public class Mapper {

    // Define an interface that each block will implement. Note that
    // we use java.lang.Object here so this will work with any class.
    interface MapBlock {
	    public Object[] run(Object[] list);
    }

    // Define our map method, which calls the methods declared in the 
    // MapBlock interface and returns the outcome. 
    public static Object[] map(MapBlock block, Object[] list) {
	    Object[] out = block.run(list);
	    return out;
    }

    // Define a main to test the idea.
    public static void main(String[] args) {

	  // Test arguments, lowercase 'foo' and 'bar'
	  Object[] objects = { new String("foo"), new String("bar") };

	  // Call the map function, passing an anonymous class implementing
	  // interface MapBlock containing the code we want to run.
	  Object[] new_list = 
	      map(new MapBlock() { 
		    public Object[] run(Object[] list) {
			  Object[] out = new Object[list.length];
			  for (int i = 0; i < list.length; i++) {
			      String str = (String)list[i];
			      // Create uppercase versions
			      out[i] = str.toUpperCase();
			  }
			  return out;
		    }
    	  }, objects); // end of MapBlock, second param objects
	
	// Test to see what our new Object array contains.
	System.out.println((String)new_list[0] + (String)new_list[1]);

    }
}

##</code><code>##

new interface-name () { class-body } // as in this node
-or-
new class-name ([argument-list]) { class-body } // as in the reply