下列程序什么时候会抛出IOException? import java.io.*; class Test{ public static void main(String args[]){ try{ String strString = "Now is time to take Sun Cerfification"; char buffer[] = new char[strString.length()]; strString.getChars(0,strString.length(),buffer,0); FileWriter f = new FileWriter("MyFile1.txt"); FileWriter f1 = f; f1.close(); for(int i=0; i