A really complicated way to do it in Java:
public class Closures02 {
public static void main(String[] args) {
 // no parameters, no statements
 System.out.println({ => "Hello World" }.invoke());
 // one parameter, no statements
 System.out.println({ String greeting => greeting + " " + "World" }.invoke("Hello"));
 // two parameters, no statements
 System.out.println({
  String greeting, String planet => greeting + " " + planet }.invoke("Hello", "World"));
 // no parameters, one statement
 System.out.println(
  { => System.out.print("Hello"); " " + "World" }.invoke());
 // one parameter, one statement
 System.out.println({
  String separator =>
   System.out.print("Hello"); separator + "World"}.invoke(" "));
 // two parameters, one statement
 System.out.println({
  String separator, String planet => System.out.print("Hello"); separator + planet
 }.invoke(" ", "World"));
}
}