下列程序执行后的结果是______。 package ch1; import java.io.*; public class ex22 { static, String filename = 'ch1/kfile22.txt'; public static void main(String[] args) { try { FileWriter fr = new FileWriter(filename); PrintWriter pr = new PrintWriter(fr); String name = 'xiaoming'; String phone = '123456'; String age = '12'; pr.println(name + ',' + phone + ',' + age); pr.close(); fr.close(); } catch(IOException ioe) { ioe.printStackTrace() } } }