java–IO流-異常處理機制

/*IO異常處理機制*/import java.io.*;              //匯入IO包class FileWriterDemo2 {public static void main(String[] args) {FileWriter fw = null;         //在try代碼塊之前定義fw確保在後面的try代碼塊中能識別fwtry{fw = new FileWriter("demo.txt");  //在此開闢記憶體空間對其初始化fw.write("傳智播客");}catch (IOException e)        //拋出寫入檔案的異常處理機制{System.out.println("catch: "+e.toString());}finally{try{if(fw!=null)fw.close();     //重新整理並關閉檔案操作}catch (IOException e)   //拋出關閉檔案的異常{System.out.println("catch: "+e.toString());}}}}