public class Show {
    String str = new String ("good");
    char[] ch = {'a','b','c'};
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Show show = new Show();
        show.change(show.str, show.ch);
        System.out.print(show.str+" and ");
        System.out.print(show.ch);

    }
    public void change(String str,char ch[]){
        str = "test ok";
        ch[0] = 'g';
    }
}

 为什么运行的结果中str不是test ok 而是原来的good？

谢谢你！