import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import java.util.function.Function;
import java.util.function.Consumer;
 
public class Main {
 
  public static void main(String[] args) throws Exception {
    ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript");
    Main m = new Main();
    engine.getContext().setAttribute("main", m, ScriptContext.ENGINE_SCOPE);
    engine.eval("function f(x) {return 42;} main.hey(f);", engine.getBindings(ScriptContext.ENGINE_SCOPE));
  }
 
  public String bar() {
    return "Hello World";
  }
 
  public void hey(Function<Integer, Integer> f) {}
}
 

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