java.io.BufferedWriter.flush() 方法自刷新写缓冲区的字符的字符或字节流作为预定的目的地。

声明

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

public Writer 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.BufferedWriter.flush()方法的用法。

package com.yiibai;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.StringWriter;

public class BufferedWriterDemo {
   public static void main(String[] args) throws IOException {
      
      StringWriter sw = null;
      BufferedWriter bw = null;
      String letters = "ABCDEFGHIJK";
      
      try{
         // create string writer
         sw = new StringWriter();
         
         //create buffered writer
         bw = new BufferedWriter(sw);
         
         // for each character in the string
         for (char c: letters.toCharArray())
         {
            
            // append character to the writer
            bw.append(c);
            
            // flush the characters to the intended stream
            bw.flush();
            
            // print string buffer from string writer
            System.out.println(sw.getBuffer());
         }
      }catch(IOException e){
         // if I/O error occurs
         e.printStackTrace();
      }finally{
         // releases any system resources associated with the stream
         if(sw!=null)
            sw.close();
         if(bw!=null)
            bw.close();
      }
   }
}

让我们来编译和运行上面的程序，这将产生以下结果：

A
AB
ABC
ABCD
ABCDE
ABCDEF
ABCDEFG
ABCDEFGH
ABCDEFGHI
ABCDEFGHIJ
ABCDEFGHIJK