单选题

下列java程序的输出结果为____。

Question

下列java程序的输出结果为____。

public class Example{
    String str=new String("hello")
    char[]ch={'a','b'}
    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]='c'
    }
}

A. hello and ab

B. hello and cb

C. hello and a

D. test ok and ab

E. test ok and cb

F. test ok and c