(6-9)请阅读程序,写出程序运行结果。 class Phone{ private String name ; private int price ; public Phone(String name , int price ) { this . name = name ; this . price = price ; } public String toString() { return "" + this . price ; } } public class PhoneDemo { public static void main(String[] args ) { StringBuffer sb = new StringBuffer(); Phone [] list = new Phone[3]; list [0]= new Phone( " 华为 " ,3000); list [1]= new Phone( " 小米 8" ,4000); list [2]= new Phone( "vivo R10" ,2300); for (Phone p : list ) sb .append( p ); System. out .println( sb .toString()); } }