void close

描述

java.io.BufferedWriter.close() 方法刷新从流的字符，然后关闭它。关闭后，进一步的write（），append（）或flush（）调用将抛出IOException。

声明

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

public Writer close()

参数

NA

返回值

该方法没有返回值

异常

IOException − 如果发生I / O错误..

实例

以下示例显示了公共Writer close（）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;



      try{

         // create string writer

         sw = new StringWriter();



         //create buffered writer

         bw = new BufferedWriter(sw);



         // append character.

         bw.append("1");



         // close the writer

         bw.close();



         // print before appending one more character

         System.out.println(sw.getBuffer());



         // appending after closing will throw error

         bw.append("2");



         // print after appending one more character

         System.out.println(sw.getBuffer());



      }catch(IOException e){

         // if I/O error occurs

         System.out.print("Cannot append, buffered writer is closed");

      }finally{

         // releases any system resources associated with the stream

         if(sw!=null)

            sw.close();

         if(bw!=null)

            bw.close();

      }

   }

}

让我们编译并运行上面的程序，这将产生以下结果

1

Cannot append, buffered writer is closed