Java IOException

package io.filewriter;import java.io.FileWriter;import java.io.IOException;public class IOExceptionDemo {private static final String LINE_SRPATATOR = System.getProperty("line.separator");public static void main(String[] args)  {FileWriter fw=null;try {fw=new FileWriter("k:\\demo.txt");fw.write("xixi");fw.write(LINE_SRPATATOR);fw.write("aaaa");} catch (IOException e) {System.out.println(e.toString());}/* * 关闭流 关闭资源 在关闭前会调用flush刷新缓冲中的数据到目的地 */finally {if(fw!=null)//防止空指针异常 try {fw.close();} catch (IOException e) {throw new RuntimeException("关闭失败");}}}}