package it.cast_01; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class FileOutputStreamDemo1 { public static void main(String[] args) { /* try { fos = new FileOutputStream("fos1.txt"); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { fos.write("Hello".getBytes()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { fos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }*/ // 一起如何做异常 /*try{ fos = new FileOutputStream("fos1.txt"); fos.write("Hello".getBytes()); fos.close(); }catch(FileNotFoundException e){ e.printStackTrace(); }catch(IOException e){ e.printStackTrace(); }*/ //改进版 // FileOutputStream fos = null; try{ fos = new FileOutputStream("fos1.txt"); fos.write("Hello".getBytes()); //当创建对象不成功时候,就不会执行close()方法 //fos.close(); }catch(FileNotFoundException e){ e.printStackTrace(); }catch(IOException e){ e.printStackTrace(); }finally{ //当创建对象成功时候,在执行close()方法。 if(fos!=null){ try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } } } }