info(String.format("%s", new LocalDate())); //works, prints: 06/01/2012 logger.info(String.format("%1$tm/%1$td/%1$tY", new LocalDate().toDate())); //throws java.util.IllegalFormatConversionException: m != org.joda.time.LocalDate logger.info(String.format("%1$tm/%1$td/%1$tY", new LocalDate())); } } </code></pre> <p>So clearly, I can call the <code>toDate</code> method to convert the <code>LocalDate</code> to a <code>java.util.Date</code>, which then works fine with <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Formatter.html" rel="nofollow">Formatter</a>. But is there a way to configure Joda and/or the JDK somehow to make the 3rd line I have there (the one that throws the exception) work? I have tried web searches, and also searched a bit through the Joda API but didn't see any obvious answer.</p> <p><strong>Clarification</strong>: I know about Joda's built-in formatting capabilities (via <code>DateTimeFormat</code>) but I specifically need to format a <code>LocalDate</code> with <code>String.format</code> due to some library code I'm using.</p> <p>It looks like there is some limited capability to do this by implementing the <code>Formattable</code> interface in your custom type as described in <a href="https://blogs.oracle.com/CoreJavaTechTips/entry/using_printf_with_customized_formattable" rel="nofollow">this article</a>. Unfortunately, <code>LocalDate</code> is a <code>final</code> class so I can't (easily) extend it to implement the interface. I guess a wrapper class is the only way to go. Or, of course, by using <code>%d</code> format strings then fetching each individual field (i.e. <code>LocalDate.getYear</code>), which isn't desirable in my case.</p>
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    1. PTQuestion
    1. USJeff Evans
    1. USJeff Evans
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      1. POHow to make Joda work with String.format method (i.e. java.util.Formatter class)?
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      1. VTUpMod
    1. COI still don't understand why you can't just use JODA's formatting code to get a `String` that you can then pass in to `String.format`.
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      1. POHow to make Joda work with String.format method (i.e. java.util.Formatter class)?
      1. USLouis Wasserman
    2. COThat will probably be what I end up doing. I'm using Spring Batch, which has built-in support for extracting fields from an output object (in my case, a complex class with many fields of varying types, including `LocalDate`s) and writing those values to a flat file with minimal configuration. However, it doesn't seem to work too well in practice (not only for this, but also formatting - in a consistent way - BigDecimals which may or may not be `null`). So I will probably just have to accumulate a bunch of `String`s and not use the Spring Batch formatted aggregator functionality.
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      1. POHow to make Joda work with String.format method (i.e. java.util.Formatter class)?
      1. USJeff Evans
 

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