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class Tester {            void test(Object s)    { System.out.println ("Object version");    }            void test(Tester s)    { System.out.println ("Tester version");    }            void test(SubTester s) { System.out.println ("SubTester version"); }                         // Not compilable any more if you uncomment the line             // since String and Tester are siblings            // void test(String s) { System.out.println ("String version"); }                          public static void main (String args[]) {            Tester c = new Tester ();            // Ambiguous, the most specific one which fit will be call            c.test (null);         // SubTester version             c.test (new Object()); // Object version             }            }                         class SubTester extends Tester{            }