1，流的标准处理异常代码1.6版本及其以前

• try finally嵌套

public static void demo1() throws FileNotFoundException, IOException {

        FileInputStream fis = null;

        FileOutputStream fos = null;

        try {

            fis = new FileInputStream("xxx.txt");

            fos = new FileOutputStream("yyy.txt");

            

            int b;

            while((b = fis.read()) != -1) {

                fos.write(b);

            }

        }finally {

            try{

                if(fis != null)

                    fis.close();

            }finally {                            //try fianlly的嵌套目的是能关一个尽量关一个

                if(fos != null)

                    fos.close();

            }

        }

    }

 

2，流的标准处理异常代码1.7版本,

【1】原理

• 在try()中创建的流对象必须实现了AutoCloseable这个接口,如果实现了,在try后面的{}(读写代码)执行后就会自动调用,流对象的close方法将流关掉

• try close

    public static void main(String[] args) throws IOException {

        //demo1();

        try(

            FileInputStream fis = new FileInputStream("xxx.txt");

            FileOutputStream fos = new FileOutputStream("yyy.txt");

            MyClose mc = new MyClose();

        ){

            int b;

            while((b = fis.read()) != -1) {

                fos.write(b);

            }

        }

    }