网易面试题 对String和java调用方法的考察

public class Example {    public static void main(String args[]){      String str=new String("good");        char[] chars={'a','b','c'};        Example example=new Example();        example.exchange(str,chars);        System.out.print(str+"and");        System.out.print(chars);    }    private void exchange(String str, char[] chars) {        str="test ok";        chars[0]='g';    }}‘

答案打印出goodandgbc