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POInvoking scala.Function.tupled() from Java
 

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    <p>I would like to express all of the following Scala code in Java:</p> <pre><code>object TupleDemo { val tuple = (3, "Hello, world! ") /** @return str replicated x times */ def foo(x: Int, str: String) = str * x val tupledFoo1 = (foo _).tupled // partially applied function val tupledFoo2 = Function.tupled(foo _) // desugared syntax for same partially applied function } object TupleDemoApp extends App { import TupleDemo._ println(tupledFoo1(tuple)) // Hello, world! Hello, world! Hello, world! println(tupledFoo2(tuple)) // Hello, world! Hello, world! Hello, world! } </code></pre> <p>This is as much as I could figure out for the Java equivalent:</p> <pre><code>import scala.Function1; import scala.Function2; import scala.Tuple2; import scala.collection.immutable.WrappedString; import scala.runtime.AbstractFunction2; public class JavaTupleDemo { /** @return str replicated x times */ static final Function2&lt;Integer, String, String&gt; foo = new AbstractFunction2&lt;Integer, String, String&gt;() { public String apply(Integer x, String str) { return new WrappedString(str).$times(x); } // perhaps the types for this method are incorrect? public Function1&lt;Tuple2&lt;Integer, String&gt;, String&gt; tupled(Tuple2 tuple2) { return null; // what to write here instead of null? } }; public static void main(String[] args) { // works: Invoke tupled function defined in Scala from Java using Tuple2 defined in Java Tuple2&lt;Object, String&gt; tuple = new Tuple2&lt;Object, String&gt;(3, "Hello, World! "); System.out.println(TupleDemo.tupledFoo1().apply(tuple)); // works: Invoke regular function defined in Java from Java System.out.println(JavaTupleDemo.foo.apply(3, "Hello, planet! ")); // stumped: Invoke tupled function defined in Java from Java using both the Scala and the Java Tuple2 instances } } </code></pre>
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