java字符串类型引用与字符类型引用的面试案例

public class Test3 {//4
String string=new String("good");//2
char[] ch={'a','b','c'};			//3
public static void main(String[] args){
Test3 test3=new Test3();//1
test3.change(test3.string,test3.ch);//5
System.out.println(test3.string+" and ");//8
System.out.println(test3.ch);	//9
}
private void change(String string, char[] ch) {
// TODO Auto-generated method stub
string="test ok";//6
ch[0]='g';//7
}
}

good and
gbc