Java Java.io.FilterOutputStream.flush() 方法

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  描述

  java.io.FilterOutputStream.flush()方法刷新此输出流，并强制将所有缓冲的内容写出到该流中。
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  声明

  以下是java.io.FilterOutputStream.flush()方法的声明-

   public void flush()

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  参数

  不适用
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  返回值

  此方法不返回任何值。
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  异常

  IOException如果发生I / O错误。
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  例子

  以下示例显示java.io.FilterOutputStream.flush()方法的用法。

   
  package com.jc2182;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.FilterOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  
  public class FilterOutputStreamDemo {
     public static void main(String[] args) throws Exception {
        OutputStream os = null; 
        FilterOutputStream fos = null;
        FileInputStream fis = null;
        int i = 0;
        char c;
        
        try {
           // create output streams
           os = new FileOutputStream("C://test.txt");
           fos = new FilterOutputStream(os);
  
           // writes byte to the output stream
           fos.write(65);
                    
           // forces byte contents to written out to the stream
           fos.flush();
           
           // create output streams
           fis = new FileInputStream("C://test.txt");
           
           // read byte
           i=fis.read();
           
           // convert integer to characters
           c = (char)i;
           
           // prints
           System.out.print("Character read: "+ c);
           
        } catch(IOException e) {
           // if any I/O error occurs
           System.out.print("Close() is invoked prior to write()");
        } finally {
           // releases any system resources associated with the stream
           if(os!=null)
              os.close();
           if(fos!=null)
              fos.close();
        }
     }
  }
  

  让我们编译并运行以上程序，这将产生以下结果-

   Close() is invoked prior to write()