假设 xxx.txt 文件中存了 1000 个汉字 , 下列程序运行后输出的结果是 ( ) public class Test { public static void main(String[] args) throws IOException { FileReader fr = new FileReader("xxx.txt"); FileWriter fw = new FileWriter("yyy.txt"); int count = 0; char[] arr = new char[1024]; int len; while((len = fr.read(arr)) != -1) { count++; fw.write(arr,0,len); } fr.close(); fw.close(); System.out.println(count); } }