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.str,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'; } }