(6-3)请阅读程序,写出程序运行结果。 class Person{ private String name ; private int age ; public Person(String name , int age ) { this . name = name ; this . age = age ; } public String getName() { return name ; } public void setName(String name ) { this . name = name ; } } class Group{ private Person per ; void update(Person per ,String name ){ per .setName( name ); } public void setPerson(Person per ){ this . per = per ; } public Person getPerson(){ return this . per ; } } public class Demo18 { public static void main(String[] args ) { Group group = new Group(); Person per = new Person( " " ,22); group .setPerson( per ); System. out .println( group .getPerson().getName()); group .update( per , " 猪八戒 " ); System. out .println( per .getName()); per .setName( " 沙和尚 " ); System. out .println( per .getName()); System. out .println( group .getPerson().getName()); } }