以下程序的运行结果是 ____ public static void change(String str, char[] ch) { str = "test ok"; ch[0] = 'g'; } public static void main(String[] args) { String str = "good"; char[] ch = { 'a', 'b', 'c' }; change(str, ch); System.out.print(str + "and"); System.out.println(ch); }