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<TITLE>Serializing an Immutable Bean Property to XML (Java Developers Almanac Example)
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  <h3>e10. Serializing an Immutable Bean Property to XML</h3>

An immutable property is one where the value is supplied to the
constructor rather than through a setter method.  By default,
immutable properties are not persisted.  This example demonstrates how
to persist an immutable property called <code>prop</code>.



<pre>    // Create an object with an immutable property and set the value
    // of the immutable property in the constructor
    <font color="#0066ff"><i>MyClass3</i></font> o = new <font color="#0066ff"><i>MyClass3</i></font>(<font color="#0066ff"><i>123</i></font>);
    
    try {
        // Create the encoder
        XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream(
            new FileOutputStream(<font color="#0066ff"><i>"outfilename.xml"</i></font>)));
    
        // Specify to the encoder, the name of the property that is associated
        // with the constructor's parameter(s)
        String[] propertyNames = new String[]{<font color="#0066ff"><i>"prop"</i></font>};
        encoder.setPersistenceDelegate(<font color="#0066ff"><i>MyClass3</i></font>.class,
            new DefaultPersistenceDelegate(propertyNames);
    
        // Serialize the object into XML
        encoder.writeObject(o);
        encoder.close();
    } catch (FileNotFoundException e) {
    }
</pre>


<pre>    // This class defines an immutable property called prop.
    // The value of the immutable property is initialized
    import java.beans.*;
    public class <font color="#0066ff"><i>MyClass3</i></font> {
        int prop;
        // The constructor that initializes the immutable property prop
        public <font color="#0066ff"><i>MyClass3</i></font>(int prop) {
            this.prop = prop;
        }
    
        // The immutable property
        public int getProp() {
            return prop;
        }
    }
</pre>
Here is the XML data:

<pre>    &lt;?xml version="1.0" encoding="UTF-8"?&gt;
    &lt;java version="1.4.0" class="java.beans.XMLDecoder"&gt;
        &lt;object class="MyClass3"&gt;
            &lt;int&gt;123&lt;/int&gt;
        &lt;/object&gt;
    &lt;/java&gt;
</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e7. <a class="eglink" href="WriteXml.html?l=rel">
    Serializing a Bean to XML
</a>
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e8. <a class="eglink" href="ReadXml.html?l=rel">
    Deserializing a Bean from XML
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<br>

e9. <a class="eglink" href="MakeTrans.html?l=rel">
    Preventing a Bean Property from Being Serialized to XML
</a>
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        See also: 
<a class="eglink" href="/egs/java.beans/pkg.html?l=rel#Events">
    Events
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