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POstrange Java generics compilation error: parameterized method is not applicable for same parameterized types?
 

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  1. POstrange Java generics compilation error: parameterized method is not applicable for same parameterized types?
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    <p>I've stumbled across this error and I can't find the problem:</p> <pre><code>The method compute(Set&lt;String&gt;, Set&lt;String&gt;) in the type JaccardSimilarity&lt;String&gt; is not applicable for the arguments (Set&lt;String&gt;, Set&lt;String&gt;) </code></pre> <p>The method in question is using Generics: </p> <pre><code>public class JaccardSimilarity&lt;E&gt; implements SimilarityMeasure&lt;Set&lt;E&gt;, Set&lt;E&gt;&gt; { @Override public double compute(Set&lt;E&gt; s1, Set&lt;E&gt; s2){ // compute some stuff return unionSize == 0 ? 1 : intersectionSize / (double)unionSize; } } </code></pre> <p>I'm calling it in my class this way: </p> <pre><code>public MyClass { private JaccardSimilarity&lt;String&gt; sim = new JaccardSimilarity&lt;String&gt;(); public void calc() { Set&lt;String&gt; s1 = new HashSet&lt;&gt;(); s1.add("hallo welt"); Set&lt;String&gt; s2 = new HashSet&lt;&gt;(); s2.add("hallo welt"); // the line below throws the error.. double result = sim.compute(s1, s2); } </code></pre> <p>In my humble understanding of Java Generics this is perfectly valid code...</p> <p>How is this possible? </p> <p>Edit - Additional Code: </p> <pre><code>public interface SimilarityMeasure&lt;Q, R&gt; extends RelevanceFunction&lt;Q, R&gt; {} </code></pre> <p>and..</p> <pre><code>public interface RelevanceFunction&lt;Q, R&gt; { public double compute(Q v1, R v2); } </code></pre> <p>Edit 2: Here are the Imports: </p> <pre><code>import java.io.File; import java.io.IOException; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import org.codehaus.jackson.JsonNode; import org.codehaus.jackson.map.ObjectMapper; import &lt;redacted&gt;.JaccardSimilarity; </code></pre> <p>Edit 3: This was the error: </p> <pre><code>import &lt;redacted&gt;.representation.Set; </code></pre> <p>subtle...</p>
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    1. COCould you provide a minimal complete example that demonstrates the problem?
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    2. COYour import statements might be relevant.
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    3. COadded all other relevant classes and import statements. I'm not sure how to construct a single file example with abstract classes and interfaces. But with putting the code in sperate Files it should work.
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