Java.io.BufferedWriter.flush()方法範例


 java.io.BufferedWriter.flush() 方法自重新整理寫緩衝區的字元的字元或位元組流作為預定的目的地。

宣告

以下是java.io.BufferedWriter.flush()方法的宣告

public Writer flush()

引數

  • NA

返回值

此方法不返回任何值。

異常

  • IOException -- -- 如果發生I/O錯誤.

例子

下面的範例演示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();
      }
   }
}

讓我們來編譯和執行上面的程式,這將產生以下結果:

A
AB
ABC
ABCD
ABCDE
ABCDEF
ABCDEFG
ABCDEFGH
ABCDEFGHI
ABCDEFGHIJ
ABCDEFGHIJK