指出下列程序运行的结果 ( ) public class Example{ String str=new String('good'); char[]ch={'a','b','c'}; public static void main(String args[]){ Example ex=new Example(); ex.change(ex.otr,ex.ch); System.out.print(ex.str+'and'); System.out.print(ex.ch); } public void change(String str,char ch[])} str='test ok'; ch[0]≈'g'; } }