现有: 1. class Tree { 2. private static String tree = "tree "; 3. String getTree () { return tree; } 4. } 5. class Elm extends Tree { 6. private static String tree = "elm "; 7. public static void main (String [] args) { 8. new Elm() .go (new Tree()) ; 9. } 10. void go (Tree t) { 11. String s = t.getTree () +Elm.tree + tree + (new Elm() .getTree ()) ; 12. System.out.println (s) ; 结果为: