java.io.FilterOutputStream.flush() 方法刷新此输出流并强制将所有缓冲的内容写入到流中。

声明

以下是java.io.FilterOutputStream.flush()方法声明：

public void flush()

参数

• NA

返回值

此方法不返回任何值。

异常

• IOException -- 如果发生I/ O错误..

例子

下面的示例演示java.io.FilterOutputStream.flush()方法的用法。

package com.yiibai;

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();
      }
   }
}

让我们编译和运行上面的程序，这将产生以下结果：

Character read: A