Closures Basic Usage - UnquietCode/Closures-for-Java GitHub Wiki

public void inputTypes() {
	final String string = "hello";  // a final variable is accessible inside
	int X = 10;                     // not accessible, but can still be passed in
	final int dummyX = X;           // this will provide alternative access inside

	Closure1<Integer, Integer> adder = new AbstractClosure1<Integer, Integer>(X) {  // <-passing in a variable
		int x = this.<Integer>a1(); // will have to use this somtimes for some compilers
		int y = (Integer) a1();	    // this will work all of the time
		Integer z = a1();           // how it should always work, ideally
		int base = 12;              // of course, this always works

		public Integer run(Integer p1) {
			// access the final variables
			out(string + " " + dummyX);

			// can also get that X from the passed in variable
			out(string + " " + a1());

			// could look up by argument number instead of convenience method
			out(string + " " + arg(1));

			// or use our declared variables
			out(string + " " + x);
			out(string + " " + y);
			out(string + " " + z);

			// and we also get our parameter value
			out(string + " " + p1);

			// then we return an Integer
			return base + p1 + (Integer) a1() + x + y + z;
		}
	};

	// Now we can run it!
	out(adder.run(5));
}