下列程序的运行结果是______。 package ch1; import java.io. *; public class ex28 { public static void main (String args [] ) throws IOException { try { File f1 = new File('ch1//dir28'); f1.mkdir(); File f2 = new File(f1, 'file59.txt'); FileOutputStream fos = new FileOutputStream(f2); for(int i = 0; i < 2; i++) { String s= i + 'times'; byte[] b = s.getBytes(); fos.write(b,0,b.length); } } catch(IOException ioe) { ioe.printStackTrace(); } } }