Java Java.io.BufferedWriter.flush() 方法

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  描述

  java.io.BufferedWriter.flush()方法将字符从写缓冲区刷新到字符或字节流，作为预期的目标。
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  声明

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

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

   
  package com.jc2182;
  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();
        }
     }
  }
  

  让我们编译并运行以上程序，这将产生以下结果-

   
  A
  AB
  ABC
  ABCD
  ABCDE
  ABCDEF
  ABCDEFG
  ABCDEFGH
  ABCDEFGHI
  ABCDEFGHIJ
  ABCDEFGHIJK