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