TryFinally

来源：互联网发布：淘宝电脑卷转换手机卷编辑：程序博客网时间：2024/06/10 04:52

public class Demo7_TryFinally {

   public static void main(String[] args) throws IOException {
       //demo1();
       try(
       FileInputStream a =new FileInputStream("xxx.txt");
       FileOutputStream b =new FileOutputStream("yyy.txt");
       Myclose mc =new Myclose();
       ){
       int c ;
       while ((c=a.read()) !=-1) {
           b.write(c);

       }}



   }
//1.6版本之前的异常处理的标准格式
   public static void demo1() throws FileNotFoundException, IOException {
       FileInputStream a = null;
       FileOutputStream b =null;
       try{
       a =new FileInputStream("xxx.txt");
       b =new FileOutputStream("ccc.txt");
       int c;
       while ((c =a.read()) !=-1) {
           b.write(c);


       }
       }finally{
           try{if (a!=null){
               a.close();
           }                       //try finally 嵌套是能关一个是一个
           }finally{
               if (b!=null) {
                   b.close();
               }
           }


       }
   }

}

class Myclose implements AutoCloseable{

   public void close(){

       System.out.println("我关了");
   }
}

阅读全文

0 0