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POAndroid Generics Error: The method is not applicable for the arguments
 

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  1. POAndroid Generics Error: The method is not applicable for the arguments
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    <p>I'm developing an Android application and I'm using generics for a part of it. However I'm getting a compiler error that I'm unable to understand.</p> <p>I have the following architecture:</p> <pre><code>public interface IMakeableEncryptionBundle&lt;T, F&gt; { public void setConfigurationFactory(F configurationFactory); } public class VigEncryptionBundle implements IMakeableEncryptionBundle&lt;ITextContent, VigConfigurationFactory&gt; { @Override public void setConfigurationFactory(VigConfigurationFactory configFactory) { // Set the factory. } } public interface IConfigurationFactory { } public final class VigConfigurationFactory implements IConfigurationFactory { } </code></pre> <p>And I use it like this:</p> <pre><code>private IMakeableEncryptionBundle&lt; ITextContent, ? extends IConfigurationFactory&gt; encryptionBundle = new VigEncryptionBundle(); </code></pre> <p>And this is what causes the error:</p> <pre><code>VigConfigurationFactory configFactory = (VigConfigurationFactory) configObj; encryptionBundle.setConfigurationFactory(configFactory); </code></pre> <p><strong>"The method setConfigurationFactory(capture#8-of ? extends IConfigurationFactory) in the type IMakeableEncryptionBundle is not applicable for the arguments (VigConfigurationFactory)"</strong></p> <p>But isn't this exactly what "extends" is supposed to do? To allow you to use a subclass/implementation in place?</p> <p>Also neither this is working:</p> <pre><code>encryptionBundle.setConfigurationFactory((IConfigurationFactory) configFactory); </code></pre> <p><br><br> <strong>Edit:</strong> What I'm trying to achieve, is have an independency of the particular <code>IConfiguration</code> implementation and put the instantiation of <code>encryptionBundle</code> in an external class.</p> <p>At the same time I need generics to make sure a particular <code>IMakeableEncryptionBundle</code> implementation can use it's own <code>IConfiguration</code> implementation.</p> <p>In addition, the following as suggested below gives me another error:</p> <pre><code>private IMakeableEncryptionBundle&lt; ITextContent, IConfigurationFactory&gt; encryptionBundle = new VigEncryptionBundle(); </code></pre> <p><strong>"Type mismatch: cannot convert from VigEncryptionBundle to IMakeableEncryptionBundle"</strong></p> <p><br> I even tried to declare the following with no change:</p> <pre><code>public interface IMakeableEncryptionBundle&lt;T, F extends IConfigurationFactory&gt; </code></pre>
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    1. COI don't understand what you mean in your edit about making the code independent of a particular implementation and putting the instantiation of `encryptionBundle` in another class. Whatever line instantiates `encryptionBundle` is going to depend on the implementation. Do you mean, you want to be able to build an `IMakeableEncryptionBundle` in one class with the `VigConfigurationFactory` and then give it to another class that doesn't know about that particular factory?
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    2. COExactly, the class I'm using `encryptionBundle` in, should not know about the particular factory. And the one that instantiates it would be the external class. That's why I can't use `VigConfigurationFactory` here.
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    3. CODo you actually need the `F` type parameter at all, then? Why not just remove it and replace the instance of it in `setConfigurationFactory`'s signature with `IMakeableEncryptionBundle<ITextContent>`?
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