Java Java.io.BufferedWriter.close() 方法

• 

  描述

  java.io.BufferedWriter.close()方法从流中清除字符，然后将其关闭。关闭后，进一步的write()，append()或flush()调用将引发IOException。
• 

  声明

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

  public Writer close()

• 

  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

  以下示例显示了public Writer close()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;
        
        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();
        }
     }
  }
  

  让我们编译并运行以上程序，这将产生以下结果：

   1
  Cannot append, buffered writer is closed