Java Java.io.BufferedWriter.flush()用法及代碼示例

描述

這個java.io.BufferedWriter.flush()方法將字符從寫入緩衝區刷新到字符或字節流作為預期目標。

聲明

以下是聲明java.io.BufferedWriter.flush()方法。

public Writer flush()

參數

NA

返回值

此方法不返回任何值。

異常

IOException- 如果發生 I/O 錯誤。

示例

下麵的例子展示了 java.io.BufferedWriter.flush() 方法的用法。

package com.tutorialspoint;

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();
      }
   }
}

讓我們編譯並運行上麵的程序，這將產生以下結果——

A
AB
ABC
ABCD
ABCDE
ABCDEF
ABCDEFG
ABCDEFGH
ABCDEFGHI
ABCDEFGHIJ
ABCDEFGHIJK